at which a barge may be stripped during cleaning operations prior to
the opening of any hatch and/or fitting in 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 or MOCC means the
lowest level of oxygen in a vapor or a vapor mixture that will support
combustion.
    Multi-breasted barge-loading operations are those in which barges
load side by side with the outboard barge's vapor collection system
connected to a facility vapor connection through the inboard barge, as
opposed to single-breasted operations involving a single barge.
    Multiple facility vapor collection system junction means the point
in the vapor collection system where two or more branch lines
originating from separate facility vapor connections are connected.
    New vapor control system means a vapor control system that is not
an existing vapor control system.
    Padded or partially inerted means the oxygen content of the vapor
space in a tank is reduced to below what is normally present in the
atmosphere by the addition of an inert gas such as nitrogen or carbon
dioxide, but not to the concentration that meets the definition of
``inerted'' in this section.
    Pig means any device designed to maintain a tight seal within a
cargo line while being propelled by compressed gas towards a cargo
tank, for the purpose of transferring residual cargo from the cargo
loading line to the cargo tank.
    Pre-transfer conference means the conference required by 33 CFR
156.120(w).
    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.
    Tank barge cleaning facility or TBCF means a facility used or
capable of being used to conduct cleaning operations on a tank barge.
    Transfer facility means a facility as defined in 33 CFR 154.105,
excluding tank barge cleaning or stripping facilities.
    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 facility 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 or VCS means an arrangement of piping and
equipment used to control vapor emissions collected to or from a vessel
and includes the vapor collection system and the vapor processing unit
or a tank.
    Vapor destruction unit means a vapor processing unit that destroys
cargo vapor by a thermal destruction method.
    Vapor dispersion unit means a vapor processing unit that releases
cargo vapor into the atmosphere through a venting system not located on
the tank vessel.
    Vapor processing unit means the components of a vapor control
system that recover, destroy, or disperse vapor collected from a
vessel.
    Vapor recovery unit means a vapor processing unit that recovers
cargo vapor by nondestructive means.
    Vessel vapor connection means the point in a vessel's fixed vapor
collection system where it connects to a vapor collection hose or arm.

Certifying Entities

Sec.  154.2010  Qualifications for acceptance as a certifying entity.

    To qualify for acceptance as a vapor control system (VCS)
certifying entity, the entity must demonstrate to the satisfaction of
the Commandant that it possesses the following minimum qualifications:
    (a) The ability to review and evaluate design drawings and failure
analyses for compliance to this subpart;
    (b) The knowledge of the applicable regulations of this subpart,
including the standards incorporated by reference;

    (c) The ability to monitor and evaluate test procedures and results
for compliance with the operational requirements of this subpart;
    (d) The ability to perform inspections and witness tests of bulk
liquid cargo-handling systems;
    (e) That the applicant is not controlled by an owner or operator of
a vessel or facility engaged in controlling vapor emissions;
    (f) That the applicant is not dependent upon Coast Guard acceptance
under this section to remain in business; and
    (g) That the person in charge of VCS certification is currently a
licensed professional engineer.

Sec.  154.2011   Application for acceptance as a certifying entity.

    (a) An applicant seeking Coast Guard acceptance as a certifying
entity of vapor control systems (VCSs) must submit a signed, written
application to the Commandant. The applicant's signature certifies that
the information in the application is true and that the applicant is
not dependent upon Coast Guard acceptance under this section to remain
in business and constitutes consent for the Coast Guard to verify any
information contained in the application, through personal examination
of persons named in the application, or otherwise. If an applicant
knowingly and willfully provides any false statement or
misrepresentation, or conceals a material fact in the application, the
application may be denied or terminated, and the applicant may be
subject to prosecution under the provisions of 18 U.S.C. 1001.
    (b) An application must include the following general information:
    (1) The name and address of the applicant, including subsidiaries
and divisions if applicable;
    (2) A description of the experience and qualifications of any
person who would review or test systems on behalf of the applicant,
showing that the person is familiar with or otherwise qualified to
implement Coast Guard VCS regulations; and
    (3) A letter from a facility owner or operator stating his or her
intent to use the services of the applicant to certify VCS
installations.
    (c) The Commandant reviews each application and either issues a
letter of acceptance as a certifying entity to the applicant, or
notifies the applicant that it is not accepted, and maintains a list of
currently accepted certifying entities that is available to the public
at http://homeport.uscg.mil.
    (d) The acceptance of a certifying entity may be terminated by the
Commandant for failure to review, inspect, or test a system properly in
accordance with this subpart.
    (e) A certifying entity may not certify a facility VCS if that
certifying entity was involved in the design or installation of the
system. ``Design or installation'' includes but is not limited to--
    (1) Performing calculations;
    (2) Providing chemical data;
    (3) Developing plans, specifications, and drawings;
    (4) Conducting failure analysis; and
    (5) Installing systems or components.
    (f) A certifying entity may not conduct the failure analysis of a
facility VCS it is certifying. The certifying entity may only point out
shortcomings shown by the failure analysis and may not propose changes
to correct the shortcomings.
    (g) A certifying entity may not certify the VCS of any vessel or
facility owner or operator that owns or has a controlling interest in
the certifying entity.

Certification, Recertification, and Operational Review

Sec.  154.2020  Certification and recertification--Owner/operator
responsibilities.

    (a) Prior to operating, a new vapor control system (VCS)
installation must be certified under 33 CFR 154.2023 by a certifying
entity as meeting the requirements of this subpart.
    (b) A certified VCS or a Coast Guard-approved VCS that was
operating prior to July 23, 1990 must be recertified by a certifying
entity under 33 CFR 154.2023 before it can--
    (1) Control vapors other than those for which it was originally
certified;
    (2) Receive vapors from vessels other than those for which it was
approved, if the VCS was in operation prior to July 23, 1990;
    (3) Operate under any changed design or configuration;
    (4) Operate as part of multi-breasted barge-loading operations, if
the VCS was not originally approved or certified for such operations;
or
    (5) Be connected to a tank vessel if a cargo line clearance system
is used to clear cargo in the cargo line back to the tank vessel.
    (c) Prior to operating a VCS to control vapor from a tank vessel
during cargo line clearing if a cargo line clearance system is used to
clear cargo in the cargo line back to the tank vessel, the cargo line
clearance system must be reviewed by a certifying entity as meeting the
requirements of 33 CFR 154.2104.
    (d) To apply for certification, the owner or operator of a facility
VCS must submit plans, calculations, specifications, and other related
information, including a qualitative failure analysis, to the
certifying entity. Suggested guidance for preparing qualitative and
optional quantitative failure analyses can be obtained from http://
homeport.uscg.mil. The analysis must demonstrate that--
    (1) The VCS can operate continuously and safely while controlling
cargo vapors to or from tankships or tank barges over the full range of
transfer rates expected at the facility;
    (2) The VCS has the proper alarms and automatic shutdown systems
required by this subpart to prevent an unsafe operation;
    (3) The VCS has sufficient automatic or passive devices to minimize
damage to personnel, property, and the environment if an accident were
to occur;
    (4) If a quantitative failure analysis is also conducted, the level
of safety attained is at least one order of magnitude greater than that
calculated for operating without a VCS; and
    (5) If a facility uses a cargo line clearance system to clear cargo
in the cargo line back to the tank vessel with the VCS connected, the
qualitative failure analysis must demonstrate that the cargo line
clearance system has at least the same levels of safety required by
paragraphs (d)(1), (d)(2), and (d)(3) of this section to prevent
overpressure of the vessel's cargo tanks and account for the
probability that the pig is destroyed during line-clearing operations.
    (e) The VCS owner or operator must maintain at the facility--
    (1) A copy of VCS design documentation, including plans, drawings,
calculations, and specifications for the VCS;
    (2) The facility operations manual, including the list of cargoes
that the facility is approved to vapor control; and
    (3) Any certification or recertification letter issued under 33 CFR
154.2023.

Sec.  154.2021  Operational review--Owner/operator responsibilities.

    (a) Each facility vapor control system (VCS) must undergo an
operational review by a certifying entity within three years of its
initial certification or last operational review, to ensure its proper
operation and maintenance.
    (b) The VCS owner or operator must coordinate with the certifying
entity and provide the entity with all necessary documentation and
records to conduct the operational review.
    (c) The VCS owner or operator must notify the Captain of the Port
(COTP) of

a scheduled operational review. The COTP, at his or her discretion, may
witness the operational review.
    (d) The VCS owner or operator must maintain, at the facility, the
latest operational review letter issued under 33 CFR 154.2023.

Sec.  154.2022  Certification, recertification, or operational review--
Certifying entity responsibilities, generally.

    (a) Before certifying or recertifying a facility vapor control
system (VCS), the certifying entity must--
    (1) Review all VCS design documentation, including plans, drawings,
calculations, specifications, and failure analysis, to ensure that the
VCS design meets the requirements of this subpart;
    (2) Review all chemical data in accordance with paragraph (c) of
this section, to confirm that the VCS is properly designed for
controlling each specific chemical vapor;
    (3) Conduct an initial onsite inspection to ensure that the VCS
installation conforms to the VCS plans, drawings, and specifications
reviewed;
    (4) Conduct onsite reviews and witness tests in accordance with
paragraph (d) of this section, to ensure the VCS's proper operation in
accordance with its design and compliance with applicable regulations
and the facility's operations manual;
    (5) Review, inspect, and witness tests of all design or
configuration alterations before recertifying a VCS that was certified
or approved for operation prior to July 23, 1990, to ensure that the
altered system complies with applicable regulations;
    (6) Review the VCS design in accordance with paragraph (e) of this
section, prior to recertifying the VCS for the control of additional
cargo vapors;
    (7) Review the VCS in accordance with paragraph (f) of this
section, prior to certifying or recertifying it to control vapors from
barge cargo tanks during multi-breasted barge-loading operations;
    (8) Review a cargo line clearance system as meeting the
requirements of 33 CFR 154.2104 if such a system is used to clear cargo
in the cargo line back to a tank vessel prior to certifying or
recertifying a VCS to control vapor from the tank vessel during cargo
line clearance operations; and
    (9) Review the facility operations manual to ensure that it meets
the requirements of 33 CFR 154.310(b).
    (b) In conducting an operational review to ensure that the VCS is
properly operating and maintained, the certifying entity must ensure,
at a minimum--
    (1) The completeness, currency, and accuracy of the facility
operations manual, training plans, and VCS test procedures;
    (2) Proper maintenance and operation of VCS components, through
visual inspection; and
    (3) That cargo transfer or tank-cleaning barge operational
procedures are properly followed and the VCS operates properly, through
observation of the initial stages of transfer or cleaning, including
24-hour pre-transfer tests required by 33 CFR 154.2150(b) or 33 CFR
154.2250(b), the pre-transfer conference, and initial system startup
procedures.
    (c) For each of the following, if applicable, the certifying
entity's review of chemical data must ensure that--
    (1) Each chemical's maximum experimental safe gap, minimum oxygen
concentration for combustion (MOCC), and upper and lower limits of
flammability have been correctly determined, which may be determined
using Coast Guard guidance available at http://homeport.uscg.mil;
    (2) Each detonation arrester used in the VCS is correct for each
chemical's maximum experimental safe gap;
    (3) Setpoints for each oxygen analyzer used in the VCS are correct
for each chemical's MOCC;
    (4) Setpoints for each oxygen or hydrocarbon analyzer used in the
VCS are correct for each chemical's upper or lower flammability limit;
    (5) Each vapor-controlled chemical is compatible with other
chemicals and with inerting, enriching, or diluting gases added to the
VCS per 46 CFR part 150, Table I and Table II;
    (6) Each vapor-controlled chemical is compatible with all VCS
components;
    (7) Each vapor-controlled chemical is listed in one of the
following: 46 CFR part 30, Table 30.25-1; 46 CFR part 151, Table
151.05; 46 CFR part 153, Table 1 and Table 2; or as specified in
writing by the Commandant;
    (8) The flash point for any cargo with a closed-cup flash point of
60 [deg]C (140 [deg]F) or higher is properly determined;
    (9) Any test program used for instrument testing and calibration
conforms with 33 CFR 154.2180 and 33 CFR 154.2181; and
    (10) Any calculation to determine the duration of purging required
by 33 CFR 154.2150(o) is correct.
    (d) The certifying entity must ensure--
    (1) That each alarm and shutdown, shown on the piping and
instrumentation diagrams and reviewed in the hazard analysis as part of
the system, responds properly, through simulation of emergency
conditions to activate the alarm or shutdown;
    (2) That maximum vacuum can be maintained at the maximum operating
conditions of any vapor-moving device, through testing of the vacuum
breaker;
    (3) That VCS shutdown occurs correctly, through the startup of the
VCS and tripping of each shutdown loop while the VCS is not connected
to a vessel;
    (4) That VCS startup, normal operation, and shutdown occur
properly, through witnessing the relevant portions of a test loading or
unloading of one vessel, or a test cleaning of one tank barge at a tank
barge cleaning facility; and
    (5) That the automatic liquid block valve successfully stops flow
of liquid to the vessel during a system shutdown, through witnessing
the relevant portions of a test loading or test cargo tank cleaning.
    (e) Prior to recertifying the VCS for the control of additional
cargo vapors, the certifying entity must review the VCS design to
ensure that, with respect to each additional vapor, the--
    (1) System complies with 33 CFR 154.2103(a) and (b) or 33 CFR
154.2203(a) and (b);
    (2) Inerting, enriching, or diluting system is adequate;
    (3) Vapor recovery or destruction unit is adequate;
    (4) Mechanical equipment and systems are suitable;
    (5) Vapor properties and characteristics are addressed, including
freezing point, polymerization potential, solubility, and cargo
compatibility;
    (6) VCS's failure analysis addresses any new hazards presented; and
    (7) Facility operations manual's VCS addendum has been modified to
list each additional vapor.
    (f) Prior to certifying or recertifying a VCS to control vapors
from barge cargo tanks during multi-breasted barge-loading operations,
the certifying entity must confirm that--
    (1) The overfill control system required by 33 CFR 154.2102 will
process a liquid overfill condition within any one cargo tank on each
barge;
    (2) If multi-breasted loading is conducted using more than one
liquid transfer hose from the shore facility, the facility is capable
of activating the emergency shutdown system required by 33 CFR 154.550,
and can 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 required by 33 CFR
154.2101(a);
    (3) The facility operations manual has been modified to include the
procedures for multi-breasted barge-loading operations; and

    (4) The facility operations manual describes how to make proper
connections, on the facility side, between the alarm and shutdown
systems of the VCS and of each barge being loaded.

Sec.  154.2023  Certification, recertification, or operational review--
Certifying entity documentation.

    (a) If the certifying entity is satisfied that the facility's vapor
control system (VCS) has successfully undergone the reviews,
inspections, and tests required by 33 CFR 154.2022(a) for certification
or recertification, and that the VCS will operate properly and safely,
the certifying entity must certify or recertify the VCS by issuing a
certification letter to the facility owner or operator, and by sending
copies of the letter to the Captain of the Port (COTP) and the
Commandant. The certification letter must refer by date to the
certifying entity's letter of acceptance issued under 33 CFR
154.2011(c), and must--
    (1) State that the facility complies with applicable regulations
and with its operations manual, and list any exemptions to the
applicable regulations that have been approved by the Coast Guard;
    (2) Report on all reviews, inspections, and tests undergone by the
VCS in accordance with 33 CFR 154.2022(a);
    (3) List all plans and drawings that were reviewed by the
certifying entity;
    (4) State if the VCS may control vapors from tank barges that are
required to have a shore-side, explosion-proof receptacle or an
overfill control system required by 33 CFR 154.2102(a) and (b); and
    (5) List all cargoes that the certifying entity approves for
control by the VCS.
    (b) If the certifying entity is satisfied that the facility's VCS
has successfully undergone the operational review required by 33 CFR
154.2022(b), the certifying entity must issue an operational review
letter to the facility owner or operator, and send copies of the letter
to the COTP and the Commandant. The operational review letter must--
    (1) List each item reviewed and inspected;
    (2) Describe the transfer or cleaning operation observed; and
    (3) Summarize the review's results.

Personnel

Sec.  154.2030  Transfer facilities.

    (a) Personnel in charge of a transfer operation using a vapor
control system (VCS) must have completed a training program covering
the particular VCS installed at the facility. As part of the training
program, personnel must be able to demonstrate, through drills and
display of practical knowledge, the proper VCS operational procedures
for normal and emergency conditions. The training program must cover
the following subjects:
    (1) Purpose of the VCS;
    (2) Principles of the VCS;
    (3) Components of the VCS;
    (4) Hazards associated with the VCS;
    (5) Coast Guard regulations in this subpart;
    (6) Operating procedures, including:
    (i) Transfer, testing, and inspection requirements;
    (ii) Pre-transfer procedures;
    (iii) Chemicals approved for collection;
    (iv) Material safety data sheet review;
    (v) Connection procedures;
    (vi) Startup procedures;
    (vii) Normal operating conditions and how to handle deviations from
normal conditions;
    (viii) Normal shutdown procedures; and
    (ix) Operating procedures for cargo line clearing if a cargo line
clearance system is installed in accordance with 33 CFR 154.2104; and
    (7) Emergency procedures.
    (b) Personnel overseeing VCS maintenance must be familiar with--
    (1) Inspection of detonation arresters; and
    (2) Procedures for equipment and instrumentation testing required
by 33 CFR 156.170(g).

Sec.  154.2031   Tank barge cleaning facilities.

    (a) In addition to complying with 33 CFR 154.2030, a tank barge
cleaning facility (TBCF) person in charge of a barge cargo tank-
cleaning operation that uses a vapor control system (VCS) must complete
a training program covering the particular systems installed at the
facility and on the barge. 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--
    (1) Satisfy the requirements of 33 CFR 154.2030(a)(1) through
(a)(7) and 33 CFR 154.2030(b) and cover--
    (i) Purpose, principles, components, and hazards associated with
stripping and gas-freeing;
    (ii) Special hazards associated with the accumulation and discharge
of static electricity; and
    (iii) Operating procedures, including pre-cleaning procedures, and
safeguards to prevent static electricity discharge.
    (b) In addition to the requirements contained in 33 CFR 154.710, no
person may serve, and the facility operator may not use the services of
anyone, as a facility person in charge of a cleaning operation unless
the person has been properly trained and certified by the facility with
a minimum of 60 hours of experience in cleaning operations.

Transfer Facilities--VCS Design and Installation

Sec.  154.2100  Vapor control system, general.

    (a) Vapor control system (VCS) design and installation must
eliminate potential overpressure and vacuum hazards, overfill 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) Vapor collection system pipe and fitting components must be in
accordance with ANSI B31.3 (incorporated by reference, see 33 CFR
154.106) with a maximum allowable working pressure (MAWP) of at least
150 pounds per square inch gauge (psig). Valves must be in accordance
with ANSI B16.34, 150 pound class (incorporated by reference, see 33
CFR 154.106). Flanges must be in accordance with ANSI B16.5 or B16.24,
150 pound class (both incorporated by reference, see 33 CFR 154.106).
The following components and their associated equipment do not have a
minimum specified MAWP, but must be constructed to acceptable
engineering standards and have the appropriate mechanical strength to
serve the intended purpose: Knockout drums, liquid seals, blowers/
compressors, flare stacks/incinerators, and other vapor processing
units.
    (c) All VCS electrical equipment must comply with NFPA 70
(incorporated by reference, see 33 CFR 154.106).
    (d) Any pressure, flow, or concentration indication required by
this part must provide a remote indicator on the facility where the
cargo transfer system and VCS are controlled, unless the local
indicator is clearly visible and readable from the operator's normal
position at the control stations.
    (e) Any condition requiring an alarm as specified in this part must
activate an audible and visible alarm where the cargo transfer and VCSs
are controlled.
    (f) For a VCS installed after [EFFECTIVE DATE OF FINAL RULE], an
alarm or shutdown must be activated if electrical continuity of an
alarm or shutdown sensor required by this subpart is lost.
    (g) The VCS piping surface temperature must not exceed 177 [deg]C

(350 [deg]F) or 70 percent of the auto-ignition temperature in degrees
Celsius of the vapors being transferred, whichever is lower, during
normal operations. This must be achieved by either separating or
insulating the entire VCS from external heat sources.
    (h) The VCS must be equipped with a mechanism to eliminate any
liquid condensate from the vapor collection system that carries over
from the vessel or condenses as a result of an enrichment process.
    (1) If a liquid knockout vessel is installed to eliminate any
liquid condensate, it must have--
    (i) A mechanism to indicate the level of liquid in the device;
    (ii) A high liquid level sensor that activates an alarm, meeting
the requirements of paragraph (e) of this section;
    (iii) 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 devices before carrying liquid over from
the vessel to the vapor-moving device. One sensor with two stages may
accomplish both this requirement and the requirement of paragraph
(h)(1)(ii) of this section; and
    (2) If a drip leg is used to eliminate any liquid condensate, a
mechanism to remove liquid from the low point.
    (i) Vapor collection piping must be electrically grounded and must
be electrically continuous.
    (j) If the facility handles inerted vapors of cargoes containing
sulfur, the facility must control heating from pyrophoric iron sulfide
deposits in the vapor collection line.
    (k) All VCS components, including piping, hoses, and gaskets, must
be suitable for use with the vapor in the VCS.

Sec.  154.2101  Requirements for facility vapor connections.

    (a) A remotely operated cargo vapor shutoff valve must be installed
in the vapor collection line between the facility vapor connection and
the nearest point where any inerting, enriching, or diluting gas is
introduced into the vapor collection line, or where a detonation
arrester is fitted. The valve must--
    (1) Close within 30 seconds after detection of a shutdown condition
of any component required by this subpart;
    (2) Close automatically if the control signal or electrical power
to the system is interrupted;
    (3) Activate an alarm meeting 33 CFR 154.2100(e) when a signal to
shut down is received from a component;
    (4) Be capable of manual operation or manual activation;
    (5) Have a local valve position indicator, or be designed so that
the valve position can be readily determined from the valve handle or
valve stem position; and
    (6) 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.
    (b) Except when a vapor collection arm is used, the first 1 meter
(3.3 feet) of vapor piping downstream of the facility vapor connection
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.
    (c) Each facility vapor connection flange face must have a
permanent stud projecting outward that is 12.7 millimeters (0.5 inch)
in 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.
    (d) Each hose that transfers 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 no less than 5 psig;
    (3) Be capable of withstanding at least a 2 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 flanges, ANSI B16.5 (incorporated by reference, see 33 CFR
154.106); and
    (ii) One or more 15.9 millimeter (0.625 inch) diameter holes in the
flange face, located midway between boltholes, and in line with the
bolthole pattern;
    (6) Be resistant to abrasion and kinking;
    (7) Be compatible with vapors being controlled; and
    (8) Have the last 1 meter (3.3 feet) of each end of the vapor hose
marked in accordance with paragraph (b) of this section.
    (e) Vapor hoses must be adequately supported to prevent kinking,
collapse, or contact with metal surfaces on the dock during loading or
offloading.
    (f) Fixed vapor collection arms must--
    (1) Meet the requirements of paragraphs (d)(1) through (d)(5) of
this section; and
    (2) Have the last 1 meter (3.3 feet) of the arm marked in
accordance with paragraph (b) of this section.
    (g) The facility vapor connection must be electrically insulated
from the vessel vapor connection in accordance with OCIMF ISGOTT
section 17.5 (incorporated by reference, see 33 CFR 154.106). In order
to prevent electrical arcing during connection and disconnection of the
transfer hose/arm, the transfer hose/arm must be fitted with an
insulating flange or a single length of non-conducting hose to ensure
electrical discontinuity between the vessel and facility. The
insulating flange/hose must not be electrically bypassed.
    (h) A vapor collection system, fitted with a gas injection system
that operates at a positive gauge pressure at the facility vapor
connection, must be fitted with a mechanism to prevent backflow of
vapor to the vessel's vapor collection system during loading.

Sec.  154.2102  Facility requirements for vessel liquid overfill
protection.

    This section does not apply to facilities collecting vapors emitted
from vessel cargo tanks while inerting the cargo tanks.
    (a) Each facility that receives cargo vapor from a tank barge that
is fitted with overfill protection, in accordance with 46 CFR
39.2009(a)(1)(iii), must provide a 120-volt, 20-amp explosion-proof
receptacle for the overfill protection system that meets--
    (1) NEMA WD-6 (incorporated by reference, see 33 CFR 154.106);
    (2) NFPA 70, National Electrical Code, 2002, Articles 410-57 and
501-12 (incorporated by reference, see 33 CFR 154.106); and
    (3) 46 CFR 111.105-9.
    (b) Each facility that receives cargo vapor from a tank barge that
is fitted with an intrinsically safe cargo tank level sensor system
complying with 46 CFR 39.2009(b), as a means of overfill protection,
must have an overfill control system on the dock capable of powering
and receiving an alarm and shutdown signal from the cargo tank level
sensor system that--
    (1) Closes the remotely operated cargo vapor shutoff valve required
by 33 CFR 154.2101(a) and activates the emergency shutdown system
required by 33 CFR 154.550 when--
    (i) A tank overfill signal is received from the barge; or
    (ii) Electrical continuity of the cargo tank level sensor system is
interrupted;
    (2) Activates an audible and visible alarm that warns barge and
facility personnel when a tank overfill signal, or an optional high-
level signal

corresponding to a liquid level lower than the tank overfill sensor
setting, is received from the barge;
    (3) Has a mechanism to test the alarms and automatic shutdown
systems electrically and mechanically before operating the vapor
control system (VCS);
    (4) Has suitable means, such as approved intrinsic safety barriers
able to accept passive devices, so that the overfill and optional alarm
circuits on the barge side of the overfill control system, including
cabling, normally closed switches, and pin and sleeve connectors, are
intrinsically safe;
    (5) Is labeled at the dock with the maximum allowable inductance
(in millihenrys) and capacitance (in microfarads) to be connected to
the facility overfill protection system as specified by the equipment
manufacturer; and
    (6) Has a female connecting plug for the tank barge level sensor
system with a five-wire, 16-ampere connector body meeting IEC 60309-1
and IEC 60309-2 (both incorporated by reference, see 33 CFR 154.106),
which is--
    (i) Configured with pins S2 (N) and R1 (L3) for the tank overfill
sensor circuit, pin G connected to the cabling shield, and pins N (L2)
and T3 (L1) reserved for an optional high-level alarm connection;
    (ii) Labeled ``Connector for Barge Overfill Control System''; and
    (iii) Connected to the overfill control system by a shielded
flexible cable.

Sec.  154.2103  Facility requirements for vessel 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's vapor control system (VCS) must have the capacity
for collecting cargo vapor at a rate of not less than the facility's
maximum liquid transfer rate for cargoes that are vapor controlled plus
the vapor growth for the cargoes and any inerting, diluting, or
enriching gas that may be added to the system. Vapor growth must be
considered as 25 percent of the cargo's true vapor pressure in pounds
per square inch absolute (psia) at 115 [deg]F, divided by the vapor
pressure of gasoline at 115 [deg]F (12.5 psia), unless there is
experimental data for actual vapor growth for turbulent transferring
under the most severe conditions for vapor growth. If the cargo is
transferred at temperatures above 115 [deg]F, the cargo's true vapor
pressure (in psia) at the transferring temperature must be used when
determining the vapor growth.
    (b) A facility 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 vessel's vacuum relief valves or exceeding 80 percent of
the lowest setting of any of the vessel's pressure relief valves for a
non-inerted tank vessel. A facility VCS also must be designed to
prevent the pressure in a vessel's cargo tanks from going below 0.2
pounds per square inch gauge (psig) or exceeding 80 percent of the
lowest setting of any of the vessel's pressure relief valves for an
inerted tank vessel. The system must sustain the pressure in the
vessel's cargo tanks within this range at any cargo transfer rate less
than or equal to the maximum transfer rate determined at the pre-
transfer conference.
    (c) The pressure measured at the facility vapor connection must be
corrected for pressure drops across the vessel's vapor collection
system, vapor collection hose or arm, and vapor line up to the location
of the pressure sensor.
    (d) The facility vapor connection must have a pressure-sensing
device that meets the installation requirements of paragraph (h) of
this section, which activates an alarm that meets 33 CFR 154.2100(e)
when the pressure at the facility vapor connection exceeds either--
    (1) The pressure corresponding to the upper pressure determined in
paragraph (b) of this section; or
    (2) A lower pressure agreed upon at the pre-transfer conference.
    (e) If a facility draws vapor from a vessel with a vapor-moving
device, the facility vapor connection must have a pressure-sensing
device, which activates an alarm meeting 33 CFR 154.2100(e) when the
pressure at the facility vapor connection falls below either--
    (1) The pressure corresponding to the lower pressure determined in
paragraph (b) of this section; or
    (2) A higher pressure agreed upon at the pre-transfer conference.
    (f) The facility vapor connection must have a pressure-sensing
device, independent of the device used to activate the alarm required
by paragraph (d) of this section, meeting the installation requirements
of paragraph (h) of this section, which activates the emergency
shutdown system required by 33 CFR 154.550 when the pressure at the
facility vapor connection exceeds the lower of the following:
    (1) A pressure corresponding to 90 percent of the vessel's lowest
pressure relief valve setting, corrected for pressure drops across the
vessel's vapor collection system, the vapor collection hose or arm, and
any vapor line up to the point where the pressure sensor is located;
    (2) A pressure corresponding to 90 percent of the setting of the
pressure relief valve at the facility vapor connection, if the facility
vapor connection is installed with a pressure relief valve; or
    (3) A lower pressure than the pressure in paragraphs (f)(1) and
(f)(2) of this section that is agreed upon at the pre-transfer
conference.
    (g) If a facility draws vapors from a vessel with a vapor-moving
device, the facility vapor connection must have a pressure-sensing
device, independent of the device used to activate the alarm required
by paragraph (e) of this section, which closes the remotely operated
cargo vapor shutoff valve required by 33 CFR 154.2101(a) when the
vacuum at the facility vapor connection is more than the higher (lesser
vacuum) of the following:
    (1) A vacuum corresponding to 90 percent of the vessel's highest
vacuum relief valve setting;
    (2) A vacuum corresponding to 90 percent of the setting of the
vacuum relief valve at the facility vapor connection, if the facility
vapor connection is installed with a vacuum relief valve; or
    (3) A lesser vacuum than the vacuum in paragraphs (g)(1) and (g)(2)
of this section that is agreed upon at the pre-transfer conference.
    (h) The pressure-sensing devices required by paragraphs (d) and (f)
of this section must be located in the vapor collection line between
the facility vapor connection and the following:
    (1) Any isolation valve, unless an interlock is provided that
prevents operation of the system when the isolation valve is closed;
and
    (2) Any components that could plug and cause a blockage in the
vapor line.
    (i) A pressure-indicating device must be provided that displays the
pressure in the vapor collection line between the facility vapor
connection and any isolation valve or any devices which could cause a
blockage in the vapor line.
    (j) If a facility draws vapor from the vessel with a vapor-moving
device capable of drawing more than 1 pound per square inch (psi)
vacuum, a vacuum relief valve must be installed in the vapor collection
line between the vapor-moving device and the facility vapor connection,
which--
    (1) Relieves at a predetermined pressure such that the pressure at
the facility vapor connection is maintained at or above 13.7 psia (-1
psig);

    (2) Has a relieving capacity equal to or greater than the capacity
of the vapor-moving device;
    (3) Has a flame arrester or flame screen fitted at the vacuum
relief opening; and
    (4) Has 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.
    (k) When a facility collects cargo vapor through an extensive
length of vapor piping before reaching the first pressure sensor and
vacuum relief valve, the vacuum relief valve may be set at a vacuum
greater than 1 psi vacuum, provided the pressure controls take into
account the pressure drop across the vessel's vapor collection system,
any vapor collection hoses, and the vapor piping as a function of the
actual transfer rate.
    (l) If the pressure in the vapor collection system can exceed 1.5
psig during a malfunction of a pressure regulator or control valve in
an inerting, enriching, or diluting system, a pressure relief valve
must--
    (1) Be located between where the inerting, enriching, or diluting
gas is introduced into the vapor collection system and the facility
vapor connection;
    (2) Relieve at the higher of the following two pressures:
    (i) A pressure such that the pressure at the facility vapor
connection does not exceed 1.5 psig; or
    (ii) The lowest pressure relief valve setting of vessels that
control vapors at the facility;
    (3) Have a relieving capacity equal to or greater than the maximum
capacity of the facility inerting, enriching, or diluting gas source
flowing through the failed pressure regulator or control valve, taking
into account the pressure drops across any flame arrester or discharge
piping fitted at the relief valve's discharge;
    (4) Have a flame arrester or flame screen fitted at the discharge
opening, if the design does not secure a minimum vapor discharge
velocity of 30 meters (98.4 feet) per second; and
    (5) Have been tested for relieving capacity in accordance with
paragraph <IP_ADDRESS> of API 2000.
    (m) The relieving capacity test required by paragraph (l)(5) of
this section must be carried out with a flame screen fitted at the
discharge opening if--
    (1) The design of the pressure relief valve does not secure a
minimum vapor discharge velocity of 30 meters (98.4 feet) per second;
and
    (2) The discharge is not fitted with a flame arrester.
    (n) A facility that collects vapors emitted from vessel cargo tanks
while inerting cargo tanks must--
    (1) Provide a pressure-sensing device that activates an alarm
meeting 33 CFR 154.2100(e) when the pressure of the inerting gas
exceeds either the pressure corresponding to the higher pressure
determined in paragraph (b) of this section or a lower pressure agreed
upon at the pre-transfer conference;
    (2) Provide a pressure-sensing device, independent of the device
required by paragraph (n)(1) of this section, which automatically stops
the flow of inerting, padding, or purging gas to the vessel when the
pressure of the inerting gas exceeds 90 percent of the lowest setting
of any pressure relief valve on the vessel; and
    (3) Locate the pressure-sensing devices required by paragraphs
(n)(1) and (n)(2) of this section in the inerting piping downstream of
any devices that could potentially isolate the vessel from the sensing
devices.

Sec.  154.2104  Cargo line clearance system.

    If a line clearance (pigging) system is used to clear cargo in the
cargo lines to the tank vessel while the vessel is connected to the
facility vapor control system (VCS), the pigging system must be
designed with the following safety features:
    (a) A bypass loop installed in the main liquid cargo line that
contains the pig-receiving device, through which all the liquid flow is
channeled during pigging operations. The pig must act as a seal to
separate the vessel from the compressed gas that is used to propel it
as the pig travels from the pig launcher to the pig-receiving device;
    (b) A mechanism for restricting liquid and gas flow so that the
vessel, personnel, and environment are not endangered. The compressed
gas flow capacity that this mechanism secures must not be more than 95
percent of the combined capacity of all vessel and facility VCS relief
valves located upstream of the facility's remotely operated cargo vapor
shutoff valve required by 33 CFR 154.2101(a);
    (c) An automatic shutoff valve, which closes on a high-pressure
signal from the pressure sensor required by 33 CFR 154.2103(f), located
in the liquid bypass loop downstream of the pig-receiving device;
    (d) An interlock with the main cargo line manual block valve so
that line-clearing operations cannot begin unless the main cargo line
manual block valve is closed; and
    (e) A means to detect arrival of the pig at the pig-receiving
device.

Sec.  154.2105  Fire, explosion, and detonation protection.

    This section applies only to facilities that control vapors of
flammable, combustible, or non-high flash point liquid cargoes.
    (a) A vapor control system (VCS) with a single facility vapor
connection that receives inerted cargo vapor from a vessel and
processes it with a vapor recovery unit must--
    (1) Be capable of inerting the vapor collection line in accordance
with 33 CFR 154.2107(a) before receiving the vessel's vapor and have at
least one oxygen analyzer, which satisfies the requirements of 33 CFR
154.2107(f)(1), (f)(2), (g), (h)(2), and (h)(3), sampling the vapor
concentration continuously at a point as close as practicable to the
facility vapor connection. The total pipe length between the analyzer
and the facility vapor connection must not exceed 6 meters (19.7 feet);
or
    (2) 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).
    (b) A VCS with a single facility vapor connection that receives
only inerted cargo vapor from a vessel and processes it with a vapor
destruction unit must--
    (1) Satisfy the requirements of paragraph (a)(1) of this section
and 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); or
    (2) Have an inerting system that meets the requirements of 33 CFR
154.2107.
    (c) A VCS with a single facility vapor connection that receives
vapor from a vessel with cargo tanks that are not inerted or are
partially inerted, and processes it 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); or
    (2) Have an inerting, enriching, or diluting system that meets the
requirements of 33 CFR 154.2107.
    (d) A VCS with a single facility vapor connection that receives
vapor from a vessel with cargo tanks that are not inerted or are
partially inerted, and processes the 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
    (2) Have an inerting, enriching, or diluting system that satisfies
the requirements of 33 CFR 154.2107.
    (e) A VCS with multiple facility vapor connections that receives
vapor from vessels with cargo tanks that carry inerted, partially
inerted, non-inerted, or combinations of inerted, partially inerted,
and non-inerted cargoes, and processes them 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).
    (f) A VCS with multiple facility vapor connections that receives
only inerted cargo vapor from vessels and processes it with a vapor
destruction unit must--
    (1) Satisfy the requirements of paragraph (a)(1) of this section
for each facility vapor connection and 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); or
    (2) Have an inerting, enriching, or diluting system that meets the
requirements of 33 CFR 154.2107.
    (g) A VCS with multiple facility vapor connections that receives
vapor from vessels with non-inerted or partially inerted cargoes, and
processes the 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
    (2) Have an inerting, enriching, or diluting system that meets the
requirements of 33 CFR 154.2107.
    (h) A VCS with multiple facility vapor connections that
simultaneously receives vapor from vessels with inerted, partially
inerted, and non-inerted cargoes, and processes the 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
    (2) Have an inerting, enriching, or diluting system that meets the
requirements of 33 CFR 154.2107; or
    (3) Have a base loading system that meets the requirements of 33
CFR 154.2107(m).
    (i) A VCS that uses a vapor balancing system in which cargo vapor
from a vessel or facility storage tank is transferred through the
facility vapor collection system to facility storage tanks or a vessel
must meet the requirements of 33 CFR 154.2110.
    (j) Each outlet of a VCS that vents to the atmosphere, except for a
discharge vent from a vapor destruction unit or relief valve installed
to comply with 33 CFR 154.2103(j) and (k) or 33 CFR 154.2203(e), (k),
and (l), must--
    (1) Have a detonation arrester located at the outlet; or
    (2) Have a flame arrester if--
    (i) The discharge vent stream's total flammable concentration is
proven to be less than 50 percent of the lower flammable limit at all
times by an outlet concentration analyzer for carbon beds, proof of
correct operating temperature for refrigeration systems, or proof of
scrubbing medium flow for scrubbers; and
    (ii) The proving devices in paragraph (j)(2)(i) of this section
close the remotely operated cargo vapor shutoff valve required in 33
CFR 154.2101(a) and shut down any vapor-moving device if operating
outside the conditions necessary to maintain the discharge vent non-
combustible.

Sec.  154.2106  Detonation arresters installation.

    This section applies only to facilities collecting vapors of
flammable, combustible, or non-high flash point liquid cargoes.
    (a) Each detonation arrester required by this part must be
installed with a minimum distance of 0.6 meters (2 feet) from the
arrester flange face to any pipe bend, shutoff valve, or other device
that restricts the flow area of the piping.
    (b) Detonation arresters must be installed in accordance with the
guidelines outlined in the arrester manufacturer's acceptance letter
provided by the Coast Guard.
    (c) Line size expansions in a straight pipe run must be no closer
than 120 times the pipe's diameter from the detonation arrester unless
the manufacturer has test data to show the expansion can be closer.

Sec.  154.2107  Inerting, enriching, and diluting systems.

    This section applies only to facilities that control vapors of
flammable, combustible, or non-high flash point liquid cargoes.
    (a) Before receiving cargo vapor, a vapor control system (VCS) that
uses a gas for inerting, enriching, or diluting must be capable of
inerting, enriching, or diluting the vapor collection line, at a
minimum of two-volume exchanges of inerting, enriching, or diluting
gas, downstream of the injection point.
    (b) A VCS that uses an inerting, enriching, or diluting system must
be equipped, except as permitted by 33 CFR 154.2105(a), with a gas
injection and mixing arrangement located as close as practicable to the
facility vapor connection. The total pipe length between the
arrangement and the facility vapor connection must not exceed 22 meters
(72.2 feet). The arrangement must be such that it provides complete
mixing of the gases within 20 pipe diameters of the injection point.
    (c) A VCS that uses an inerting or enriching system may not be
operated at a vacuum after the injection point unless--
    (1) There are no vacuum relief valves or other devices that could
allow air into the vapor collection system downstream of the injection
point, and pipe connections are flanged, threaded, or welded so no air
can leak into the VCS; or
    (2) An additional analyzer is used to monitor the downstream vapor
concentration and a mechanism is provided to inject additional inerting
or enriching gas.
    (d) A VCS that uses analyzers to control the amount of inerting,
enriching, or diluting gas injected into the vapor collection line must
be equipped with at least two analyzers. The analyzers must be
connected so that--
    (1) When two oxygen analyzers are used, the higher oxygen
concentration reading controls the inerting or enriching system and
activates the alarm and automatic shutdown system required by paragraph
(h), (j), or (k)(2) of this section;
    (2) When more than two oxygen analyzers are used, the majority pair
controls the inerting or enriching system and activates the alarm and
automatic shutdown system required by paragraph (h), (j), or (k)(2) of
this section;
    (3) When two hydrocarbon analyzers are used, the lower hydrocarbon
concentration reading controls the enriching system and activates the
alarm and automatic shutdown system required by paragraph (i) of this
section;
    (4) When more than two hydrocarbon analyzers are used, the majority
pair controls the enriching system and activates the alarm and
automatic shutdown system required by paragraph (i) of this section;
    (5) When two hydrocarbon analyzers are used, the higher hydrocarbon
concentration reading controls the diluting system and activates the
alarm

and automatic shutdown system required by paragraph (l) of this
section; and
    (6) When more than two hydrocarbon analyzers are used, the majority
pair controls the diluting system and activates the alarm and automatic
shutdown system required by paragraph (l) of this section.
    (e) A VCS that uses volumetric measurements to control the amount
of inerting, enriching, or diluting gas injected into the vapor
collection line must be equipped, except as permitted by paragraph (m)
of this section, with at least one analyzer to activate the alarms and
automatic shutdown systems required by this section.
    (f) Each oxygen or hydrocarbon analyzer required by this section
must--
    (1) Be installed in accordance with API 550 (incorporated by
reference, see 33 CFR 154.106);
    (2) Have a system response time of not more than one minute from
sample input to 95 percent of final stable value as tested per 33 CFR
154.2180 and 33 CFR 154.2181; and
    (3) Continuously sample the vapor concentration not more than 30
pipe diameters from the gas injection point.
    (g) A VCS must not use oxygen analyzers that operate at elevated
temperatures (i.e., zirconia oxide or thermomagnetic).
    (h) An inerting system must--
    (1) Supply sufficient inert gas to the vapor stream to ensure that
the oxygen concentration downstream of the injection point is
maintained at or below 60 percent by volume of the minimum oxygen
concentration for combustion (MOCC) for the specific combination of
cargo vapors and inert gas being processed, which may be determined by
using Coast Guard guidance available at http://homeport.uscg.mil;
    (2) Activate an alarm that satisfies the requirements of 33 CFR
154.2100(e) when the oxygen concentration in the vapor collection line
exceeds 60 percent by volume of the MOCC for the specific combination
of cargo vapors and inert gas being processed, which may be determined
by using Coast Guard guidance available at http://homeport.uscg.mil;
    (3) Close the remotely operated cargo vapor shutoff valve required
by 33 CFR 154.2101(a) and shut down any vapor-moving device when the
oxygen concentration in the vapor collection line exceeds 70 percent by
volume of the MOCC for the specific combination of cargo vapors and
inert gas being processed, which may be determined by using Coast Guard
guidance available at http://homeport.uscg.mil;
    (4) Have a detonation arrester and a mechanism to prevent the
backflow of flammable vapors installed between the combustion device
and the inert gas injection point, if a combustion device is used to
produce the inert gas; and
    (5) Have an alarm value in paragraph (h)(2) of this section that is
at least one percentage point less than the shutdown value in paragraph
(h)(3) of this section. If the analyzers used to measure oxygen
concentrations cannot accurately differentiate between the alarm value
and the shutoff value, the alarm value must be lowered until the
analyzers become operable.
    (i) An enriching system must--
    (1) Supply sufficient compatible hydrocarbon vapor to the vapor
stream to make sure that the total flammable concentration downstream
of the injection point is maintained either at or above 170 percent by
volume of the upper flammable limit or above the upper flammable limit
plus 10 percentage points, whichever is lower;
    (2) Activate an alarm that satisfies the requirements of 33 CFR
154.2100(e) when the total flammable concentration in the vapor
collection line either falls below 170 percent by volume of the upper
flammable limit or below the upper flammable limit plus 10 percentage
points, whichever is lower;
    (3) Close the remotely operated cargo vapor shutoff valve required
by 33 CFR 154.2101(a) and shut down any vapor-moving device when the
total flammable concentration in the vapor collection line either falls
below 150 percent by volume of the upper flammable limit or below the
upper flammable limit plus 7.5 percentage points, whichever is lower;
and
    (4) Have an upper flammable limit listed in paragraphs (i)(1),
(i)(2), and (i)(3) of this section which is either the cargo's upper
flammable limit or the enriching gas's upper flammable limit, whichever
is higher. Alternatively, the mixture's upper flammable limit, which
may be determined by using methods found in Coast Guard guidance
available at http://homeport.uscg.mil, may be used.
    (j) Oxygen analyzers may be used instead of hydrocarbon analyzers
in a VCS using an enriching system that receives cargo vapor only from
a vessel with non-inerted cargo tanks, providing that the analyzers--
    (1) Activate an alarm satisfying the requirements of 33 CFR
154.2100(e) when the oxygen concentration in the vapor collection line
exceeds a level corresponding to either a total flammable concentration
of 170 percent by volume of the upper flammable limit or the upper
flammable limit plus 10 percentage points, whichever yields a higher
oxygen concentration;
    (2) Close the remotely operated cargo vapor shutoff valve required
by 33 CFR 154.2101(a) and shut down any vapor-moving device when the
oxygen concentration in the vapor collection line exceeds a level
corresponding to either a total flammable concentration of 150 percent
by volume of the upper flammable limit or the upper flammable limit
plus 7.5 percentage points, whichever yields a higher oxygen
concentration;
    (3) Have an alarm value in paragraph (j)(1) of this section that is
at least one percentage point less than the shutdown value in paragraph
(j)(2) of this section. If the oxygen analyzers used to measure oxygen
concentrations cannot accurately differentiate between the alarm value
and the shutdown value, the alarm value must be lowered until the
analyzers become operable; and
    (4) Have an upper flammable limit listed in paragraphs (j)(1) and
(j)(2) of this section which is either the cargo's upper flammable
limit or the enriching gas's upper flammable limit, whichever is
higher. Alternatively, the mixture's upper flammable limit, which may
be determined by using methods found in Coast Guard guidance available
at http://homeport.uscg.mil, may be used.
    (k) An enriching system may be used in a VCS that receives inerted
cargo vapor from a vessel if--
    (1) Hydrocarbon analyzers are used to comply with paragraphs (i)(2)
and (i)(3) of this section; or
    (2) Oxygen analyzers are used, in which case the analyzers must--
    (i) Activate an alarm meeting 33 CFR 154.2100(e) when the oxygen
concentration in the vapor collection line exceeds 60 percent by volume
of the MOCC for the specific combination of cargo vapors and gases; and
    (ii) Close the remotely operated cargo vapor shutoff valve required
by 33 CFR 154.2101(a) and shut down any vapor-moving device when the
oxygen concentration exceeds 70 percent by volume of the MOCC for the
specific combination of cargo vapors and gases; and
    (3) The MOCC in paragraphs (k)(2)(i) and (k)(2)(ii) of this section
is either the cargo's MOCC or the enriching gas's MOCC, whichever is
lower. Alternatively, the mixture's MOCC, which may be determined using
Coast Guard guidance available at http://homeport.uscg.mil, may be
used.
    (l) An air dilution system must--
    (1) Supply a sufficient amount of additional air to the vapor
stream to keep the total flammable concentration downstream of the
injection point below

30 percent by volume of the lower flammable limit;
    (2) Activate an alarm that satisfies the requirements of 33 CFR
154.2100(e) when the total flammable concentration in the vapor
collection line exceeds 30 percent by volume of the lower flammable
limit; and
    (3) Close the remotely operated cargo vapor shutoff valve required
by 33 CFR 154.2100(a) and shut down any vapor-moving device when the
total flammable concentration in the vapor collection line exceeds 50
percent by volume of the lower flammable limit.
    (m) An enriching system may use a base loading method to control
the amount of enriching gas in a vapor collection system if--
    (1) The flow rate of enriching gas is determined by assuming the
vapor entering the facility vapor connection consists of 100 percent
air;
    (2) Two independent devices are used to verify the correct
enriching gas volumetric flow rate. One of the two devices must be a
flow meter;
    (3) One of the devices activates an alarm that satisfies the
requirements of 33 CFR 154.2100(e) when the amount of enriching gas
added results in a total flammable concentration in the vapor
collection line either below 170 percent by volume of the upper
flammable limit or below the upper flammable limit plus 10 percentage
points, whichever is lower;
    (4) The second device activates closure of the remotely operated
cargo vapor shutoff valve required by 33 CFR 154.2101(a) and shuts down
any vapor-moving device when the amount of enriching gas added results
in a total flammable concentration in the vapor collection line either
below 150 percent by volume of the upper flammable limit or below the
upper flammable limit plus 7.5 percentage points, whichever is lower;
and
    (5) The upper flammable limit in paragraphs (m)(3) and (m)(4) of
this section is either the cargo's upper flammable limit or the
enriching gas's upper flammable limit, whichever is higher.
Alternatively, the mixture's upper flammable limit, which may be
determined using Coast Guard guidance available at http://
homeport.uscg.mil, may be used.
    (n) For controlling vapors of different cargoes at multiple berths
while using enriching gas, the highest upper flammable limit or the
lowest MOCC of the cargo or enriching gas, whichever is applicable, is
used to determine the analyzer alarm and shutdown setpoints.
Alternatively, the mixture's upper flammable limit or MOCC, which may
be determined by using Coast Guard guidance available at http://
homeport.uscg.mil, may be used.
    (o) For controlling vapors of inert and non-inert cargoes at
multiple berths while using enriching gas--
    (1) The lowest MOCC of the cargo or enriching gas is used to
determine the analyzer alarm and shutdown setpoints at all berths.
Alternatively, the mixture's MOCC, which may be determined using Coast
Guard guidance available at http://homeport.uscg.mil, may be used; or
    (2) A base loading method meeting the requirements of paragraph (m)
of this section is used for all berths.

Sec.  154.2108  Vapor-moving devices.

    (a) Paragraphs (b) and (e) of this section apply only to facilities
collecting vapors of flammable, combustible, or non-high flash point
liquid cargoes.
    (b) Each inlet and outlet to a vapor-moving device that handles
vapor that has not been inerted, enriched, or diluted in accordance
with 33 CFR 154.2107 must be fitted with a detonation arrester;
however, the outlet detonation arrester may be omitted if the vapor-
moving device is within 50 times the pipe's diameter of the detonation
arrester required by 33 CFR 154.2109(a).
    (c) If the vapor is handled by a reciprocating or screw-type
compressor in the vapor collection system, the compressor must be
installed with indicators and audible and visible alarms to warn
against the following conditions:
    (1) Excessive gas temperature at the compressor outlet;
    (2) Excessive cooling water temperature;
    (3) Excessive vibration;
    (4) Low lube oil level;
    (5) Low lube oil pressure; and
    (6) Excessive shaft bearing temperature.
    (d) If the vapor is handled by a liquid ring-type compressor in the
vapor collection system, it must be installed with indicators and
audible and visible alarms to warn against the following conditions:
    (1) Low level of liquid sealing medium;
    (2) Lack of flow of the liquid sealing medium;
    (3) Excessive temperature of the liquid sealing medium;
    (4) Low lube oil level;
    (5) Low lube oil pressure, if pressurized lubricating system; and
    (6) Excessive shaft bearing temperature.
    (e) If the vapor is handled by a centrifugal compressor, fan, or
lobe blower in the vapor collection system, construction of the blades
or housing must be one of the following:
    (1) Blades or housing of nonmetallic construction;
    (2) Blades and housing of nonferrous material;
    (3) Blades and housing of corrosion resistant steel;
    (4) Ferrous blades and housing with one-half inch or more design
tip clearance;
    (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 shutdown condition
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, 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 approved 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), (a)(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 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);
    (3) Meet the overpressure and over-vacuum protection requirements
of 33 CFR 154.2103; and
    (4) For inert cargo systems, have at least one oxygen analyzer in
the vapor line that activates an alarm that satisfies the requirements
of 33 CFR 154.2100(e) when the oxygen concentration in the vapor line
exceeds 60 percent by volume of the minimum oxygen concentration for
combustion (MOCC) for the specific combination of cargo vapor and inert
gas, which may be determined using Coast Guard guidance available at
http://homeport.uscg.mil.
    (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 mechanism 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 [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) is connected to a
facility's main VCS serving other plant 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 a flame is detected on the detonation arrester
or a VCS shutdown condition occurs, or when the facility's marine VCS
is not in operation; and
    (3) A mechanism to prevent backflow of vapors to the marine vapor
line.
    (b) Vapors from plant 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) A facility that wants to connect a facility vapor line, which
collects vapor from other plant processing areas that are not related
to tank vessel operations, to a marine VCS, must receive approval in
writing from the Commandant.

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. 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 must comply with the following:
    (a) The VCS's equipment, hoses, piping, and all piping components,
including valves, flanges, and fittings, which must be of a type and
constructed out of materials suitable for use with alkylene oxide;
    (b) 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 (c) of this section; and
    (c) The VCS must be adequately cleaned in accordance with 33 CFR
154.2150(p) and recertified by a certifying entity 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 (c)(3) of this section, must be tested by
applying the test pressure 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 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 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 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 checked not more than 24 hours before each transfer to
make sure they are operating without constraint and to ensure that any
required flame screens or flame arresters 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 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 unless a cargo line
clearance (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 line-clearing operations;
    (2) Personnel performing the line-clearing operation must be
adequately trained on the specific line-clearing 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 line-clearing operations;
    (3) Line-clearing 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 line-clearing 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 and
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) VCS equipment and instrumentation must be tested as required by
33 CFR 156.170(g), with a representative of the COTP invited to witness
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.
    (r) 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 the outlet of the sampling probe and when
the same gas is introduced directly to the analyzer.
    (c) All analyzers used in a VCS must be safety system function
tested and tested for CE, CD, RT, and SSB, in accordance with 33 CFR
154.2181.
    (d) All pressure sensors/switches used in a VCS must be safety
system function tested and tested for 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 2 percent or better gas standard to
calibrate the analyzers; and
    (4) Use of a certified secondary 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 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] TP21OC10.004

                              Form 154.2181(b)(2)--Calibration Error Determination
----------------------------------------------------------------------------------------------------------------
                                                                                Difference
                                                    Calibration       Monitor    -------------------------------
                                                       Value         Response          Zero            Span
----------------------------------------------------------------------------------------------------------------
1--Zero                                           ..............  ..............  ..............  ..............
----------------------------------------------------------------------------------------------------------------
1--Span                                           ..............  ..............  ..............  ..............
----------------------------------------------------------------------------------------------------------------
2--Zero                                           ..............  ..............  ..............  ..............
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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] TP21OC10.005

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

                                  Form 154.2181(b)(3)--Switch Calibration Error

[GRAPHIC] [TIFF OMITTED] TP21OC10.006

    (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 seven
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 seven consecutive days using
the equations in paragraphs (b)(2) and (b)(3) of this section and Form
154.2181(c)(3) of this section.

                                                  Form 154.2181(c)(3)--Calibration Drift Determination
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                                                                               Reference Value                          Difference       Percent of RV
                           Day                                  Day/Time             (RV)          Monitor Value         (Error)            (Drift)
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Low-Level:                                                 .................  .................  .................  .................  .................
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High-Level:                                                .................  .................  .................  .................  .................
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    (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;
    (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.

                                         Form 154.2181(d)--Response Time

[GRAPHIC] [TIFF OMITTED] TP21OC10.007

    (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 154.2106: detonation arrester installation;
    (c) 33 CFR 154.2107: inerting, enriching, and diluting systems;
    (d) 33 CFR 154.2108: vapor-moving devices;
    (e) 33 CFR 154.2109: vapor recovery and vapor destruction units;
    (f) 33 CFR 154.2111: VCS connected to a facility's main VCS;

    (g) 33 CFR 154.2112: special requirements for vapors with the
potential to polymerize or freeze; and
    (h) 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 (a)(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
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 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); 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
    (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).
    (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
    (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
(c)(3) of this section, must be tested by applying the test pressure 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 required by 33 CFR 154.2105(j) and 154.2107(d)
and (e), except as exempted by paragraph (c)(5) of this section, must
be checked for calibration response by use of 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(d)
and (e) may be checked for calibration response by use of 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 checked not more than 24 hours before each cleaning
operation to make sure they are operating without constraint and that
any required flame screens or flame arresters 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 does 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) A vapor collection system must not be used unless the following
tests and inspections are completed to the satisfaction of the facility
person in charge:
    (1) Each vapor collection hose, vapor collection arm, pressure or
vacuum relief valve, and pressure sensor is tested and inspected in
accordance with 33 CFR 156.170(b), (c), and (f);
    (2) Each remote operating or indicating device is tested for proper
operation in accordance with 33 CFR 156.170(f); and
    (3) Each required detonation arrester has been inspected internally
within the last year, or more frequently if operational experience has
shown that frequent clogging or rapid deterioration is likely.
    (f) If one or more analyzers required by 33 CFR 154.2107(d) and (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 B to Part 154 [Removed and Reserved]

    10. Remove and reserve Appendix B to part 154.