Which hydrant is used during a fire-flow test to read static and residual pressures?

Which hydrant is used during a fire-flow test to read static and residual pressures?

• A. Test hydrant
• B. Flow hydrant
• C. Dead-end hydrant
• D. Loop hydrant

Answer: (A)

In a fire-flow test, you need a fixed point to measure water pressure before and during the test. The hydrant designated as the test hydrant is where you attach a pressure gauge and read the static pressure with no flow, then read the residual pressure while water is flowing from the system. The test hydrant serves as the measurement point, while another hydrant—the flow hydrant—is opened to produce the required flow. The remaining hydrants describe other roles in the network (end of line or loop) and are not used for taking the pressure readings during the test. This setup isolates the pressure readings from the source of the flow and gives a clear picture of how the system performs under demand.

In a fire-flow test, you need a fixed point to measure water pressure before and during the test. The hydrant designated as the test hydrant is where you attach a pressure gauge and read the static pressure with no flow, then read the residual pressure while water is flowing from the system. The test hydrant serves as the measurement point, while another hydrant—the flow hydrant—is opened to produce the required flow. The remaining hydrants describe other roles in the network (end of line or loop) and are not used for taking the pressure readings during the test. This setup isolates the pressure readings from the source of the flow and gives a clear picture of how the system performs under demand.