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» cental heating » sizing pipes  Sizing the pipes.  Once the
positions of the radiators and pipe runs have been determined,
the size of the pipes must be calculated. For this, the pipe
runs must be broken down into individual runs between radiators
etc. starting furthest from the boiler and working back towards
it.  downstairs raditors upstairs raditors  Starting with
lounge, the run between its radiator and the next in line (the
hall) must carry 4697 BTU. From the limiting factors, it is
estimated that 15mm copper pipe can handle 13,620 BTU; so 15mm
can easily cope. Then looking at the pipework for the hall and
lounge radiators, this has to carry the heat for both radiators
(2751 + 4687 = 7,438 BTU), so again 15mm pipe will cope. Further
back to the kitchen radiator gives a total of 9,791 BTU, so
again 15mm pipe can cope. This is the end of this particular
pipe run as the Dining Room radiator is on a separate run. The
requirement for the dining ro