Single-hydrant flow test
The information derived from this test is used by the fire service to plan for fighting fires. If all hydrants in a system are tested, partially closed valves and other obstructions will become known. This test uses a single hydrant as both the test hydrant and the flow hydrant.
1. Attach gauge cap.
2. Attach hydrant slow-close gate valve and tighten all other caps.
3. Set the Little Hose Monster™ with Pitotless Nozzle™ in an appropriate location for flowing water.
4. Attach hose to Pitotless Nozzle and Little Hose Monster assembly.
5. Attach Remote Reader assembly and gauge to Pitotless Nozzle.
Conduct the test
1. Slowly open the hydrant using the gauge cap to purge air from the hydrant. Close it when air is vented.
2. Record static pressure from gauge cap.
3. Fully open hydrant gate valve.
4. When the flow-rate stabilizes,
a. Record nozzle pressure from the remote reader.
b. Record the residual pressure reading from the gauge cap.
At this point, the test is complete.
5. Close gate valve, close hydrant. Remove test equipment. Tighten cap. If the hydrant is a dry barrel type, note that water drains properly from the hydrant. Remove Remote Reader and gauge from the Pitotless Nozzle.
6. Record the number of minutes that water was flowing. This can be used to account for the amount of water used during the flow test.