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Discharge Pressure Gauge – 4.12.1

Gauges are used to measure pressure on both sides of the fire pump when in operation and during the regularly scheduled nonflow testing required by NFPA 25. The gauges should be of sufficient quality to provide a reasonably accurate pressure reading, since they are used for testing purposes on a weekly and sometimes annual basis. These gauges should be calibrated each year to maintenance accuracy.

The discharge pressure gauge provides the pump operator ability to observe the discharge pressure exerted from the fire pump.

4.12.1.1 A pressure gauge having a dial not less than 3.5 in. (89 mm) in diameter shall be connected near the discharge casting with a nominal 0.25 in. (6 mm) gauge valve.

4.12.1.2 The dial shall indicate pressure to at least twice the rated working pressure of the pump but not less than 200 psi (13.8 bar).

4.12.1.3 The face of the dial shall read in bar, pounds per square inch, or both with the manufacturer’s standard graduations