Sizing and flow

Size a water supply run from fixture units, developed length and available pressure.

1/2"–2" · IPC 604

Fall over a run at 1/8, 1/4 and 1/2 inch per foot, with the code minimum for the size.

1-1/4"–8" · IPC 704

Total WSFU and DFU for a fixture list, both codes side by side.

WSFU · DFU

Schedule 40 and CSST sizing by BTU load and longest length.

NFPA 54 · in. w.c.

Static head, elevation loss and friction loss to a PSI at the fixture.

PSI · ft head

Seconds to hot, gallons in the line and water run to drain, by pipe and flow.

Cu · PEX · CPVC · IPC 607.2