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19. Pipe sizing

Size domestic gas pipework (BS 6891): draw the runs from the meter to each appliance and see whether each one passes.

1. 1Setup

   Gas type, the units your appliance ratings are in, and the pressures. Start from scratch or from a ready-made layout.

   

2. 2Build

   The pipework as a diagram: the meter, each joint and each appliance, with the length of every run. Tap a run or an appliance to change it.

   

3. 3Calculate

   Each run is given its pipe size, and the worst path is checked against the 1 mbar allowed.

   

4. 4The details

   Every run with its size, flow and pressure loss. Export PDF to keep it with the job.

   GasPass shows the standard each answer comes from. Always check results against the current standard and the manufacturer's instructions.