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General requirements of pressure gauge - NFPA 20

General Requirements of Pressure Gauge According to NFPA 20


General Requirements of Pressure Gauge According to NFPA 20
General Requirements of Pressure Gauge According to NFPA 20

suction & discharge gauges are used to measure pressure on both sides of the fire pump where in operation and during the regularly scheduled nonflow testing required by NFPA 25.


Discharge Gauge Requirements:

  • The dial is not less than 3.5 inch diameter with a nominal 0.25 inch gauge valve.
  • Pressure range at least twice the rated working pressure of the pump but not less than 200 psi (13.8 bar).
  • Units: bar, pounds per square inch, or both with the manufacturer's standard graduations.

Suction Gauge Requirements:

  • The dial is not less than 3.5 in. diameter with a nominal 0.25 in. (6 mm) gauge valve.
  • Pressure range of two times the rated maximum suction pressure of the pump.
  • Units: inches of mercury (millimeters of mercury) or psi (bar) for the suction range. Note that: This requirement shall not apply to vertical shaft turbine–type pumps taking suction from a well or open wet pit.
  • Note that: Where the minimum pump suction pressure is below 20 psi (1.3 bar) under any flow condition, the suction gauge shall be a compound pressure and vacuum gauge.


References of this article:

NFPA 20 - 2019 edition (Standard for the installation of stationary pumps for fire protection)

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