(5) Nonferrous blades and ferrous housing with one-half inch or
more design tip clearance; or
    (6) Blades of aluminum or magnesium alloy and a ferrous housing
with a nonferrous insert sleeve at the periphery of the impeller.

Sec.  154.2109  Vapor recovery and vapor destruction units.

    Paragraphs (a), (b), and (e) of this section apply only to
facilities collecting vapors of flammable, combustible, or non-high
flash point liquid cargoes.
    (a) The inlet to a vapor recovery unit that receives vapor that has
not been inerted, enriched, or diluted in accordance with 33 CFR
154.2107 must be fitted with a detonation arrester.
    (b) The inlet to a vapor destruction unit must--
    (1) Have a liquid seal that meets the requirements of paragraph (e)
of this section, except as specified by paragraph (b)(3) of this
section; and
    (2) Have two quick-closing stop valves installed in the vapor line.
One of them must be installed upstream of the detonation arrester
required by paragraph (c)(2) of this section. The quick-closing stop
valves must--
    (i) Close within 30 seconds after detection of a condition that
requires the closing of these two quick-closing stop valves by a
control component required by this subpart for a vapor control system
(VCS) with a vapor destruction unit;
    (ii) Close automatically if the control signal is lost;
    (iii) Have a local valve position indicator or be designed so that
the valve position is readily determined from the valve handle or valve
stem position; and
    (iv) If the valve seat is fitted with resilient material, be a
Category A valve as defined by 46 CFR 56.20-15 and not allow
appreciable leakage when the resilient material is damaged or
destroyed; and
    (3) Instead of a liquid seal as required by paragraph (b)(1) of
this section, have the following:
    (i) An anti-flashback burner accepted by the Commandant and
installed at each burner within the vapor destruction unit; and
    (ii) A differential pressure sensor that activates the quick-
closing stop valves as required by paragraph (b)(2) of this section
upon sensing a reverse flow condition.
    (c) A vapor destruction unit must--
    (1) Not be within 30 meters (98.8 feet) of any tank vessel berth or
mooring at the facility;
    (2) Have a detonation arrester fitted in the inlet vapor line; and
    (3) Activate an alarm that satisfies the requirements of 33 CFR
154.2100(e) and shut down when a flame is detected on the detonation
arrester.
    (d) When a vapor destruction unit shuts down or has a flame-out
condition, the vapor destruction unit control system must--
    (1) Activate and close the quick-closing stop valves required by
paragraph (b)(2) of this section;
    (2) Close the remotely operated cargo vapor shutoff valve required
by 33 CFR 154.2101(a); and
    (3) Automatically shut down any vapor-moving devices installed in
the VCS.
    (e) If a liquid seal is installed at the inlet to a vapor
destruction unit, then--
    (1) The liquid used in the liquid seal must be compatible with the
vapors being controlled;
    (2) For partially or totally soluble cargoes that can polymerize in
solution, there must be an adequate amount of inhibitor in the liquid
seal;
    (3) The liquid seal must be compatible with the design of the VCS
and must not contribute to the flammability of the vapor stream; and
    (4) The liquid seal must have a low-level alarm and a low-low level
shutdown.

Sec.  154.2110  Vapor balancing requirements.

    Paragraphs (a)(2) and (4), (b), and (c) of this section apply only
to facilities transferring vapors of flammable, combustible, or non-
high flash point liquid cargoes.

    (a) A vapor control system (VCS) that uses a vapor balancing system
in which cargo vapor is transferred from a vessel cargo tank or
facility storage tank through the facility vapor collection system to a
facility storage tank or vessel cargo tank must--
    (1) Have facility storage tank high-level alarm systems and
facility storage tank overfill control systems, independent of the
high-level alarm system, arranged to prevent the cargo from entering
the vapor return line;
    (2) Have a detonation arrester located within the storage tank
containment area and a detonation arrester located as close as
practicable to the facility vapor connection. The total pipe length
between the detonation arrester and the facility vapor connection must
not exceed 18 meters (59.1 feet) and the vapor piping between the
detonation arrester and the facility vapor connection must be protected
from any potential internal or external ignition source;
    (3) Meet the overpressure and over-vacuum protection requirements
of 33 CFR 154.2103; and
    (4) As an alternative to paragraph (a)(2) of this section, inert
cargo systems can meet the requirements of 33 CFR 2105(a)(1).
    (b) A vapor balancing system, while in operation to transfer vapor
to or from a vessel cargo tank and connected by way of the facility
storage tank vent to a facility's main VCS with a vapor destruction
unit, must have--
    (1) A means to prevent backflow of vapor from the facility's main
VCS to the marine vapor line; and
    (2) Two fail-safe, quick-closing valves installed in the marine
vapor line at the facility storage tank that automatically close when--
    (i) Flame is detected on the facility storage tank; or
    (ii) The temperature of the facility storage tank's vapor space
reaches 177[deg]C (350[emsp14][deg]F) or 70 percent of the vapor's
auto-ignition temperature in degrees Celsius, whichever is lower.
    (c) Transferring vapor from a non-inerted facility storage tank to
a vessel cargo tank that is required to be inerted in accordance with
46 CFR 32.53, 153.500, or Table 151.05, is prohibited.
    (d) A vapor balancing system that transfers vapor to a vessel cargo
tank must not use a vapor-moving device to assist vapor transfer or
inject inerting, enriching, or diluting gas into the vapor line without
approval from the Commandant.

Sec.  154.2111  Vapor control system connected to a facility's main
vapor control system.

    (a) When a marine vapor control system (VCS), or a marine vapor
collection system, is connected to a facility's main VCS serving other
facility processing areas that are not related to tank vessel
operations, the marine vapor line, before the point where the marine
VCS connects to the facility's main VCS, must be fitted with--
    (1) A detonation arrester, unless both the marine VCS and the
facility's main VCS only control vapors of cargoes that are non-
flammable, non-combustible, or that have high flashpoints;
    (2) Two fail-safe, quick closing valves, one on each side of any
detonation arrester required by paragraph (a)(1) of this section, which
automatically close when--
    (i) A flame is detected on the detonation arrester;
    (ii) The facility's marine VCS is not in operation; or
    (iii) Vapor back flow to the marine vapor line is detected; and
    (3) A means to prevent backflow of vapors to the marine vapor line.
    (b) Vapors from facility processing areas unrelated to tank vessel
operations must not enter the vapor line of a marine VCS before the
devices required by paragraph (a) of this section.
    (c) Except as specified by paragraph (d) of this section, a
facility that wants to connect a facility vapor line, which collects
vapor from other facility processing areas that are not related to tank
vessel operations, to a marine VCS before the devices required by 33
CFR 154.2109(b)(1) and (2) and (c)(2), must receive approval in writing
from the Commandant.
    (d) A facility may connect a facility vapor line, which collects
vapor from other facility processing areas that are not related to tank
vessel operations, to a marine vapor line downstream of the devices
required by 33 CFR 154.2109(b)(1) and (2) and (c)(2) to share the
marine vapor destruction unit.

Sec.  154.2112  Vapors with potential to polymerize or freeze--special
requirements.

    (a) A vapor control system (VCS) that controls vapors with the
potential to polymerize at a normal ambient condition must--
    (1) Be designed to prevent condensation of monomer vapor. Methods
such as heat tracing and insulation are permitted if they do not result
in an increased risk of polymerization;
    (2) Be designed so that polymerization can be detected. Any points
suspected of being sites for potential polymerization buildup must be
equipped with inspection openings; and
    (3) Include devices to measure the pressure drop across detonation
arresters due to polymerization. The devices should activate an alarm
on high pressure drop to warm of polymerization. Any device used for
this purpose, including differential pressure monitors, must not have
the capability of transmitting a detonation across the detonation
arrester.
    (b) A VCS that controls cargo vapors that potentially freeze at
ambient temperature must have a design that prevents the freezing of
vapors or condensate at ambient temperature or that detects and removes
the liquid condensate and solids to prevent accumulation.

Sec.  154.2113  Alkylene oxides--special requirements.

    A vapor control system (VCS) that controls vapors of an alkylene
oxide, except for carriage under 46 CFR part 151 (listed in Table
151.05 with ``Pressure'' entry in the ``Cargo identification, Pressure,
b'' column), must comply with paragraphs (a) and (b) of this section.
    (a)(1) The VCS's equipment, hoses, piping, and all piping
components, including valves, flanges, and fittings, must be of a type
and constructed out of materials suitable for use with alkylene oxide;
    (2) The VCS used for collecting an alkylene oxide vapor must not be
used for collecting other vapors and must be separated from any other
VCS, except as specified by paragraph (b) of this section; and
    (b) The VCS must be adequately cleaned in accordance with 33 CFR
154.2150(p) and either recertified by a certifying entity or approved
by a marine chemist if--
    (1) The VCS is used to control other vapors; or
    (2) The VCS is returned to alkylene oxide service after being used
to control other cargo vapors.

Transfer Facilities--Operations

Sec.  154.2150  General requirements.

    (a) No transfer operation using a vapor control system (VCS) may be
conducted unless the facility operator has a copy of the facility
operations manual, with the VCS addendum, marked by the local Coast
Guard Captain of the Port (COTP) as required by 33 CFR 154.325(d).
    (b) Personnel in charge of a facility must ensure that--
    (1) The facility controls vapor only from cargoes that are properly
authorized for vapor control in the facility's certification letter;

    (2) The facility transfers vapor only to or from a vessel that has
its certificate of inspection or certificate of compliance endorsed in
accordance with 46 CFR 39.1013 or 46 CFR 39.1015 for each cargo
intended for transfer; and
    (3) If the vessel tanks to be vapor controlled contain vapor from
previous cargo transfers other than the cargo or cargoes intended for
transfer, the facility and vessel must be authorized to control the
additional vapor from the previous cargo transfers. Any oxygen or
hydrocarbon analyzer alarm and shutdown setpoints must be set to
accommodate all of the cargo vapors.
    (c) The facility personnel in charge must ensure that safety system
testing is conducted as follows:
    (1) Pressure sensors, alarms, and automatic shutdown systems
required by 33 CFR 154.2103, 154.2107, and 154.2110, except as exempted
by paragraph (c)(2) or specified by paragraph (c)(3) of this section,
must be tested by applying altering test pressures at the sensors not
more than 24 hours before each transfer;
    (2) The pressure sensors required by 33 CFR 154.2103 may meet the
requirements of the test program contained in 33 CFR 154.2180 and 33
CFR 154.2181 instead of the current program, which mandates tests
within 24 hours before each transfer as required by paragraph (c)(1) of
this section;
    (3) Visible and audible alarm indicators must be tested not more
than 24 hours before each transfer;
    (4) The analyzers, except for flammability analyzers, required by
33 CFR 154.2105, 154.2107, and 154.2110, except as exempted by
paragraph (c)(5) of this section, must be checked for calibration
response by using a zero gas and a span gas not more than 24 hours
before each transfer;
    (5) The analyzers required by 33 CFR 154.2105, 154.2107, and
154.2110 may be checked for calibration response by use of a zero gas
and a span gas as defined by the test program contained in 33 CFR
154.2180 and 33 CFR 154.2181, and comply with the minimum requirements
as defined in 33 CFR 154.2180 and 33 CFR 154.2181, instead of the test
required by paragraph (c)(4) of this section; and
    (6) The vacuum and pressure relief valves required by 33 CFR
154.2103 must be manually checked per manufacturers' instructions to
verify that the valves unseat easily and then reset to the closed
position without constraint. Any required flame screens or flame
arresters must also be visually checked to ensure that they are not
damaged.
    (d) The proper position of all valves in the vapor line between the
vessel's tanks and the facility vapor collection system must be
verified before the start of the transfer operation.
    (e) A tank barge overfill control system that meets the
requirements of 46 CFR 39.2009(a)(2) must--
    (1) Not be connected to an overfill sensor circuit that exceeds the
system's rated inductance and capacitance; and
    (2) Be tested for proper operation after connection is made with
the vessel by simulating liquid high level and overfill at each tank.
    (f) When receiving vapor from a vessel with cargo tanks that are
required to be inerted in accordance with 46 CFR 32.53, 46 CFR 153.500,
or 46 CFR Table 151.05, the remotely operated cargo vapor shutoff valve
required by 33 CFR 154.2101(a) must not be opened until the pressure at
the facility vapor connection, downstream of the facility vapor
connection, exceeds 0.2 pounds per square inch gauge (psig).
    (g) The initial cargo transfer rate must not exceed the rate agreed
upon at the pre-transfer conference and 46 CFR 39.3001(g).
    (h) The cargo transfer rate must not exceed the maximum allowable
transfer rate as determined by the lesser of the following:
    (1) A transfer rate corresponding to the maximum vapor processing
rate for the VCS, as specified in the facility operations manual; or
    (2) The vessel's maximum transfer rate in accordance with 46 CFR
39.3001(d).
    (i) While transferring cargo to a vessel connected to a VCS,
compressed air or gas may be used to clear cargo hoses and loading
arms, but must not be used to clear cargo lines. However, compressed
inert gas such as nitrogen can be used to clear cargo lines if a
pigging system that meets 33 CFR 154.2104 is provided.
    (j) If a pigging system is used to clear cargo lines to the tank
vessel while the vessel is connected to the facility VCS, the following
operational requirements apply:
    (1) The VCS must be in operation, with all of the high-pressure
alarms and shutdowns required by 33 CFR 154.2103 active, before and
during pigging operations;
    (2) Personnel performing the pigging operation must be adequately
trained on the specific pigging system being used. Accurate written
procedures that address event sequence, equipment, safety precautions,
and overpressurization hazards must be made available to all personnel
involved in the pigging operations;
    (3) Pigging procedures must be reviewed by both the vessel and
facility personnel in charge as part of the pre-transfer conference.
Topics of discussion during the pre-transfer conference must include,
but need not be limited to--
    (i) Event sequence;
    (ii) Equipment;
    (iii) Safety precautions;
    (iv) Overpressurization hazards;
    (v) Personnel roles;
    (vi) Gas volumetric flow rates;
    (vii) Gas pressures;
    (viii) Volume of residual cargo in the line;
    (ix) Amount of ullage space that is available for line displacement
and connections;
    (x) Valve alignment;
    (xi) Units of measure;
    (xii) Terminology; and
    (xiii) Anticipated duration of the evolution;
    (4) The pig must be inspected to ensure that it is of sufficient
durability and condition; be of an appropriate size, type, and
construction for the intended operation; and be inspected for defects
before each use and replaced if necessary;
    (5) Personnel performing pigging operations must monitor pig
movement at all times. The facility and vessel manifold valves must be
closed immediately after the pig reaches the pig-receiving device; and
    (6) If the pigging system contains pressure-sensing, relieving, or
alarming components in addition to those required by 33 CFR 154.2103,
the components must be periodically tested in accordance with
paragraphs (c) and (q) of this section.
    (k) If one or more analyzers required by 33 CFR 154.2107(d) or (e)
or 154.2110 become inoperable during a transfer operation, the
operation may continue, provided that at least one analyzer remains
operational; however, no further transfer operations may start until
all inoperable analyzers are replaced or repaired.
    (l) Whenever a condition results in a shutdown of the VCS, the
emergency shutdown system required by 33 CFR 154.550 must be
automatically activated to terminate cargo loading into tanks which are
being vapor controlled.
    (m) If it is suspected that a flare in the VCS has had a flashback,
or if a flame is detected on a detonation arrester required by 33 CFR
154.2109(c)(2), the transfer operation must stop and cannot restart
until that detonation arrester and any quick-closing stop valves
downstream of the detonation arrester are inspected and found to be in
satisfactory condition.

    (n) Before each transfer operation, the freezing point of each
cargo must be determined. If there is a possibility that the ambient
air temperature during transfer operations will be at or below the
freezing point of the cargo, adequate precautions must be taken to
prevent freezing of vapor or condensate, or to detect and remove the
frozen liquid and condensation to prevent accumulation.
    (o) Before each transfer operation, the cargo vapor must be
evaluated to determine its potential to polymerize, and adequate
precautions must be taken to prevent and detect polymerization of the
cargo vapors.
    (p) Mixing of incompatible vapors is prohibited. The VCS piping,
equipment, hoses, valves, and arresters must be purged between vapor
control operations that involve incompatible chemical vapors in
accordance with the following:
    (1) Chemical compatibility must be determined by using the
procedures contained in 46 CFR part 150;
    (2) Purge gas must be an inert gas, air, or enriching gas, and must
be adequate to reduce the level of residual vapor to a level at which
reaction with the subsequent vapor cannot occur; and
    (3) The required duration of purge time must be calculated and
approved by the certifying entity during the certification or
recertification.
    (q) After each transfer operation, the VCS piping, equipment,
hoses, valves, and arresters must be purged with at least two-system
volume exchanges of non-reactive gas or air so the VCS is left with a
safe condition.
    (r) VCS equipment and instrumentation must be tested in compliance
with 33 CFR 156.170(g) or (i), with the COTP or designated
representative invited to observe these tests. The test procedure and a
checklist must be approved by the certifying entity during the initial
certification of the system and incorporated into the facility
operations manual.
    (s) A transfer operation that includes collection of vapor emitted
to or from a vessel's cargo tanks must meet the transfer requirements
of 33 CFR 156.120(aa), and a declaration of inspection meeting the
requirements of 33 CFR 156.150 must be completed before each transfer.

Alternative Analyzer and Pressure Sensor Reliability Testing

Sec.  154.2180  Alternative testing program--generally.

    (a) As an alternative to complying with the vapor control system
(VCS) analyzer and pressure sensor safety testing requirements provided
by 33 CFR 154.2150(c) and 33 CFR 154.2250(c), the facility person in
charge may administer a reliability assurance test program in
accordance with this section and 33 CFR 154.2181.
    (b) As used in this section--
    (1) Calibration drift or CD means the difference in the analyzer
output readings from the established reference value after a stated
period of operation during which no unscheduled maintenance, repair, or
adjustment took place;
    (2) Calibration error or CE means the difference between the gas
concentration exhibited by the gas analyzer and the known concentration
of the cylinder gas;
    (3) Response time or RT means the time interval between the start
of a step change in the system input (e.g., change of calibration gas)
and the time when the data recording system displays 95 percent of the
final stable value; and
    (4) Sampling system bias or SSB means the difference between the
gas concentrations indicated by the measurement system when a known
cylinder gas is introduced at or near the sampling probe and when the
same gas is introduced directly to the analyzer.
    (c) All analyzers used in a VCS must be tested for safety system
functions, CE, CD, RT, and SSB, in accordance with 33 CFR 154.2181.
    (d) All pressure sensors/switches used in a VCS must be tested for
safety system functions, CE and CD, in accordance with 33 CFR 154.2181.
    (e) The facility person in charge must ensure the following:
    (1) Calibration of instrumentation using standard procedures
provided by the manufacturer or service provider;
    (2) Monitoring of all interlocks, alarms, and recording devices for
proper operation while instrumentation is being calibrated;
    (3) Use of a certified gas standard that is within plus or minus
two (2) percent of its certified concentration to calibrate the
analyzers; and
    (4) Use of a certified secondary standard that is standardized
against a primary standard to calibrate the pressure sensors/switches.
    (f) Upon failing any test under 33 CFR 154.2181, the facility
person in charge must ensure that all monthly and quarterly tests,
including CE, CD, RT, and SSB, are conducted; and until all quarterly
tests are completed, the person in charge must ensure that the vapor
control alarms and automatic shutdown system are tested no more than 24
hours prior to any transfer or tank barge cleaning operation.
    (g) Analyzers required by 33 CFR 154.2105(a) and (j) and
154.2107(d) and (e) must be checked for calibration using a zero gas
and a span gas.
    (h) The facility operator must maintain and make available upon the
request of the Commandant and the certifying entity that certifies the
VCS the following reliability assurance test program documents for two
years:
    (1) All test procedures;
    (2) The dates of all tests, type of tests made, and who conducted
the tests;
    (3) Results of the tests, including the ``as found'' and ``as
left'' conditions; and
    (4) A record of the date and time of repairs made.

Sec.  154.2181  Alternative testing program--test requirements.

    (a) The safety system function test required by 33 CFR 154.2180
must be performed once every two weeks and test for the proper
operation and interaction of the analyzer or pressure sensor/switch
with shutdown interlocks, and audible and visible alarm devices.
    (b) The calibration error (CE) test required by 33 CFR 154.2180
must be performed once every month and documented as shown in Forms
154.2181(b)(2) and 154.2181(b)(3) of this section, to document the
accuracy and linearity of the monitoring equipment for the entire
measurement range.
    (1) The CE test must expose the measurement system, including all
monitoring components (e.g., sample lines, filters, scrubbers,
conditioners, and as much of the probe as practicable), to the
calibration gases, introduced through an injection port located so as
to allow a check of the entire measurement system when calibration
gases are introduced;
    (2) The CE test must check the calibrated range of each analyzer
using a lower (zero) and upper (span) reference gas standard. Three
measurements must be taken against each standard and recorded as shown
in Form 154.2181(b)(2) of this section, with the average of the three
values in each case then used to calculate the CE according to this
equation (where CE = percentage calibration error based upon span of
the instrument, R = reference value of zero or high-level calibration
gas introduced into the monitoring system, A = actual monitoring system
response to the calibration gas, and S = span of the instrument):
[GRAPHIC] [TIFF OMITTED] TR16JY13.001

Form 154.2181(b)(2): Calibration error determination.

----------------------------------------------------------------------------------------------------------------
                                                                                Difference
                                                    Calibration       Monitor    -------------------------------
                                                       value         response          Zero            Span
----------------------------------------------------------------------------------------------------------------
1-Zero..........................................
----------------------------------------------------------------------------------------------------------------
1-Span..........................................
----------------------------------------------------------------------------------------------------------------
2-Zero..........................................
----------------------------------------------------------------------------------------------------------------
2-Span..........................................
----------------------------------------------------------------------------------------------------------------
3-Zero..........................................
----------------------------------------------------------------------------------------------------------------
3-Span..........................................
----------------------------------------------------------------------------------------------------------------
                                Mean Difference =
                                                                                -------------------------------
                               Calibration Error =                                             %               %
                                                                                -------------------------------
----------------------------------------------------------------------------------------------------------------

    (3) The CE test must check each pressure sensor/switch for upscale
(activate) and downscale (deactivate) hysteresis around the sensor/
switch set pressure. The calibration error must be calculated and
recorded as shown in Form 154.2181(b)(3) of this section. Test the
pressure sensor/switch three times and record the desired setting and
the as-found set pressure. Calculate and record the difference of the
two settings. Calculate the error percentage using this equation (where
CE = percentage calibration error based upon span of the instrument, R
= reference setting of the instrument, A = actual response as recorded
on the test instrument, and S = span of the instrument):
[GRAPHIC] [TIFF OMITTED] TR16JY13.002

Record sensor ``as-left'' setting only if an adjustment is made.

[GRAPHIC] [TIFF OMITTED] TR16JY13.003

    (c) The calibration drift (CD) test required by 33 CFR 154.2180
must be performed once every quarter and documented as shown in Form
154.2181(c)(3) of this section, to verify

the ability of the instrument to conform to the established
calibration.
    (1) The CD measurement must be conducted once daily for 7
consecutive days without making any adjustments to the instruments.
    (2) Conduct the CD test at zero level (between 0 and 20 percent of
the instrument span) and at high level (between 75 and 95 percent of
the instrument span).
    (3) Calculate and record the CD for 7 consecutive days using the
equations in paragraphs (b)(2) and (3) of this section and Form
154.2181(c)(3) of this section.

Form 154.2181(c)(3): Calibration drift determination.

----------------------------------------------------------------------------------------------------------------
                                                     Reference
               Day                   Day/time       value (RV)     Monitor value    Difference     Percent of RV
----------------------------------------------------------------------------------------------------------------
Low-Level:
----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------
High-Level:
----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------

    (d) The response time (RT) test required by 33 CFR 154.2180 must be
performed once every quarter and documented as shown in Form
154.2181(d) of this section, to determine the RT which is the largest
average response time in the upscale or downscale direction.
    (1) For systems that normally operate below 20 percent of
calibrated range, only a span (upscale) test is required.
    (2) Record the span (upscale) value, zero (downscale) cylinder gas
value, and stable, initial process-measured variable value.
    (3) Determine the step change, which is equal to the average
difference between the initial process-measured variable value and the
average final stable cylinder gas-measured value.
    (4) To determine both upscale and downscale step change intervals--
    (i) Inject span (or zero) cylinder gas into the sample system as
close to the sample probe as possible. Existing systems that inject the
gas at the analyzer box do not need to be modified. However, the gas
transit time between the analyzer box and the sample probe must be
taken into account;
    (ii) Allow the analyzer to stabilize and record the stabilized
value. A stable reading is achieved when the concentration reading
deviates less than 6 percent from the measured average concentration in
6 minutes or if it deviates less than 2 percent of the monitor's span
value in 1 minute;
    (iii) Stop the span (or zero) gas flow, allow the monitor to
stabilize back to the measured variable value, and record the
stabilized value; and
    (iv) Repeat this procedure a total of three times and subtract the
average final monitor reading from the average starting monitor value
to determine the average upscale (or downscale) step change.
    (5) Determine the response time, which is equal to the elapsed time
at which 95 percent of the step change occurred.
    (i) To find this value, take 5 percent of the average step change
value and subtract the result from the cylinder gas analyzed value as
shown in the following equation:

95% step change value = cylinder gas value - (0.05 x avg. step change)
    (ii) Inject span (or zero) cylinder gas into the sample system as
close to the sample probe as possible, and measure the time it takes to
reach the 95 percent step change value.
    (iii) Repeat the previous step (paragraph (d)(5)(ii) of this
section) a total of three times each with span and zero cylinder gas to
determine average upscale and downscale response times.
    (iv) Compare the response times achieved for the upscale and
downscale tests. The longer of these two times equals the response time
for the analyzer.

[GRAPHIC] [TIFF OMITTED] TR16JY13.004

    (e) The sample system bias (SSB) test required by 33 CFR 154.2180
must be performed once every quarter and documented, to establish that
the system has no additional influence on the measurement being made by
the analyzer.
    (1) Conduct a close CE test in accordance with paragraph (b) of
this section, by injecting calibration gas as close as possible to the
analyzer, eliminating as much of the sample system components as
possible, while still simulating the normal source operating
conditions.
    (2) If system integrity is maintained, and it has not become
contaminated, the difference between the close and standard CE tests
should be the same.
    (f) For CE and CD tests, analyzers and pressure sensors must meet
the following minimum compliance requirements:
    (1) Oxygen analyzers must not deviate from the reference value of
the zero- or high-level calibration gas by more than 0.5 percent of
full scale;
    (2) Total hydrocarbon analyzers must not deviate from the reference
value of the zero- or high-level calibration gas by more than 1 percent
of full scale; and
    (3) Pressure sensors/switches must not deviate from the reference
value of the zero- or high-level calibration gas by more than 1.5
percent of full range.
    (g) For RT tests, each oxygen or hydrocarbon analyzer must respond,
in less than 1 minute, to 95 percent of the final stable value of a
test span gas.
    (h) For SSB tests, the analyzer system bias must be less than 5
percent of the average difference between the standard CE test and the
close CE test, divided by the individual analyzer span.

Tank Barge Cleaning Facilities--VCS Design and Installation

Sec.  154.2200  Applicable transfer facility design and installation
requirements.

    A tank barge cleaning facility's (TBCF's) vapor control system
(VCS) must meet the following design and installation requirements of
this subpart for a transfer facility's VCS:
    (a) 33 CFR 154.2100(b), (c), (f), (g), (i), (j), and (k): general
design and installation requirements;
    (b) 33 CFR 154.2102: facility requirements for vessel liquid
overfill protection, if a TBCF receives vapor from a tank barge that is
required by 46 CFR 39.6001(f)(3) to be equipped with a liquid overfill
protection arrangement and meet 46 CFR 39.2009;
    (c) 33 CFR 154.2106: detonation arrester installation;
    (d) 33 CFR 154.2107: inerting, enriching, and diluting systems;

    (e) 33 CFR 154.2108: vapor-moving devices;
    (f) 33 CFR 154.2109: vapor recovery and vapor destruction units;
    (g) 33 CFR 154.2111: VCS connected to a facility's main VCS;
    (h) 33 CFR 154.2112: special requirements for vapors with the
potential to polymerize or freeze; and
    (i) 33 CFR 154.2113: special requirements for alkylene oxides.

Sec.  154.2201  Vapor control system--general requirements.

    (a) Vapor control system (VCS) design and installation must
eliminate potential overpressure and vacuum hazards, sources of
ignition, and mechanical damage to the maximum practicable extent. Each
remaining hazard source that is not eliminated must be specifically
addressed in the protection system design and system operational
requirements.
    (b) Any pressure, flow, or concentration indication required by
this part must provide a remote indicator on the facility where the VCS
is controlled, unless the local indicator is clearly visible and
readable from the operator's normal position at the VCS control
station.
    (c) Any condition requiring an alarm as specified in this part must
activate an audible and visible alarm where the VCS is controlled.
    (d) A mechanism must be developed and used to eliminate any liquid
from the VCS.
    (e) A liquid knockout vessel must be installed between the facility
vapor connection and any vapor-moving device in systems that have the
potential for two-phase (vapor/liquid) flow from the barge or the
potential for liquid condensate to form as a result of the enrichment
process. The liquid knockout vessel must have--
    (1) A means to indicate the level of liquid in the device;
    (2) A high liquid level sensor that activates an alarm that
satisfies the requirements of 33 CFR 154.2100(e); and
    (3) A high-high liquid level sensor that closes the remotely
operated cargo vapor shutoff valve required by 33 CFR 154.2101(a) and
shuts down any vapor-moving device before liquid is carried over to the
vapor-moving device. One sensor with two stages may be used to meet
this requirement as well as paragraph (e)(2) of this section.

Sec.  154.2202  Vapor line connections.

    (a) 33 CFR 154.2101(a), (e), and (g) apply to a tank barge cleaning
facility's (TBCF's) vapor control system (VCS).
    (b) The remotely operated cargo vapor shutoff valve required by 33
CFR 154.2101(a) must be located upstream of the liquid knockout vessel
required by 33 CFR 154.2201(e).
    (c) A fluid displacement system must have a remotely operated
shutoff valve installed in the fluid injection supply line between the
point where the inert gas or other medium is generated and the fluid
injection connection. The valve must comply with 33 CFR 154.2101(a)(1)
through (6).
    (d) Each hose used for transferring vapors must--
    (1) Have a design burst pressure of at least 25 pounds per square
inch gauge (psig);
    (2) Have a maximum allowable working pressure (MAWP) no less than 5
psig;
    (3) Be capable of withstanding at least the maximum vacuum rating
of the vapor-moving device without collapsing or constricting;
    (4) Be electrically continuous, with a maximum resistance of 10,000
ohms;
    (5) Have flanges with a bolthole arrangement complying with the
requirements for Class 150 ANSI B16.5 flanges (incorporated by
reference, see 33 CFR 154.106);
    (6) Be abrasion and kinking resistant; and
    (7) Be compatible with vapors being transferred.
    (e) Fixed vapor collection arms must meet the requirements of
paragraph (d) of this section.

Sec.  154.2203  Facility requirements for barge vapor overpressure and
vacuum protection.

    In this section, the requirements of having a flame arrester or a
flame screen at the opening of a pressure relief valve or a vacuum
relief valve apply only to facilities collecting vapors of flammable,
combustible, or non-high flash point liquid cargoes.
    (a) A facility vapor collection system must have a capacity for
collecting cleaning facility vapors at a rate of no less than 1.1 times
the facility's maximum allowable gas-freeing rate, plus any inerting,
diluting, or enriching gas that may be added to the system.
    (b) A facility vapor control system (VCS) must be designed to
prevent the pressure in a vessel's cargo tanks from going below 80
percent of the highest setting of any of the barge's vacuum relief
valves or exceeding 80 percent of the lowest setting of any of the
barge's pressure relief valves. The VCS must be capable of maintaining
the pressure in the barge's cargo tanks within this range at any gas-
freeing rate less than or equal to the maximum gas-freeing rate
determined by the requirements in 46 CFR 39.6007(c).
    (c) A fluid displacement system must provide a pressure-sensing
device that activates an alarm that satisfies the requirements of 33
CFR 154.2100(e) when the pressure at the fluid injection connection
exceeds either the pressure corresponding to the upper pressure
determined in paragraph (b) of this section or a lower pressure agreed
upon by the facility and barge persons in charge. The pressure-sensing
device must be located in the fluid displacement system's piping
downstream of any devices that could potentially isolate the barge's
vapor collection system from the pressure-sensing device. The pressure
measured by the sensing device must be corrected for pressure drops
across any barge piping, hoses, or arms that are used to inject the
fluid.
    (d) A fluid displacement system must provide a pressure-sensing
device that is independent of the device required by paragraph (c) of
this section. This pressure-sensing device must activate the fluid
displacement system emergency shutdown and close the remotely operated
cargo vapor shutoff valve required by 33 CFR 154.2101(a). It must also
close the remotely operated shutoff valve required by 33 CFR
154.2202(c) when the pressure at the fluid injection connection reaches
a corresponding 90 percent of the lowest setting of any pressure relief
valve on the barge. The pressure-sensing device must be located in the
fluid displacement system's piping downstream of any device that could
potentially isolate the barge's VCS from the pressure-sensing device.
The pressure measured by the sensing device must be corrected for
pressure drops across any barge piping, hoses, or arms that are used to
inject the fluid.
    (e) If a vapor-moving device capable of drawing more than 0.5
pounds per square inch gauge (psig) vacuum is used to draw vapor, air,
inert gas, or other medium from the barge, a vacuum relief valve must
be installed on the facility's fixed vapor collection system piping
between the facility vapor connection and the vapor-moving device. The
vacuum relief valve must--
    (1) Relieve at a pressure such that the pressure at the facility
vapor connection is maintained at or above 14.2 pounds per square inch
absolute (psia) (-0.5 psig);
    (2) Have a relieving capacity equal to or greater than the maximum
capacity of the vapor-moving device;
    (3) Have a flame arrester or flame screen fitted at the vacuum
relief opening;
    (4) Have been tested for relieving capacity in accordance with
paragraph <IP_ADDRESS> of API 2000 (incorporated by

reference, see 33 CFR 154.106), with a flame arrester or flame screen
fitted; and
    (5) Be constructed of materials compatible with the vapors being
gas-freed.
    (f) The vacuum relief valve requirements of paragraph (e) of this
section may include a valve to isolate it from the facility vapor
collection piping, provided--
    (1) The isolation valve must be interlocked with any vapor-moving
device such that the vapor-moving device cannot activate unless the
isolation valve is in the full open position (i.e., the vacuum relief
valve is not isolated); and
    (2) The isolation valve can only be closed after the facility
person in charge has acknowledged that the hatch opening required by 33
CFR 154.2250(i) is open and secured.
    (g) If a vapor-moving device capable of drawing more than 0.5 psig
vacuum is used to draw vapor, air, inert gas, or other medium from the
barge, the facility must install portable, intrinsically safe,
pressure-sensing devices on any cargo tank, or on the common vapor
header, at the connection required by 46 CFR 39.6003(b) before any
cleaning operation begins on the tank. A pressure-sensing device must
be provided that--
    (1) Activates an alarm that satisfies 33 CFR 154.2100(e) when the
pressure in the cargo tank being cleaned falls below 80 percent of the
highest setting of any of the barge's vacuum relief valves, or a higher
pressure agreed upon by the facility and barge persons in charge; and
    (2) Activates the emergency shutdown system for the vapor-moving
device and closes the remotely operated cargo vapor shutoff valve
described in 33 CFR 154.2101(a) when the pressure in the cargo tank
being cleaned falls below 90 percent of the highest setting of any of
the barge's vacuum relief valves, or a higher pressure agreed upon by
the facility and barge persons in charge. This pressure-sensing device
must be independent of the device used to activate an alarm required by
paragraph (g)(1) of this section.
    (h) The pressure-sensing devices required by paragraph (g) of this
section must--
    (1) Have suitable means, such as approved intrinsic safety barriers
that are able to accept passive devices, so that the under-pressure
alarm circuits of the barge side of the under-pressure control system,
including cabling, normally closed switches, and pin and sleeve
connectors, are intrinsically safe;
    (2) Be connected to the under-pressure alarm system by a four-wire,
16-ampere shielded flexible cable; and
    (3) Have cable shielding grounded to the under-pressure alarm
system.
    (i) A pressure-indicating device must be provided within 6 meters
(19.7 feet) of the facility vapor connection which displays the
pressure in the vapor collection line upstream of any isolation valve
and any devices, such as strainers, that could cause a blockage in the
vapor line.
    (j) A fluid displacement system must include a pressure-indicating
device that displays the pressure in the fluid displacement system
injection line. This device must be within 6 meters (19.7 feet) of the
fluid injection connection.
    (k) If a fluid displacement system used to inject inert gas or
another medium into the cargo tank of a barge being gas-freed is
capable of producing a pressure greater than 2 psig, a pressure relief
valve must be installed in the fluid displacement system injection line
between the fluid injection source and the fluid injection connection
that--
    (1) Relieves at a predetermined pressure such that the pressure in
the fluid displacement system at the fluid injection connection does
not exceed 1.5 psig;
    (2) Has a relieving capacity equal to or greater than the maximum
volumetric flow capacity of the fluid displacement system;
    (3) Has a flame screen or flame arrester fitted at the relief
opening; and
    (4) Has been tested for relieving capacity in accordance with
paragraph <IP_ADDRESS> of API 2000, when fitted with a flame screen or flame
arrester.
    (l) When using the fluid displacement system, if the pressure in
the facility's fixed vapor collection system can exceed 2 psig during a
malfunction in an inerting, enriching, or diluting system, a pressure
relief valve must--
    (1) Be installed between the point where inerting, enriching, or
diluting gas is added to the facility's fixed vapor collection system
piping and the facility vapor connection;
    (2) Relieve at a predetermined pressure such that the pressure at
the facility vapor connection does not exceed 1.5 psig;
    (3) Have a relieving capacity equal to or greater than the maximum
capacity of the facility's inerting, enriching, or diluting gas source;
    (4) Have a flame screen or flame arrester fitted at the relief
opening;
    (5) Have been tested for relieving capacity in accordance with
paragraph <IP_ADDRESS> of API 2000, when fitted with a flame screen or flame
arrester; and
    (6) Be constructed of materials compatible with the vapors being
gas-freed.
    (m) For fluid displacement systems, the fluid injection connection
must be electrically insulated from the fluid injection source in
accordance with OCIMF ISGOTT section 17.5 (incorporated by reference,
see 33 CFR 154.106).
    (n) If the pressure relief valve is not designed with a minimum
vapor discharge velocity of 30 meters (98.4 feet) per second, the
relieving capacity test required by paragraphs (k)(4) and (l)(5) of
this section must be carried out with a flame screen or flame arrester
fitted at the discharge opening.
    (o) A pressure indicating device must be provided by the facility
for installation at the connection required by 46 CFR 39.6003(b).

Sec.  154.2204  Fire, explosion, and detonation protection.

    This section applies to tank barge cleaning facilities (TBCFs)
collecting vapors of flammable, combustible, or non-high flash point
liquid cargoes.
    (a) A vapor control system (VCS) with a single facility vapor
connection that processes vapor with a vapor recovery unit must--
    (1) Have a detonation arrester located as close as practicable to
the facility vapor connection. The total pipe length between the
detonation arrester and the facility vapor connection must not exceed
18 meters (59.1 feet) and the vapor piping between the detonation
arrester and the facility vapor connection must be protected from any
potential internal or external ignition source; or
    (2) Have an inerting, enriching, or diluting system that meets the
requirements of 33 CFR 154.2107.
    (b) A VCS with a single facility vapor connection that processes
vapor with a vapor destruction unit must--
    (1) Have a detonation arrester located as close as practicable to
the facility vapor connection. The total pipe length between the
detonation arrester and the facility vapor connection must not exceed
18 meters (59.1 feet) and the vapor piping between the detonation
arrester and the facility vapor connection must be protected from any
potential internal or external ignition source; and
    (2) Have an inerting, enriching, or diluting system that meets the
requirements of 33 CFR 154.2107.
    (c) A VCS with multiple facility vapor connections that processes
vapor with a vapor recovery unit must have a detonation arrester
located as close as practicable to each facility vapor

connection. The total pipe length between the detonation arrester and
each facility vapor connection must not exceed 18 meters (59.1 feet)
and the vapor piping between the detonation arrester and the facility
vapor connection must be protected from any potential internal or
external ignition source.
    (d) A VCS with multiple facility vapor connections that processes
vapor with a vapor destruction unit must--
    (1) Have a detonation arrester located as close as practicable to
each facility vapor connection. The total pipe length between the
detonation arrester and each facility vapor connection must not exceed
18 meters (59.1 feet) and the vapor piping between the detonation
arrester and the facility vapor connection must be protected from any
potential internal or external ignition source; and
    (2) Have an inerting, enriching, or diluting system that meets the
requirements of 33 CFR 154.2107.
    (e) 33 CFR 154.2105(j) applies to a TBCF's VCS.

Tank Barge Cleaning Facilities--Operations

Sec.  154.2250  General requirements.

    (a) No tank barge cleaning operation using a vapor control system
(VCS) may be conducted unless the facility operator has a copy of the
facility operations manual, with the VCS addendum, marked by the local
Coast Guard Captain of the Port (COTP) as required by 33 CFR
154.325(d).
    (b) The facility person in charge must ensure that a facility can
receive vapors only from a barge with a VCS that has been approved by
the Coast Guard Marine Safety Center as meeting the requirements of 46
CFR 39.6000.
    (c) The facility person in charge must ensure that safety system
tests are conducted as follows:
    (1) Pressure sensors, alarms, and automatic shutdown systems
required by 33 CFR 154.2203, except as exempted by paragraph (c)(2) or
as specified by paragraph (c)(3) of this section, must be tested by
applying altering test pressures at the sensors not more than 24 hours
before each cleaning operation;
    (2) The pressure sensors required by 33 CFR 154.2203 may meet the
test program in accordance with 33 CFR 154.2180 and 33 CFR 154.2181
instead of the test within 24 hours before each cleaning operation as
required by paragraph (c)(1) of this section;
    (3) Visible and audible alarm indicators must be tested not more
than 24 hours before each cleaning operation;
    (4) The analyzers, except for flammability analyzers, required by
33 CFR 154.2105(j) and 154.2107, except as exempted by paragraph (c)(5)
of this section, must be checked for calibration response by use of a
zero gas and a span gas not more than 24 hours before each cleaning
operation;
    (5) The analyzers required by 33 CFR 154.2105(j) and 154.2107 may
be checked for calibration response by use of a zero gas and a span gas
as defined by the test program contained in 33 CFR 154.2180 and 33 CFR
154.2181, and comply with the minimum requirements as defined in 33 CFR
154.2180 and 33 CFR 154.2181, instead of as provided by paragraph
(c)(4) of this section; and
    (6) The vacuum and pressure relief valves required by 33 CFR
154.2203 must be manually checked per manufacturers' instructions to
verify that the valves unseat easily and then reset to the closed
position without constraint. Any required flame screens or flame
arresters must also be visually checked to ensure that they are not
damaged.
    (d) The facility person in charge must verify the following before
beginning cleaning operations:
    (1) Each valve in the vapor collection system between the barge's
cargo tank and the facility vapor collection system is correctly
positioned to allow the collection of vapors;
    (2) A vapor collection hose or arm is connected to the barge's
vapor collection system;
    (3) The electrical insulating devices required by 33 CFR
154.2101(g) and 154.2203(m) are installed;
    (4) The maximum allowable gas-freeing rate as determined by the
lesser of the following:
    (i) A gas-freeing rate corresponding to the maximum vapor
processing rate for the tank barge cleaning facility's (TBCF's) VCS, as
specified in the facility operations manual; or
    (ii) The barge's maximum gas-freeing rate determined in accordance
with 46 CFR 39.6007(c);
    (5) The gas-freeing rate will not exceed the maximum allowable gas-
freeing rate as determined in paragraph (d)(4) of this section;
    (6) The maximum allowable stripping rate is determined and does not
exceed the volumetric capacity of the barge's vacuum relief valve at
the valve's setpoint for the cargo tank being stripped;
    (7) The barge's maximum and minimum operating pressures;
    (8) Each vapor collection hose has no unrepaired or loose covers,
kinks, bulges, soft spots, or any other defects that would permit the
discharge of vapor through the hose material; and no external gouges,
cuts, or slashes that penetrate the first layer of hose reinforcement;
    (9) The freezing point of each cargo. If there is a possibility
that the ambient air temperature during cleaning operations will be at
or below the freezing point of the cargo, adequate precautions have
been taken to prevent freezing of vapor or condensate, or to detect and
remove the frozen liquid and condensate to prevent accumulation; and
    (10) The cargo vapor is evaluated for the potential to polymerize,
and adequate precautions have been taken to prevent and detect
polymerization of the cargo vapors.
    (e) VCS equipment and instrumentation must be tested in compliance
with 33 CFR 156.170(g) or (i), with the COTP or designated
representative invited to observe these tests. The test procedure and a
checklist must be approved by the certifying entity during the initial
certification of the system and incorporated into the facility
operations manual.
    (f) If one or more analyzers required by 33 CFR 154.2107(d) or (e)
become inoperable during gas-freeing operations, the operation may
continue, provided that at least one analyzer remains operational;
however, no further gas-freeing operations may be started until all
inoperable analyzers are repaired or replaced.
    (g) Whenever a condition results in a shutdown of the VCS, the
cleaning operations must be immediately terminated. The operation may
not resume until the cause of the shutdown has been investigated and
corrective action taken.
    (h) If it is suspected that a flare in the VCS has had a flashback,
or if a flame is detected on a detonation arrester required by 33 CFR
154.2109(c)(2), the cleaning operation must be stopped and may not
resume until the detonation arrester and any quick-closing stop valves
downstream of the detonation arrester have been inspected and found to
be in satisfactory condition.
    (i) If a vacuum displacement system is used for gas-freeing, the
facility person in charge of the cleaning operation must verify the
following items:
    (1) The minimum amount of open area for air flow on the barge has
been determined so that the pressure in the cargo tank cannot be less
than 14.5 pounds per square inch absolute (psia) (-0.2 pounds per
square inch gauge (psig)) at the maximum flow capacity of the vapor-
moving device;

    (2) Any hatch or fitting providing the minimum open area has been
secured open so that accidental closure is not possible; and
    (3) The hatch and/or fitting must be opened before the pressure in
the cargo tank falls below 10 percent of the highest setting of any of
the barge's vacuum relief valves.
    (j) 33 CFR 154.2150(p) and (q) apply to a TBCF's VCS.

Appendix A to part 154 [Amended]

0
10. In Appendix A, 7.3, after the words ``ANSI B16.5'', add the words
``(incorporated by reference, see 33 CFR 154.106)''.

Appendix B to part 154 [Removed and Reserved]

0
11. Remove and reserve Appendix B to part 154.

PART 155--OIL OR HAZARDOUS MATERIAL POLLUTION PREVENTION
REGULATIONS FOR VESSELS

0
12. The authority citation for part 155 is revised to read as follows:

    Authority: 33 U.S.C. 1225, 1231, 1321(j), 1903(b); 46 U.S.C.
3703; E.O. 11735, 3 CFR, 1971-1975 Comp., p. 793; Department of
Homeland Security Delegation No. 0170.1. Section 155.490 also issued
under section 4110(b) of Pub. L. 101-380.

Sec.  155.750  [Amended]

0
13. In Sec.  155.750--
0
a. In paragraph (d)(3), remove the citation ``46 CFR 39.30-1(d)(1)
through (d)(3)'' and add, in its place, the citation ``46 CFR
39.3001(d)(1) through (3)'';
0
b. In paragraph (d)(4), remove the citation ``46 CFR 39.30-1(h)'' and
add, in its place, the citation ``46 CFR 39.3001(g)''; and
0
c. In paragraph (d)(5), remove the citation ``46 CFR 39.30-1(b)'' and
add, in its place, the citation ``46 CFR 39.3001(c)''.

PART 156--OIL AND HAZARDOUS MATERIAL TRANSFER OPERATIONS

0
14. The authority citation for part 156 is revised to read as follows:

    Authority: 33 U.S.C. 1225, 1231, 1321(j); 46 U.S.C. 3703, 3703a,
3715; E.O. 11735, 3 CFR 1971-1975 Comp., p. 793; Department of
Homeland Security Delegation No. 0170.1.

0
15. In Sec.  156.120--
0
a. Revise paragraph (aa) introductory text;
0
b. In paragraph (aa)(4), remove the word ``loading'' and add, in its
place, the word ``transfer'';
0
c. In paragraph (aa)(7) introductory text, after the words ``the
transfer operation'', add the words ``or in accordance with 33 CFR
154.2150(b)'';
0
d. In paragraph (aa)(7)(ii), remove the words ``Sec.  154.820(a), Sec.
154.824(d) and (e) of this chapter'' and add, in their place, the words
``33 CFR 154.2105(a) and (j) and 154.2107(d) and (e)'';
0
e. Revise paragraph (aa)(9); and
0
f. Add paragraphs (aa)(10) through (12).
    The revisions and additions read as follows:

Sec.  156.120  Requirements for transfer.

* * * * *
    (aa) A transfer operation which includes collection of vapor
emitted to or from a vessel's cargo tanks through a vapor control
system (VCS) not located on the vessel must have the following verified
by the person in charge:
* * * * *
    (9) The oxygen content in the vapor space of each of the vessel's
cargo tanks connected to the vapor collection system, if inerted, is--
    (i) At or below 60 percent by volume of the cargo's minimum oxygen
concentration for combustion; or
    (ii) At or below 8 percent by volume, at the start of cargo
transfer, for vapor of crude oil, gasoline blends, or benzene;
    (10) The freezing point of each cargo has been determined. If there
is a possibility that the ambient air temperature during transfer
operations will be at or below the freezing point of the cargo,
adequate precautions have been taken to prevent freezing of vapor or
condensate, or to detect and remove the liquid condensate and solids to
prevent accumulation;
    (11) If the cargo has the potential to polymerize, adequate
precautions have been taken to prevent and detect polymerization of the
cargo vapors; and
    (12) The VCS has been cleaned, in accordance with 33 CFR
154.2150(p), between transfers of incompatible cargoes.
* * * * *

0
16. In Sec.  156.170--
0
a. In paragraph (g) introductory text, after the words ``collects vapor
emitted'', add the words ``to or'';
0
b. In paragraph (g)(3), remove the words ``Sec.  154.820, Sec.
154.826(a), and Sec.  154.828(a) of this chapter or 46 CFR 39.40-3(d),
and each flame arrester required by Sec.  154.826(a), Sec.  154.828(a)
and (c) of this chapter'' and add, in their place, the words ``33 CFR
154.2105, 154.2108(b), 154.2109, 154.2110, 154.2111, and 154.2204, or
46 CFR 39.4003, and each flame arrester required by 33 CFR 154.2103,
154.2105(j), and 154.2203'';
0
c. In paragraph (g)(4) introductory text, remove the words ``Sec.
154.820(a) and Sec.  154.824(d) and (e) of this chapter or 46 CFR
39.40-3(a)'' and add, in their place, the words ``33 CFR 154.2105(a)
and (j), 154.2107(d) and (e), and 154.2110 or 46 CFR 39.4003''; and
0
d. Add paragraph (i) to read as follows:

Sec.  156.170  Equipment tests and inspections.

* * * * *
    (i) Notwithstanding the general provisions of 33 CFR 156.107(a)
relating to the authority of the Captain of the Port to approve
alternatives, the owner or operator may request the written approval of
the Commandant (CG-ENG), U.S. Coast Guard, 2100 2nd St. SW., Stop 7126,
Washington, DC 20593-7126, for alternative methods of compliance to the
testing and inspection requirements of paragraph (g)(3) of this
section. The Commandant (CG-ENG) will grant that written approval upon
determination that the alternative methods provide an equivalent level
of safety and protection from fire, explosion, and detonation. Criteria
to consider when evaluating requests for alternative methods may
include, but are not limited to: operating and inspection history, type
of equipment, new technology, and site-specific conditions that support
the requested alternative.
* * * * *

Title 46--Shipping

PART 35--OPERATIONS

0
17. The authority citation for part 35 is revised to read as follows:

    Authority: 33 U.S.C. 1225, 1231, 1321(j); 46 U.S.C. 3306, 3703,
6101; 49 U.S.C. 5103, 5106; E.O. 12234, 45 FR 58801, 3 CFR, 1980
Comp., p. 277; E.O. 12777, 56 FR 54757, 3 CFR, 1991 Comp., p. 351;
Department of Homeland Security Delegation No. 0170.1.

0
18. Add Sec.  35.35-4 to read as follows:

Sec.  35.35-4  Insulating flange joint or nonconductive hose--TB/ALL.

    (a) A vessel's cargo hose string or vapor recovery hose must use an
insulating flange or one continuous length of nonconductive hose
between the vessel and the shore transfer facility. For each vapor
recovery hose or cargo hose string, only one insulating flange or non-
conductive hose must be provided. See 33 CFR 154.2101(g).
    (b) The insulating flange must be inserted at the jetty end and
take all reasonable measures to ensure the connection will not be
disturbed. The hose must be suspended to ensure the hose-to-hose
connection flanges do not rest on the jetty deck or other structure
that may render the insulating flange

ineffective or short circuited by contact with external metal or
through the hose handling equipment.
    (c) The insulating flange must be inspected and tested at least
annually, or more frequently if necessary due to deterioration caused
by environmental exposure, usage, and damage from handling. After
installation, the insulation reading between the metal pipe on the
shore side of the flange and the end of the hose or metal arm when
freely suspended must not be less than 1,000 ohms. A suitable DC
insulation tester must be used.

0
19. Revise Sec.  35.35-5 to read as follows:

Sec.  35.35-5  Electrical bonding--TB/ALL.

    The use of a vessel/shore bonding cable or wire is permissible only
if operationally necessary and only in compliance with the requirements
of paragraphs (a) and (b) of this section.
    (a) A switch on the jetty that is in series with the bonding cable
must be provided. The switch must be listed or certified by a Coast
Guard accepted independent laboratory and approved for use in a Class I
Zone 1 or Class I, Division 1 location, and the appropriate Gas Group
of the cargo authorized for the vessel.
    (b) The connection point for the bonding cable system must be at
least 20 feet from the cargo manifold area, the cargo hose string, or
the vapor recovery connection. The switch must be in the off position
before connecting or disconnecting the bonding cable. The bonding cable
must be attached before the cargo hoses or arms, or the vapor recovery
connections are connected. The bonding cable must be removed only after
the cargo hoses or arms, or the vapor recovery connections have been
disconnected.

0
20. In Sec.  35.35-20--
0
a. In paragraph (m) introductory text, after the words ``collection of
cargo vapor'', add the words ``to or'';
0
b. In paragraph (m)(1), after the words ``vapor to flow to'', add the
words ``or from''; and
0
c. Revise paragraph (m)(9) to read as follows:

Sec.  35.35-20  Inspection before transfer of cargo--TB/ALL.

* * * * *
    (m) * * *
    (9) The oxygen content in the vapor space of each of the vessel's
inerted cargo tanks connected to the vapor collection system is--
    (i) At or below 60 percent by volume of the cargo's minimum oxygen
concentration for combustion at the start of cargo transfer; or
    (ii) At or below 8 percent by volume, at the start of cargo
transfer, for vapor of crude oil, gasoline blends, or benzene.

0
21. In Sec.  35.35-30--
0
a. In paragraph (c) introductory text, after the words ``collection of
cargo vapor'', add the words ``to or'';
0
b. In paragraph (c)(1), after the words ``vapor to flow to'', add the
words ``or from''; and
0
c. Revise paragraph (c)(8) to read as follows:

Sec.  35.35-30  ``Decaration of Inspection'' for tank vessels---TB/ALL.

* * * * *
    (c) * * *
    (8) Has the oxygen content in the vapor space of each of the
vessel's inerted cargo tanks connected to the vapor collection system
been verified to be--
    (i) At or below 60 percent by volume, at the start of cargo
transfer, of the cargo's minimum oxygen concentration for combustion;
or
    (ii) At or below 8 percent by volume, at the start of cargo
transfer, for vapor of crude oil, gasoline blends, or benzene.

0
22. Revise part 39 to read as follows:

PART 39--VAPOR CONTROL SYSTEMS

Subpart 39.1000--General
Sec.
39.1001 Applicability--TB/ALL.
39.1003 Definitions--TB/ALL.
39.1005 Incorporation by reference--TB/ALL.
39.1009 Additional tank vessel vapor processing unit requirements--
TB/ALL.
39.1011 Personnel training requirements--TB/ALL.
39.1013 U.S.-flagged tank vessel certification procedures for vapor
control system designs--TB/ALL.
39.1015 Foreign-flagged tank vessel certification procedures for
vapor control system designs--TB/ALL.
39.1017 Additional certification procedures for a tank barge vapor
collection system design--B/ALL.
Subpart 39.2000--Equipment and Installation
39.2001 Vapor collection system--TB/ALL.
39.2003 Cargo gauging system--TB/ALL.
39.2007 Tankship liquid overfill protection--T/ALL.
39.2009 Tank barge liquid overfill protection--B/ALL.
39.2011 Vapor overpressure and vacuum protection--TB/ALL.
39.2013 High and low vapor pressure protection for tankships--T/ALL.
39.2014 Polymerizing cargoes safety--TB/ALL.
39.2015 Tank barge pressure-vacuum indicating devices--B/ALL.
Subpart 39.3000--Vapor Collection Operations During Cargo Transfer
39.3001 Operational requirements for vapor control systems during
cargo transfer--TB/ALL.
Subpart 39.4000--Vessel-to-Vessel Transfers Using Vapor Balancing
39.4001 General requirements for vapor balancing--TB/ALL.
39.4003 Design and equipment for vapor balancing--TB/ALL.
39.4005 Operational requirements for vapor balancing--TB/ALL.
Subpart 39.5000--Multi-breasted Loading Using a Single Facility Vapor
Connection
39.5001 General requirements for multi-breasted loading--B/CLBR.
39.5003 Additional requirements for multi-breasted loading using
inboard barge vapor collection system--B/CLBR.
39.5005 Additional requirements for multi-breasted loading using a
``dummy'' vapor header--B/CLBR.
Subpart 39.6000--Tank Barge Cleaning Operations with Vapor Collection
39.6001 Design and equipment of vapor collection and stripping
systems--B/ALL.
39.6003 Overpressure and underpressure protection during stripping
and gas-freeing operations--B/ALL.
39.6005 Inspection prior to conducting gas-freeing operations--B/
ALL.
39.6007 Operational requirements for tank barge cleaning--B/ALL.
39.6009 Barge person in charge: Designation and qualifications--B/
ALL.

    Authority:  33 U.S.C. 1225, 1231; 42 U.S.C. 7511b(f)(2); 46
U.S.C. 3306, 3703, 3715(b); E.O. 12234, 45 FR 58801, 3 CFR, 1980
Comp., p. 277; Department of Homeland Security Delegation No.
0170.1.

Subpart 39.1000--General

Sec.  39.1001  Applicability--TB/ALL.

    (a) This part applies to tank vessels that use a vapor control
system (VCS) to collect vapors emitted to or from a vessel's cargo
tanks while operating in the navigable waters of the United States,
except--
    (1) Tank vessels with an operating vapor collection system approved
by the Coast Guard prior to July 23, 1990, for the collection and
transfer of cargo vapor to specific facilities. Such tank vessels are
only subject to 46 CFR 39.1013, 39.3001, and 39.4005; and
    (2) A tank barge that collects vapors emitted from its cargo tanks
during gas-freeing or cleaning operations at a cleaning facility. This
type of tank barge is only subject to 46 CFR part 39, subparts 39.1000
and 39.6000, and must comply with requirements of these two subparts at
the time of its next inspection for certification required by 46 CFR
31.10-15, but no later than August 15, 2018.

    (b) This part does not apply to the collection of vapors of
liquefied flammable gases as defined in 46 CFR 30.10-39.
    (c) In this part, regulatory measurements, whether in the metric or
English system, are sometimes followed by approximate equivalent
measurements in parentheses, which are given solely for the reader's
convenience. Regulatory compliance with the regulatory measurement is
required.

Sec.  39.1003  Definitions--TB/ALL.

    As used in this part only:
    Barge vapor connection means the point in a barge's piping system
where it connects to a vapor collection hose or arm. This may be the
same as the barge's cargo connection while controlling vapors during
tank barge cargo tank-cleaning operations.
    Cargo deck area means that part of the weather deck that is
directly over the cargo tanks.
    Cargo tank venting system means the venting system required by 46
CFR 32.55.
    Certifying entity means a certifying entity accepted by the Coast
Guard as such pursuant to 33 CFR part 154, subpart P.
    Cleaning facility means a facility used or capable of being used to
conduct cleaning operations on a tank barge.
    Cleaning operation means any stripping, gas-freeing, or tank-
washing operation of a barge's cargo tanks conducted at a cleaning
facility.
    Commandant means the Commandant (CG-ENG), U.S. Coast Guard, 2100
2nd St. SW., Stop 7126, Washington, DC 20593-7126.
    Facility vapor connection means the point in a facility's fixed
vapor collection system where the system connects with the vapor
collection hose or the base of the vapor collection arm.
    Fixed stripping line means a pipe extending to the low point of
each cargo tank, which is welded through the deck and terminated above
deck with a valve, and plugged at the open end.
    Flammable liquid means a liquid as defined in 46 CFR 30.10-22.
    Fluid displacement system means a system that removes vapors from a
barge's cargo tanks during gas freeing through the addition of an inert
gas or other medium into the cargo tank.
    Fluid injection connection means the point in a fluid displacement
system at which the fixed piping or hose that supplies the inert gas or
other medium connects to a barge's cargo tanks or fixed piping system.
    Gas freeing means the removal of vapors from a tank barge.
    Independent as applied to two systems means that one system will
operate when there is a failure of any part of the other system.
    Inerted means the oxygen content of the vapor space in a cargo tank
is reduced in accordance with the inert gas requirements of 46 CFR
32.53 or 33 CFR 153.500. If a cargo vapor in a cargo tank that is
connected to the vapor collection system is defined as inerted at the
start of cargo transfer, the oxygen content in the vapor space of the
cargo tank must not exceed 60 percent by volume of the cargo's minimum
oxygen concentration for combustion, or 8 percent by volume for vapor
of crude oil, gasoline blends, or benzene.
    Marine Safety Center (MSC) means the Commanding Officer, U.S. Coast
Guard Marine Safety Center, 2100 2nd Street SW., Stop 7102, Washington,
DC 20593-7102.
    Maximum allowable gas-freeing rate means the maximum volumetric
rate at which a barge may be gas-freed during cleaning operations.
    Maximum allowable stripping rate means the maximum volumetric rate
at which a barge may be stripped during cleaning operations prior to
the opening of any hatch and/or fitting on the cargo tank being
stripped.
    Maximum allowable transfer rate means the maximum volumetric rate
at which a vessel may receive cargo or ballast.
    Minimum oxygen concentration for combustion (MOCC) means the lowest
level of oxygen in a vapor or vapor mixture that will support
combustion.
    New vapor collection system means a vapor collection system that is
not an existing vapor collection system.
    Service vessel means a vessel that transports bulk liquid cargo
between a facility and another vessel.
    Set pressure means the pressure at which the pressure or vacuum
valve begins to open and the flow starts through the valve.
    Stripping means the removal, to the maximum extent practicable, of
cargo residue remaining in the barge's cargo tanks and associated fixed
piping system after cargo transfer or during cleaning operations.
    Vacuum displacement system means a system that removes vapors from
a barge's cargo tanks during gas-freeing by sweeping air through the
cargo tank hatch openings.
    Vapor balancing means the transfer of vapor displaced by incoming
cargo from the tank of a vessel or facility receiving cargo into a tank
of the vessel or facility delivering cargo via a vapor collection
system.
    Vapor collection system means an arrangement of piping and hoses
used to collect vapor emitted to or from a vessel's cargo tanks and to
transport the vapor to a vapor processing unit or a tank.
    Vapor control system (VCS) means an arrangement of piping and
equipment used to control vapor emissions collected to or from a
vessel. It includes the vapor collection system and vapor processing
unit or a tank.
    Vapor processing unit means the components of a VCS that recover,
destroy, or disperse vapor collected from a vessel.
    Vessel-to-vessel transfer (direct or through a shore loop) means
either--
    (1) The transfer of a bulk liquid cargo from a tank vessel to a
service vessel; or
    (2) The transfer of a bulk liquid cargo from a service vessel to
another vessel in order to load the receiving vessel to a deeper draft.
    Vessel vapor connection means the point in a vessel's fixed vapor
collection system where the system connects with the vapor collection
hose or arm.

Sec.  39.1005  Incorporation by reference--TB/ALL.

    (a) Certain material is incorporated by reference (IBR) into this
part with the approval of the Director of the Federal Register under 5
U.S.C. 552(a) and 1 CFR part 51. To enforce any edition other than that
specified in this section, the Coast Guard must publish notice of
change in the Federal Register and the material must be available to
the public. All approved material is available for inspection at the
Coast Guard, Office of Design and Engineering Standards (CG-ENG) 2100
2nd Street SW., Stop 7126, Washington, DC 20593-7126, telephone 202-
372-1418 and at the National Archives and Records Administration
(NARA). For information on the availability of this material at NARA,
call<PHONE_NUMBER> or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Also, it is
available from the sources indicated in this section.
    (b) American National Standards Institute (ANSI), 25 West 43rd
Street, 4th floor, New York, NY 10036.
    (1) ANSI B16.5, Steel Pipe Flanges and Flanged Fittings, 1981, IBR
approved for Sec. Sec.  39.2001(i) and 39.6001(k).
    (2) [Reserved]
    (c) American Petroleum Institute (API), 1220 L Street NW.,
Washington, DC 20005.
    (1) API Standard 2000, Venting Atmospheric and Low-Pressure Storage
Tanks (Non-refrigerated and

Refrigerated), Third Edition, January 1982 (reaffirmed December
1987)(``API 2000''), IBR approved for Sec.  39.2011(b).
    (2) [Reserved]
    (d) ASTM International (ASTM), 100 Barr Harbor Drive, West
Conshohocken, PA 19428-2959.
    (1) ASTM F1122-87 (Reapproved1992)--Standard Specification for
Quick Disconnect Couplings (``ASTM F1122''), IBR approved for Sec.
39.2001(k).
    (2) ASTM F1271--Standard Specification for Spill Valves for Use in
Marine Tank Liquid Overpressure Protection Applications (``ASTM
F1271''), December 29, 1989, IBR approved for Sec.  39.2009(a).
    (e) International Electrotechnical Commission (IEC), Bureau Central
de la Commission Electrotechnique Internationale, 3, rue de
Varemb[eacute], P.O. Box 131, CH--1211 Geneva 20, Switzerland.
    (1) IEC 60309-1 Plugs, Socket-Outlets and Couplers for Industrial
Purposes--Part 1: General Requirements, Edition 4.2 2012-06, IBR
approved for Sec.  39.2009(a).
    (2) IEC 60309-2 Plugs, Socket-Outlets and Couplers for Industrial
Purposes--Part 2: Dimensional Interchangeability Requirements for Pin
and Contact-tube Accessories, Edition 4.2 2012-05, IBR approved for
Sec.  39.2009(a).
    (f) International Maritime Organization (IMO), 4 Albert Embankment,
London SE1 7SR, United Kingdom.
    (1) International Convention for the Safety of Life at Sea,
Consolidated Text of the 1974 SOLAS Convention, the 1978 SOLAS
Protocol, the 1981 and 1983 SOLAS Amendments (1986) (``SOLAS''), IBR
approved for Sec.  39.2001(e).
    (2) [Reserved]
    (g) National Electrical Manufacturers Association (NEMA), 1300
North 17th Street, Suite 1752, Rosslyn, VA 22209.
    (1) ANSI NEMA WD-6--Wiring Devices, Dimensional Requirements, 1988
(``NEMA WD-6''), IBR approved for Sec.  39.2009(a)
    (2) [Reserved]
    (h) National Fire Protection Association (NFPA), 1 Batterymarch
Park, Quincy, MA 02169-7471.
    (1) NFPA 70--National Electrical Code, 2011, IBR approved for Sec.
39.2009(a).
    (2) [Reserved]
    (i) Oil Companies International Marine Forum (OCIMF), 29 Queen
Anne's Gate, London SWIH 9BU, England.
    (1) International Safety Guide for Oil Tankers and Terminals, Fifth
Edition, 2006 (``ISGOTT''), IBR approved for Sec. Sec.  39.3001(g),
39.5001(c), 39.6001(g), and 39.6005(a).
    (2) [Reserved]

Sec.  39.1009  Additional tank vessel vapor processing unit
requirements--TB/ALL.

    (a) Vapor piping, fitting, valves, flanges, and pressure vessels
comprising the construction and installation of a permanent or portable
vapor processing unit onboard a tank vessel must meet the marine
engineering requirements of 46 CFR chapter I, subchapter F.
    (b) Electrical equipment comprising the construction and
installation of a permanent or portable vapor processing unit onboard a
tank vessel must meet the electrical engineering requirements of 46 CFR
chapter I, subchapter J.
    (c) In addition to complying with the rules of this part, tank
vessels with a permanent or portable vapor processing unit must comply
with applicable requirements of 33 CFR part 154, subpart P.
    (d) When differences between the requirements for vessels contained
in 46 CFR chapter I, subchapters F and J and requirements for
facilities contained in 33 CFR part 154, subpart P need to be resolved,
the requirements of 46 CFR chapter I, subchapters F and J apply, unless
specifically authorized by the Marine Safety Center.

Sec.  39.1011  Personnel training requirements--TB/ALL.

    Personnel responsible for operating the vapor control system (VCS)
must complete a training program prior to the operation of the system
installed onboard the tank vessel. As part of the training program,
personnel must be able to demonstrate, through drills and practical
knowledge, the proper VCS operation procedures for normal and emergency
conditions. The training program must cover the following subjects:
    (a) Purpose of a VCS;
    (b) Principles of the VCS;
    (c) Components of the VCS;
    (d) Hazards associated with the VCS;
    (e) Coast Guard regulations in this part;
    (f) Vapor control operation procedures during cargo transfer or
tank barge cleaning, including:
    (1) Testing and inspection requirements;
    (2) Pre-transfer or pre-cleaning procedures;
    (3) Connection sequence;
    (4) Startup procedures; and
    (5) Normal operations; and
    (g) Emergency procedures.

Sec.  39.1013  U.S.-flagged tank vessel certification procedures for
vapor control system designs--TB/ALL.

    (a) For an existing Coast Guard-approved vapor control system (VCS)
that has been operating before July 23, 1990, the tank vessel owner or
operator must submit detailed engineering drawings, calculations, and
specifications to the Marine Safety Center (MSC) for review and
approval before modifying the system or transferring vapor to a
facility that was not approved by the Coast Guard for that kind of
vapor transfer.
    (b) For a Coast Guard-approved vessel VCS that began operating on
or after July 23, 1990, the tank vessel owner or operator must submit
plans, calculations, and specifications to the MSC for review and
approval before modifying the system.
    (c) A tank vessel owner or operator must submit plans,
calculations, and specifications for a new tank vessel VCS to the MSC
for review and approval before installing the system. A permanent or
portable vapor processing unit onboard a tank vessel will be reviewed,
together with the tank vessel, as a complete and integrated system.
    (d) Once the plan review and inspection of the tank vessel VCS
satisfy the requirements of this part, the Officer in Charge, Marine
Inspection (OCMI) will endorse the Certificate of Inspection for the
U.S.-flagged tank vessel.

Sec.  39.1015  Foreign-flagged tank vessel certification procedures for
vapor control system designs--TB/ALL.

    As an alternative to meeting the requirements in 33 CFR 39.1013(a),
(b), and (c), the owner or operator of a foreign-flagged tank vessel
may submit certification by the classification society that classifies
vessels under their foreign flags to the Marine Safety Center. Upon
receipt of the certification stating that the vapor control system
(VCS) meets the requirements of this part, the Officer in Charge,
Marine Inspection (OCMI) will endorse the vessel's Certificate of
Compliance for foreign-flagged tank vessels.

Sec.  39.1017  Additional certification procedures for a tank barge
vapor collection system design--B/ALL.

    (a) For a tank barge vapor collection system intended for operation
in multi-breasted loading using a single facility vapor connection, the
tank barge owner or operator must submit plans, calculations, and
specifications to the Marine Safety Center (MSC) for review and
approval before beginning a multi-breasted loading operation.

    (b) For a tank barge intended for collecting vapors emitted from
its cargo tanks during gas-freeing or cleaning operations at a cleaning
facility, the barge owner or operator must submit the following items
to the MSC for review and approval:
    (1) Stripping system plans and specifications, except those
approved by the MSC on or before the August 15, 2013; and
    (2) Stripping and/or gas-freeing rate calculations, except those
approved by the MSC on or before the August 15, 2013.
    (c) Once the vapor collection system satisfies the requirements of
this part, the Officer in Charge, Marine Inspection (OCMI) will endorse
the Certificate of Inspection that the tank barge is acceptable for
collecting vapors during cleaning operations.

Subpart 39.2000--Equipment and Installation

Sec.  39.2001  Vapor collection system--TB/ALL.

    (a) Vapor collection piping must be fixed piping and the vessel's
vapor connection must be located as close as practicable to the loading
manifold, except--
    (1) As allowed by the Commandant; and
    (2) A vessel certificated to carry cargo listed in 46 CFR, part
151, Table 151.05 or part 153, Table 1 may use flexible hoses no longer
than three meters (9.84 feet) for interconnection between fixed piping
onboard the vessel to preserve segregation of cargo systems. These
flexible hoses must also meet the requirements in paragraph (i) of this
section, excluding paragraph (i)(5), and meet the following additional
requirements:
    (i) The installation of flexible hoses must include an isolation
valve mounted on the tank side of the connection; and
    (ii) Hose connections permitted under paragraph (a)(2) of this
section are exempt from the requirements of paragraph (h) of this
section.
    (b) When collecting incompatible vapors simultaneously, vapors must
be kept separate throughout the entire vapor collection system.
    (c) Vapor collection piping must be electrically bonded to the hull
and must be electrically continuous.
    (d) The vapor collection system must have a mechanism to eliminate
liquid condensation, such as draining and collecting liquid from each
low point in the line.
    (e) For a tankship that has an inert gas system, a mechanism must
be in place to isolate the inert gas supply from the vapor control
system (VCS). The inert gas main isolation valve required by chapter
II-2, Regulation 62.10.8 of SOLAS (incorporated by reference, see 46
CFR 39.1005), may be used to satisfy this requirement.
    (f) The vapor collection system must not interfere with the proper
operation of the cargo tank venting system.
    (g) The tank vessel owner or operator must install an isolation
valve capable of manual operation. It must be located at the vessel
vapor connection and must clearly show whether the valve is in the open
or closed position via an indicator, valve handle, or valve stem.
    (h) The last 1.0 meter (3.3 feet) of vapor piping upstream of the
vessel vapor connection and each end of a vapor hose must be--
    (1) Painted in the sequence of red/yellow/red. The width of the red
bands must be 0.1 meter (0.33 foot) and the width of the middle yellow
band must be 0.8 meter (2.64 feet); and
    (2) Labeled with the word ``VAPOR'' painted in black letters at
least 50.8 millimeters (2 inches) high.
    (i) Hoses that transfer vapors must meet the following
requirements:
    (1) Have a design burst pressure of at least 25 pounds per square
inch gauge (psig);
    (2) Have a maximum allowable working pressure no less than 5 psig;
    (3) Be capable of withstanding at least a 2.0 pounds per square
inch (psi) vacuum without collapsing or constricting;
    (4) Be electrically continuous with a maximum resistance of 10,000
ohms;
    (5) Have flanges with--
    (i) A bolthole arrangement complying with the requirements for 150
pound class ANSI B16.5 flanges (incorporated by reference, see 46 CFR
39.1005); and
    (ii) One or more 15.9 millimeter (0.625 inch) diameter hole(s)
located midway between boltholes and in line with the bolthole pattern;
and
    (6) Be abrasion and kinking resistant.
    (j) Each vessel vapor connection flange face must have a permanent
stud projecting outward that has a 12.7 millimeter (0.5 inch) diameter
and is at least 25.4 millimeters (1 inch) long. It must be located at
the top of the flange face, midway between boltholes, and in line with
the bolthole pattern.
    (k) Quick disconnect couplings (QDCs) may be used instead of
flanges at the flexible hose connection and fixed piping on tankships
provided they meet ASTM F1122 (incorporated by reference, see 46 CFR
39.1005) and are designed as ``Standard Class QDC.''
    (l) Hose saddles that provide adequate support to prevent kinking
or collapse of hoses must accompany vapor hose handling equipment.
    (m) For cargoes that have toxic properties, listed in 46 CFR Table
151.05 with the ``Special requirements'' column referring to 46 CFR
151.50-5, an overfill alarm and shutdown system that meet the
requirements of 46 CFR 39.2007(a), 39.2009(a), or 39.2009(b) must be
used for primary overfill protection. If the vessel is also equipped
with spill valves or rupture disks, their setpoints must be set higher
than the vessel's pressure relief valve setting as required by 46 CFR
39.2009(a)(3).

Sec.  39.2003  Cargo gauging system--TB/ALL.

    (a) A cargo tank of the tank vessel connected to a vapor collection
system must be equipped with a permanent or portable cargo gauging
device that--
    (1) Is a closed type as defined in 46 CFR 151.15.10(c) that does
not require opening the tank to the atmosphere during cargo transfer;
    (2) Allows the operator to determine the level of liquid in the
tank for the full range of liquid levels in the tank;
    (3) Has an indicator for the level of liquid in the tank that is
located where cargo transfer is controlled; and
    (4) If portable, is installed on the tank during the entire
transfer operation.
    (b) Each cargo tank of a tank barge must have a high-level
indicating device, unless the barge complies with 46 CFR 39.2009(a).
The high-level indicating device must--
    (1) Indicate visually the level of liquid in the cargo tank when
the liquid level is within a range of 1 meter (3.28 feet) of the top of
the tank;
    (2) Show a permanent mark to indicate the maximum liquid level
permitted under 46 CFR 39.3001(e) at even keel conditions; and
    (3) Be visible from all cargo control areas.

Sec.  39.2007  Tankship liquid overfill protection--T/ALL.

    (a) Each cargo tank of a tankship must be equipped with an
intrinsically safe high-level alarm and a tank overfill alarm.
    (b) If installed after July 23, 1990, the high-level alarm and tank
overfill alarm required by paragraph (a) of this section must--
    (1) Be independent of each other;
    (2) Activate an alarm in the event of loss of power to the alarm
system;
    (3) Activate an alarm during the failure of electrical circuitry to
the tank level sensor; and
    (4) Be able to be verified at the tank for proper operation prior
to each transfer. This procedure may be achieved with the use of an
electronic

self-testing feature that monitors the condition of the alarm circuitry
and sensor.
    (c) The high-level alarm required by paragraph (a) of this section
must--
    (1) Activate an alarm once the cargo level reaches 95 percent of
the tank capacity or higher, but before the tank overfill alarm;
    (2) Be identified with the legend ``High-level Alarm'' in black
letters at least 50.8 millimeters (2 inches) high on a white
background; and
    (3) Activate a visible and audible alarm so that it can be seen and
heard on the vessel where cargo transfer is controlled.
    (d) The tank overfill alarm required by paragraph (a) of this
section must--
    (1) Be independent of the cargo gauging system;
    (2) Be identified with the legend ``TANK OVERFILL ALARM'' in black
letters at least 50.8 millimeters (2 inches) high on a white
background;
    (3) Activate a visible and audible alarm so that it can be seen and
heard on the vessel where cargo transfer is controlled and in the cargo
deck area; and
    (4) Activate an alarm early enough to allow the person in charge of
transfer operations to stop the cargo transfer before the tank
overflows.
    (e) If a spill valve is installed on a cargo tank fitted with a
vapor collection system, it must meet the requirements of 46 CFR
39.2009(c).
    (f) If a rupture disk is installed on a cargo tank fitted with a
vapor collection system, it must meet the requirements of 46 CFR
39.2009(d).

Sec.  39.2009  Tank barge liquid overfill protection--B/ALL.

    (a) Each cargo tank of a tank barge must have one of the following
liquid overfill protection arrangements:
    (1) A system meeting the requirements of 46 CFR 39.2007 that--
    (i) Includes a self-contained power supply;
    (ii) Is powered by generators on the barge; or
    (iii) Receives power from a facility and is fitted with a shore tie
cable and a 120-volt, 20-ampere explosion-proof plug that meets--
    (A) ANSI NEMA WD-6 (incorporated by reference, see 46 CFR 39.1005);
    (B) NFPA 70, Articles 406.9 and 501-145 (incorporated by reference,
see 46 CFR 39.1005); and
    (C) 46 CFR 111.105-9;
    (2) An intrinsically safe overfill control system that--
    (i) Is independent of the cargo-gauging device required by 46 CFR
39.2003(a);
    (ii) Activates an alarm and automatic shutdown system at the
facility overfill control panel 60 seconds before the tank is 100
percent liquid-full during a facility-to-vessel cargo transfer;
    (iii) Activates an alarm and automatic shutdown system on the
vessel discharging cargo 60 seconds before the tank is 100 percent
liquid-full during a vessel-to-vessel cargo transfer;
    (iv) Can be inspected at the tank for proper operation prior to
each loading;
    (v) Consists of components that, individually or in series, will
not generate or store a total of more than 1.2 volts (V), 0.1 amperes
(A), 25 megawatts (MW), or 20 microJoules ([mu]J);
    (vi) Has at least one tank overfill sensor switch per cargo tank
that is designed to activate an alarm when its normally closed contacts
are open;
    (vii) Has all tank overfill sensor switches connected in series;
    (viii) Has interconnecting cabling that meets 46 CFR 111.105-11(b)
and (d), and 46 CFR 111.105-17(a); and
    (ix) Has a male plug with a five-wire, 16-A connector body meeting
IEC 60309-1 and IEC 60309-2 (both incorporated by reference, see 46 CFR
39.1005), that is--
    (A) Configured with pins S2 and R1 for the tank overfill sensor
circuit, pin G connected to the cabling shield, and pins N and T3
reserved for an optional high-level alarm circuit meeting the
requirements of this paragraph; and
    (B) Labeled ``Connector for Barge Overflow Control System'' and
labeled with the total inductance and capacitance of the connected
switches and cabling;
    (3) A spill valve that meets ASTM F1271 requirements (incorporated
by reference, see 46 CFR 39.1005), and--
    (i) Relieves at a predetermined pressure higher than the pressure
at which the pressure relief valves meeting the requirements of 46 CFR
39.2011 operate;
    (ii) Limits the maximum pressure at the top of the cargo tank
during liquid overfill to not more than the maximum design working
pressure for the tank when at the maximum loading rate for the tank;
and
    (iii) Has a means to prevent opening due to cargo sloshing while
the vessel is in ocean or coastwise service; or
    (4) A rupture disk arrangement that meets paragraphs (a)(3)(i),
(ii), and (iii) of this section and is approved by the Commandant.
    (b) A tank barge authorized to carry a cargo having toxic
properties, meaning they are listed in 46 CFR Table 151.05 with the
``Special requirements'' column referring to 46 CFR 151.50-5, must
comply with the requirements of 46 CFR 39.2001(m).

Sec.  39.2011  Vapor overpressure and vacuum protection--TB/ALL.

    (a) The cargo tank venting system required by 46 CFR 32.55 must--
    (1) Be capable of discharging cargo vapor at the maximum transfer
rate plus the vapor growth for the cargo such that the pressure in the
vapor space of each tank connected to the vapor control system (VCS)
does not exceed--
    (i) The maximum design working pressure for the tank; or
    (ii) If a spill valve or rupture disk is fitted, the pressure at
which the device operates;
    (2) Relieve at a pressure corresponding to a pressure in the cargo
tank vapor space not less than 1.0 pounds per square inch gauge (psig);
    (3) Prevent a vacuum, which generates in any tank connected to the
vapor collection system during the withdrawal of cargo or vapor at
maximum rates, in a cargo tank vapor space from exceeding the maximum
design vacuum; and
    (4) Not relieve at a vacuum corresponding to a vacuum in the cargo
tank vapor space between 14.7 pounds per square inch absolute (psia) (0
psig) and 14.2 psia (-0.5 psig).
    (b) Each pressure-vacuum relief valve must--
    (1) Be of a type approved under 46 CFR 162.017, for the pressure
and vacuum relief setting desired;
    (2) Be tested for venting capacity in accordance with paragraph
<IP_ADDRESS> of API 2000 (incorporated by reference, see 46 CFR 39.1005).
The test must be carried out with a flame screen fitted at the vacuum
relief opening and at the discharge opening if the pressure-vacuum
relief valve is not designed to ensure a minimum vapor discharge
velocity of 30 meters (98.4 feet) per second; and
    (3) If installed after July 23, 1991, have a mechanism to check
that it operates freely and does not remain in the open position.
    (c) A liquid filled pressure-vacuum breaker may be used for vapor
overpressure and vacuum protection if the vessel owner or operator
obtains the prior written approval of the Commandant.
    (d) Vapor growth must be calculated following the Marine Safety
Center guidelines available in Coast Guard VCS guidance at http://homeport.uscg.mil, or as specifically approved in writing by the
Commandant after consultation with the Marine Safety Center.

Sec.  39.2013  High and low vapor pressure protection for tankships--T/
ALL.

    Each tankship with a vapor collection system must be fitted with a
pressure-

sensing device, located as close as practicable to the vessel vapor
connection, that measures the pressure in the main vapor collection
line, which--
    (a) Has a pressure indicator located on the tankship where the
cargo transfer is controlled; and
    (b) Has a high-pressure and a low-pressure alarm that--
    (1) Gives an audible and a visible warning on the vessel where the
cargo transfer is controlled;
    (2) Activates an alarm when the pressure-sensing device measures a
high pressure of not more than 90 percent of the lowest pressure relief
valve setting in the cargo tank venting system; and
    (3) Activates an alarm when the pressure-sensing device measures a
low pressure of not less than 0.144 pounds per square inch gauge (psig)
for an inerted tankship, or the lowest vacuum relief valve setting in
the cargo tank venting system for a non-inerted tankship.

Sec.  39.2014  Polymerizing cargoes safety--TB/ALL.

    (a) Common vapor headers for polymerizing cargoes must be
constructed with adequate means to permit internal examination of vent
headers.
    (b) Vapor piping systems and pressure-vacuum valves that are used
for polymerizing cargoes must be inspected internally at least
annually.
    (c) Pressure-vacuum valves and spill valves which are used for
polymerizing cargoes must be tested for proper movement prior to each
transfer.

Sec.  39.2015  Tank barge pressure-vacuum indicating device--B/ALL.

    A fixed pressure-sensing device must be installed as close as
practicable to the vessel vapor connection on a tank barge with a vapor
collection system. The pressure-sensing device must measure the
pressure vacuum in the main vapor collection line and have a pressure
indicator located where the cargo transfer is controlled.

Subpart 39.3000--Vapor Collection Operations During Cargo Transfer

Sec.  39.3001  Operational requirements for vapor control systems
during cargo transfer--TB/ALL.

    (a) Vapor from a tank vessel may not be transferred to a facility
in the United States, or vapor from a facility storage tank may not be
transferred to a tank vessel, unless the facility's marine vapor
control system (VCS) is certified by a certifying entity as meeting the
requirements of 33 CFR part 154, subpart P and the facility's facility
operations manual is marked by the local Coast Guard Captain of the
Port (COTP) as required by 33 CFR 154.325(d).
    (b) Vapor from a tank vessel may not be transferred to a vessel
that does not have its certificate of inspection or certificate of
compliance endorsed as meeting the requirements of this part and for
controlling vapor of the cargo being transferred.
    (c) For each cargo transferred using a vapor collection system, the
pressure drop through the vapor collection system from the most remote
cargo tank to the vessel vapor connection, including vapor hoses if
used by the vessel, must be--
    (1) Calculated at the maximum transfer rate and at lesser transfer
rates;
    (2) Calculated using a density estimate for the cargo vapor and air
mixture, or vapor and inert gas mixture, based on a partial pressure
(partial molar volumes) method for the mixture, assuming ideal gas law
conditions;
    (3) Calculated using a vapor growth rate as stated in 46 CFR
39.2011(d) for the cargo being transferred; and
    (4) Included in the vessel's transfer procedures as a table or
graph, showing the liquid transfer rate versus the pressure drop.
    (d) The rate of cargo transfer must not exceed the maximum
allowable transfer rate as determined by the lesser of the following:
    (1) Eighty percent of the total venting capacity of the pressure
relief valves in the cargo tank venting system when relieving at the
set pressure.
    (2) The total vacuum relieving capacity of the vacuum relief valves
in the cargo tank venting system when relieving at the set pressure.
    (3) For a given pressure at the facility vapor connection, or if
vessel-to-vessel transfer at the vapor connection of the service
vessel, then the rate based on pressure drop calculations at which the
pressure in any cargo tank connected to the vapor collection system
exceeds 80 percent of the setting of any pressure relief valve in the
cargo tank venting system.
    (e) Cargo tanks must not be filled higher than--
    (1) 98.5 percent of the cargo tank volume; or
    (2) The level at which an overfill alarm complying with 46 CFR
39.2007 or 39.2009(a)(2) is set.
    (f) A cargo tank should remain sealed from the atmosphere during
cargo transfer operations. The cargo tank may only be opened
temporarily for gauging or sampling while the tank vessel is connected
to a VCS as long as the following conditions are met:
    (1) The cargo tank is not being filled or no vapor is being
transferred into the cargo tank;
    (2) For cargo loading, any pressure in the cargo tank vapor space
is first reduced to atmospheric pressure by the VCS, except when the
tank is inerted;
    (3) The cargo is not required to be closed or restricted gauged by
46 CFR part 151, Table 151.05 or part 153, Table 1; and
    (4) For static accumulating cargo, all metallic equipment used in
sampling or gauging must be electrically bonded to the vessel and
remain bonded to the vessel until it is removed from the tank, and if
the tank is not inerted, 30 minutes must have elapsed after any cargo
transfer to the tank is stopped, before the equipment is put into the
tank.
    (g) For static accumulating cargo, the initial transfer rate must
be controlled in accordance with OCIMF ISGOTT Section 11.1.7
(incorporated by reference, see 46 CFR 39.1005), in order to minimize
the development of a static electrical charge.
    (h) If cargo vapor is collected by a facility that requires the
vapor from the vessel to be inerted in accordance with 33 CFR 154.2105,
the oxygen content in the vapor space of each cargo tank connected to
the vapor collection system must not exceed 60 percent by volume of the
cargo's minimum oxygen concentration for combustion (MOCC), or 8
percent by volume for vapor of crude oil, gasoline blends, or benzene,
at the start of cargo transfer. The oxygen content of each tank, or
each area of a tank formed by each partial bulkhead, must be measured
at a point 1.0 meter (3.28 feet) below the tank top and at a point
equal to one-half of the ullage.
    (i) If the vessel is equipped with an inert gas system, the
isolation valve required by 46 CFR 39.2001(e) must remain closed during
vapor transfer.
    (j) Unless equipped with an automatic self-test and circuit-
monitoring feature, each high-level alarm and tank overfill alarm on a
cargo tank being loaded, required by 46 CFR 39.2007 or 39.2009, must be
tested at the tank for proper operation within 24 hours prior to the
start of cargo transfer.

Subpart 39.4000--Vessel-to-Vessel Transfers Using Vapor Balancing

Sec.  39.4001  General requirements for vapor balancing--TB/ALL.

    (a) Vessels using vapor balancing while conducting a vessel-to-
vessel transfer operation, directly or through a shore loop, must meet
the requirements of this subpart in addition to the requirements of 46
CFR part 39,

subparts 39.1000, 39.2000, and 39.3000. Arrangements other than vapor
balancing used to control vapor emissions during a vessel-to-vessel
transfer operation must receive approval from the Commandant.
    (b) A vapor balancing operation must receive approval from the
Commandant to use a compressor or blower to assist vapor transfer.
    (c) Vapor balancing is prohibited when the cargo tanks on a vessel
discharging cargo are inerted and the cargo tanks on a vessel receiving
cargo are not inerted.
    (d) A vessel that intends to collect vapors (during a vessel-to-
vessel transfer operation) from cargoes not previously approved must
receive specific approval from the Commandant before beginning transfer
operations.

Sec.  39.4003  Design and equipment for vapor balancing--TB/ALL.

    (a) During transfer operations, if the cargo tanks are inerted on a
vessel discharging cargo to a receiving vessel with inerted cargo
tanks, the service vessel must--
    (1) Inert the vapor transfer hose prior to transferring cargo
vapor; and
    (2) Have an oxygen analyzer with a sensor or sampling connection
fitted within 3 meters (9.74 feet) of the vessel vapor connection
that--
    (i) Activates a visible and an audible alarm on the service vessel
where cargo transfer is controlled when the oxygen content in the vapor
collection system exceeds 60 percent by volume of the cargo's minimum
oxygen concentration for combustion (MOCC), or 8 percent by volume for
vapor of crude oil, gasoline blends, or benzene;
    (ii) Has an oxygen concentration indicator located on the service
vessel where the cargo transfer is controlled; and
    (iii) Has a connection for injecting a span gas of known
concentration for calibration and testing of the oxygen analyzer.
    (b) If the cargo tanks are not inerted on a vessel discharging
cargo during transfer operations, and the cargo is flammable or
combustible, the vapor collection line on the service vessel must be
fitted with a detonation arrester that meets the requirements of 33 CFR
154.2106, and be located within 3 meters (9.74 feet) of the vessel
vapor connection.
    (c) An electrical insulating flange or one length of non-conductive
hose must be provided between the vessel vapor connection on each
vessel operating a vessel-to-vessel cargo transfer.

Sec.  39.4005  Operational requirements for vapor balancing--TB/ALL.

    (a) During a vessel-to-vessel transfer operation, each cargo tank
being loaded must be connected by the vapor collection system to a
cargo tank that is being discharged.
    (b) If the cargo tanks on both the vessel discharging cargo and the
vessel receiving cargo are inerted, the following requirements must be
met:
    (1) Each tank on a vessel receiving cargo, which is connected to
the vapor collection system, must be tested prior to cargo transfer to
ensure that the oxygen content in the vapor space does not exceed 60
percent by volume of the cargo's minimum oxygen concentration for
combustion (MOCC), or 8 percent by volume for vapor of crude oil,
gasoline blends, or benzene. The oxygen content of each tank, or each
area of a tank formed by each partial bulkhead, must be measured at a
point 1 meter (3.28 feet) below the tank top and at a point equal to
one-half of the ullage;
    (2) Prior to starting transfer operations, the oxygen analyzer
required by 46 CFR 39.4003(a) must be tested for proper operation;
    (3) During transfer operations the oxygen content of vapors being
transferred must be continuously monitored;
    (4) Cargo transfer must be terminated if the oxygen content exceeds
60 percent by volume of the cargo's MOCC, or 8 percent by volume for
vapor of crude oil, gasoline blends, or benzene;
    (5) Transfer operations may resume once the oxygen content in the
tanks of the vessel receiving cargo is reduced to 60 percent by volume
or less of the cargo's MOCC, or 8 percent by volume or less for vapor
of crude oil, gasoline blends, or benzene; and
    (6) Prior to starting vapor transfer operations, the vapor transfer
hose must be purged of air and inerted.
    (c) The isolation valve located on the service vessel required by
46 CFR 39.2001(g) must not be opened until the pressure in the vapor
collection system on the vessel receiving cargo exceeds the pressure in
the vapor collection system on the vessel discharging cargo.
    (d) The vessel discharging cargo must control the cargo transfer
rate so that the transfer rate does not exceed--
    (1) The authorized maximum discharge rate of the vessel discharging
cargo;
    (2) The authorized maximum loading rate of the vessel receiving
cargo; or
    (3) The processing rate of the approved vessel vapor processing
system, if one is used to process the vapor collected during the
transfer operations.
    (e) The pressure in the vapor space of any cargo tank connected to
the vapor collection line on either the vessel receiving cargo or the
vessel discharging cargo must not exceed 80 percent of the lowest
setting of any pressure relief valve during ballasting or cargo
transfer.
    (f) Impressed current cathodic protection systems must be de-
energized during cargo transfer operations.
    (g) Tank washing is prohibited unless the cargo tanks on both the
vessel discharging cargo and the vessel receiving cargo are inerted, or
the tank is isolated from the vapor collection line.

Subpart 39.5000--Multi-breasted Loading Using a Single Facility
Vapor Connection

Sec.  39.5001  General requirements for multi-breasted loading--B/CLBR.

    (a) Each barge must be owned or operated by the same entity and
must have an approved vapor control system (VCS).
    (b) There must be only one crossover vapor hose and it must--
    (1) Comply with 46 CFR 39.2001(h) and (i);
    (2) Have a diameter at least as that of the largest pipe in the
outboard barge's VCS, and
    (3) If it extends more than 25 feet (7.62 meters) between the two
barges during the transfer operation, it must be as short as is
practicable, safe for the conditions, supported off the vessels' decks,
and its pressure drop calculations must be approved for its length by
the Marine Safety Center (MSC), or reapproved by the MSC if existing
approval was based on a 25-foot hose.
    (c) The hazards associated with barge-to-barge or barge-to-shore
electric currents must be controlled in accordance with sections 11.9
or 17.5 of OCIMF ISGOTT (incorporated by reference, see 46 CFR
39.1005).
    (d) The cargo transfer procedures must reflect the procedures to
align and disconnect a facility VCS to and from an inboard barge, and
alternately, to and from an outboard barge through the vapor cross-over
hose and the inboard barge's vapor header, or ``dummy'' header. This
must include proper connections for the facility VCS's alarm/shutdown
system to the alarm/shutdown system of the barge being loaded at the
time.
    (e) Calculations for multi-breasted loading must consider
additional pressure drops across the barges' vapor collection systems
and the cross vapor hose and must be reviewed and approved by the MSC
per 46 CFR 39.1017(a).

    (f) Barge owners and operators must comply with any additional
operational requirements imposed by the local Captain of the Port
(COTP) in whose zone the shore facility is located. These facilities'
VCSs must be certified for conducting such an operation.

Sec.  39.5003  Additional requirements for multi-breasted loading using
an inboard barge vapor collection system--B/CLBR.

    (a) Each barge must have at least one liquid overfill protection
system that fulfills the requirements of 46 CFR 39.2009.
    (b) The vapor header of an inboard barge that is used during
outboard barge loading must--
    (1) Be aligned with the vapor header of the outboard barge;
    (2) Have a diameter at least as large as the diameter of the
largest pipe in the vapor collection system of the outboard barge; and
    (3) Be marked in accordance with 46 CFR 39.2001(h).
    (c) A licensed tankerman, trained in and familiar with multi-
breasted loading operations, must be onboard each barge during transfer
operations. The tankerman serves as the barge person-in-charge (PIC).
During transfer operations, the barge PICs must maintain constant
communication with each other as well as with the facility PIC.
    (d) If multi-breasted loading will be conducted using more than one
liquid transfer hose from the shore facility, the facility must be
capable of activating the emergency shutdown system required by 33 CFR
154.550. This will automatically stop the cargo flow to each transfer
hose simultaneously, in the event an upset condition occurs that closes
the remotely operated cargo vapor shutoff valve in the facility's vapor
control system. Multi-breasted loading is prohibited unless the shore
facility can comply with this requirement.

Sec.  39.5005  Additional requirements for multi-breasted loading using
a ``dummy'' vapor header--B/CLBR.

    (a) Each inboard barge ``dummy'' header used during outboard barge
loading must--
    (1) Be aligned with the vapor header of the outboard barge;
    (2) Have a diameter at least as large as the diameter of the
largest pipe in the vapor collection system of the outboard barge;
    (3) Be marked in accordance with 46 CFR 39.2001(h); and
    (4) Meet the same design and installation requirements for the
vapor collection piping onboard the same barge.
    (b) Flanges must meet the same design and installation requirements
for flanges in the vapor collection system onboard the same barge.
    (c) A stud must be permanently attached, as required in 46 CFR
39.2001(j), to the vapor connection flange on the ``dummy'' header.

Subpart 39.6000--Tank Barge Cleaning Operations with Vapor
Collection

Sec.  39.6001  Design and equipment of vapor collection and stripping
systems--B/ALL.

    (a) Each barge engaged in cleaning operations at an approved
cleaning facility must have a conductive fixed stripping line installed
in each cargo tank. The line must extend to the low point of each cargo
tank, extend through and be welded to the top of the cargo tank, and
terminate above deck with a full port valve plugged at the open end.
    (b) An existing fixed stripping system may be used instead of the
stripping line required in paragraph (a) of this section.
    (c) Each stripping line must be labeled at an on-deck location with
the words ``Stripping Line-Tank'' followed by the tank's number, name,
or location.
    (d) Vapors may be collected from the barge's cargo tanks through a
common fixed vapor header, through the fixed liquid cargo header, or
through flanged flexible hoses located at the top of each cargo tank.
    (e) The vapor collection system must not interfere with the proper
operation of the cargo tank venting system.
    (f) A barge being gas-freed by a fluid displacement system must
fulfill the following requirements:
    (1) If the fluid medium is a compressible fluid, such as inert gas,
it must be injected into the barge's cargo tanks through a common fixed
vapor header, through the fixed liquid cargo header, or through a
flexible hoses flanged to a connection located at the top of each cargo
tank;
    (2) If the fluid medium is a non-compressible fluid, such as water,
it must be injected into the barge's cargo tanks through the fixed
liquid cargo header only; and
    (3) If the fluid medium is a non-compressible fluid, such as water,
the barge must be equipped with a liquid overfill protection
arrangement and fulfill the requirements for tank barge liquid overfill
protection contained in 46 CFR 39.2009.
    (g) The barge vapor connection must be electrically insulated from
the facility vapor connection and the fluid injection connection must
be electrically insulated from the fluid injection source, if fitted,
in accordance with OCIMF ISGOTT section 17.5 (incorporated by
reference, see 46 CFR 39.1005).
    (h) Vapor collection piping must be electrically bonded to the
barge hull and must be electrically continuous.
    (i) All equipment used on the barge during cleaning operations must
be electrically bonded to the barge and tested to ensure electrical
continuity prior to each use.
    (j) Hoses used for the transfer of vapors during cleaning
operations must meet the requirements of 46 CFR 39.2001(i) and have
markings as required in 46 CFR 39.2001(h).
    (k) Hoses used for the transfer of liquids during cleaning
operations must--
    (1) Have a designed burst pressure of at least 600 pounds per
square inch gauge (psig);
    (2) Have a maximum allowable working pressure of at least 150 psig;
    (3) Be capable of withstanding at least the maximum vacuum rating
of the cleaning facility's vapor-moving device without collapsing or
constricting;
    (4) Be electrically continuous with a maximum resistance of 10,000
ohms;
    (5) Have flanges with a bolthole arrangement complying with the
requirements for 150 pound class ANSI B16.5 flanges (incorporated by
reference, see 46 CFR 39.1005); and
    (6) Be abrasion and kinking resistant and compatible with the
liquids being transferred.
    (l) If a hose is used to transfer either vapor or liquid from the
barge during cleaning operations, hose saddles that provide adequate
support to prevent the collapse or kinking of hoses must accompany hose
handling equipment.

Sec.  39.6003  Overpressure and underpressure protection during
stripping or gas-freeing operations--B/ALL.

    (a) The volumetric flow rates during stripping or gas-freeing
operations must be limited within a range such that the cargo tank
venting system required by 46 CFR 32.55 will keep the cargo tank within
its maximum design working pressure or the maximum design vacuum.
    (b) Each barge must be fitted with a means for connecting the
pressure-sensing and pressure-indicating devices required by 33 CFR
154.2203(g) and (o) on each cargo tank top, or on the common vapor
header provided that pressures measured by the devices are adjusted to
compensate for the pressure drop across the vapor piping from the cargo
tank to the devices. The valve for the connection point must be labeled
``Pressure Sensor/indicator Connection.''

    (c) For stripping operations with closed cargo tanks, the maximum
stripping rate must not exceed the volumetric flow capacity of the
vacuum relief valve protecting the cargo tank.

Sec.  39.6005  Inspection prior to conducting gas-freeing operations--
B/ALL.

    (a) The following inspections must be conducted by the barge person
in charge prior to commencing gas-freeing operations, and show that--
    (1) Each part of the barge's vapor collection system is aligned to
allow vapor to flow to a cleaning facility's vapor control system
(VCS);
    (2) If a fluid displacement system is used to conduct gas-freeing
operations--
    (i) The fluid supply line is connected to the fluid injection
connection; and
    (ii) The maximum fluid injection rate is determined in accordance
with 46 CFR 39.6007(c)(2);
    (3) The maximum stripping or gas-freeing rate is determined in
accordance with 46 CFR 39.6003(c) or 39.6007(c), respectively, and
adequate openings required by 46 CFR 39.6007(c)(1) are available and
identified;
    (4) The pressure-sensing and pressure-indicating devices required
by 33 CFR 154.2203 are connected as required by 46 CFR 39.6003(b);
    (5) The maximum and minimum operating pressures of the barge being
cleaned are determined;
    (6) Unrepaired loose covers, kinks, bulges, gouges, cuts, slashes,
soft spots, or any other defects which would permit the discharge of
vapors through the vapor recovery hose material must be detected during
inspection and repaired prior to operation;
    (7) The facility vapor connection is electrically insulated from
the barge vapor connection and the fluid injection connection is
electrically insulated from the fluid injection source, if fitted, in
accordance with OCIMF ISGOTT section 17.5 (incorporated by reference,
see 46 CFR 39.1005); and
    (8) All equipment is bonded in accordance with 46 CFR 39.6001(h).

Sec.  39.6007  Operational requirements for tank barge cleaning--B/ALL.

    (a) During cleaning operations, vapors from a tank barge cannot be
transferred to a cleaning facility which does not have a marine vapor
control system (VCS) certified by a certifying entity, and its facility
operations manual endorsed by the Captain of the Port (COTP) as meeting
the requirements of 33 CFR part 154, subpart P.
    (b) Prior to commencing stripping operations, the maximum allowable
stripping rate must be determined. The maximum allowable stripping rate
must not exceed the volumetric flow capacity of the vacuum relief valve
protecting the cargo tank.
    (c) The maximum gas-freeing rate is determined by the following:
    (1) For a vacuum displacement system--
    (i) The maximum allowable gas-freeing rate is a function of the
area open to the atmosphere for the cargo tank being gas-freed. The
area open to the atmosphere must be large enough to maintain the
pressure in the cargo tank being gas-freed at or above 14.5 pounds per
square inch absolute (psia) (-0.2 pounds per square inch gauge (psig));
    (ii) The maximum allowable gas-freeing rate must be calculated from
Table 1 of this section, using the area open to the atmosphere for the
cargo tank being gas-freed as the entering determination;
    (2) For a fluid displacement system, the maximum allowable gas-
freeing rate is determined by the lesser of the following:
    (i) Eighty percent of the total venting capacity of the pressure
relief valve in the cargo tank venting system when relieving at its set
pressure;
    (ii) Eighty percent of the total vacuum relieving capacity of the
vacuum relief valve in the cargo tank venting system when relieving at
its set pressure; or
    (iii) The rate based on pressure drop calculations at which, for a
given pressure at the facility vapor connection, the pressure in the
cargo tank being gas-freed exceeds 80 percent of the setting of any
pressure relief valve in the cargo tank venting system.
    (d) Any hatch and/or fitting used to calculate the minimum area
required to be open to the atmosphere must be opened and secured in
such a manner as to prevent accidental closure during gas freeing. All
flame screens for the hatch and/or fitting opened must be removed in
order to allow for maximum airflow. The hatch and/or fitting must be
secured open before the pressure in the cargo tank falls below 10
percent of the highest setting of any of the barge's vacuum relief
valves.
    (e) ``Do Not Close Hatch/Fitting'' signs must be conspicuously
posted near the hatch and/or fitting opened during gas-freeing
operations.
    (f) To minimize the dangers of static electricity, all equipment
used on the barge during gas-freeing and cleaning operations must be
electrically bonded to the barge and tested to ensure electrical
continuity before each use.
    (g) If the barge is equipped with an inert gas system, the inert
gas main isolation valve must remain closed during cleaning operations.
    (h) Vapors from incompatible cargoes that are collected
simultaneously must be kept separated throughout the barge's entire
vapor collection system. Chemical compatibility must be determined in
accordance with the procedures contained in 46 CFR part 150, part A.

                              Table 1--Minimum Open Area for Barge Cleaning Hatches
----------------------------------------------------------------------------------------------------------------
                                           Air flow (CFS)                         Diameter
   Air flow (CFM)  (cubic feet/minute)      (cubic feet/        Open area          opening       Square opening
                                               second)       (square inches)      (inches)          (inches)
----------------------------------------------------------------------------------------------------------------
500.....................................               8.3              10.7               3.7               3.3
600.....................................              10.0              12.8               4.0               3.6
700.....................................              11.7              15.0               4.4               3.9