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

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

• A. Flow Hydrant
• B. Test Hydrant
• C. Normal Operating Pressure
• D. OS&Y

Answer: (B)

In hydrant fire-flow testing, you need to capture the system’s pressure both when no water is flowing (static) and while the required flow is being drawn (residual). The readings are taken at the hydrant designated as the test hydrant because it is specifically prepared for measurement with a pressure gauge and can be isolated from the rest of the network. By attaching a gauge to this hydrant, you can record the static pressure before any flow starts, then monitor the residual pressure while water is drawn through the test setup at the target flow. The flow hydrant is the source of the test flow, not the point where pressures are measured; OS&Y refers to a valve type on hydrants, and Normal Operating Pressure is a pressure value, not a hydrant. So the hydrant used to read static and residual pressures is the test hydrant.

In hydrant fire-flow testing, you need to capture the system’s pressure both when no water is flowing (static) and while the required flow is being drawn (residual). The readings are taken at the hydrant designated as the test hydrant because it is specifically prepared for measurement with a pressure gauge and can be isolated from the rest of the network. By attaching a gauge to this hydrant, you can record the static pressure before any flow starts, then monitor the residual pressure while water is drawn through the test setup at the target flow. The flow hydrant is the source of the test flow, not the point where pressures are measured; OS&Y refers to a valve type on hydrants, and Normal Operating Pressure is a pressure value, not a hydrant. So the hydrant used to read static and residual pressures is the test hydrant.