The Hydrant Flow Gauge is pre-calibrated to measure water flow from 2½"
hydrant nozzles in gallons per minute and pounds per square inch. It
will fit any 2½" nozzle opening without the use of tools. The Hydrant Flow Gauge is pre-calibrated to measure water flow from 2-1/2” hydrant nozzles in gallons per minute and pounds per square inch.
Gallons per minute are based on a .9 Coefficient. Use AWWA M17 or NFPA 192 for Pitot formulas if your Hydrant Nozzle is different. This device will fit any 2-1/2” Nozzle opening without the use of tools.
Click here for Flow Chart reflecting a 0.9 coefficient.
To operate, remove the 2½" hydrant nozzle cap. Clean the thread to remove
grease or foreign matter. Open hydrant to flush any debris from the barrel.
Shut down hydrant. Assemble on the top of the nozzle thread with the blade
parallel o flow. Select a thread, then tighten thumb screw to securely hold
assembly on nozzle. Open hydrant fully. Purge the air from the bleeder by
turning counterclockwise. After water flows from bleeder, retighten. Read
Note: Tube length and
gauge face are sized for 2½" only; use on other diameters will cause
inaccuracy. This unit performs a dynamic or kinetic test. This device
should not be used for a static test (see
for static test).
Due to the sensitive
nature of pressure gauges they are only warranted against defects in
materials and workmanship, until they are put into service.