Standpipe System Design Calculator

Standpipe class and sizing from building height and use.

Standpipe class

Building height (ft)

Number of floors

Number of standpipes

Hazen-Williams C factor

Riser pipe diameter (in)

Tab to move between fields

Total system flow (GPM)

750

Total pressure needed (PSI)

146.6

Residual pressure (PSI)100

Static head loss (PSI)32.5

Friction loss (PSI)14.1

Pipe velocity (ft/s)19.1

Velocity acceptableNo

Min riser diameter (in)4

Total hose connections10

Friction loss (PSI/ft)0.16

How to Use This Calculator

Enter Standpipe class, Building height (ft), and Number of floors.
Set Number of standpipes, Hazen-Williams C factor, and Riser pipe diameter (in).
Review Total system flow (GPM) and Total pressure needed (PSI).
Use Residual pressure (PSI) and Static head loss (PSI) to inform your decision.

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