🚒 NFPA 291 2-Hydrant Test, Pitot Gauge PSI & Available Flow at 20 PSI Residual

NFPA 291 Fire Hydrant Flow Test Calculator

Calculate municipal water supply capacity for commercial fire sprinkler design under NFPA 291: calculate discharge flow (GPM = 29.83 x c x d² x √P) from 2-1/2" hydrant nozzles, residual pressure drop, and project available fire flow at 20 PSI residual pressure.

1. Project & Operating Inputs

Residual Hydrant Test Pressure Drop (Static PSI minus Residual PSI)

Total Measured Flow from Flowing Hydrants (GPM e.g. 1,400 GPM)

Customer Flow Testing & Hydraulic Report Fee ($)

Pitot Gauges, Diffuser, City Permitting & Tech Labor ($)

2. Financial Breakdown & Yield

NFPA 291 HYDRANT FLOW TEST

Turnkey Flow Test Profit

Fire Protection Testing Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost