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Firefighting pump suction components - NFPA 20

Firefighting pump suction components


Firefighting pump suction components

Firefighting pump suction components

The suction components shall consist of all pipe, valves, and fittings from the pump suction flange to the connection to the public or private water service main, storage tank, or reservoir, and so forth, that feeds water to the pump.

Below we will explain the most important suction components

Valves

  • A listed outside screw and yoke (OS&Y) gate valve shall be installed in the suction pipe.
  • No control valve other than a listed OS&Y valve and the following devices shall be installed in the suction pipe within 50 ft (15.3 m) of the pump suction flange.

Devices in Suction Piping. 

  • Where located in the suction pipe of the pump, check valves and backflow prevention devices or assemblies shall be located a minimum of 10 pipe diameters from the pump suction flange.
  • Where a backflow preventer with butterfly control valves is installed in the suction pipe, the backflow preventer is required to be at least 50 ft (15.2 m) from the pump suction flange (as measured along the route of pipe).

Fittings

Elbows and tees

  • Elbows and tees with a centerline plane parallel to a horizontal split-case pump shaft shall not be permitted except where the distance between the flanges of the pump suction intake and the elbow and tee is greater than 10 times the suction pipe diameter. Some examples are shown in figures below:

Elbows and tees with a center line plane perpendicular to the horizontal split-case pump shaft shall be permitted at any location in the pump suction intake. Some examples are show below:

Eccentric Tapered Reducer or Increaser.

Where the suction pipe and pump suction flange are not of the same size, they shall be connected with an eccentric tapered reducer or increaser installed in such a way as to avoid air pockets as show in figure below:

Strain Relief.

Where the pump and its suction supply are on separate foundations with rigid interconnecting pipe,
the pipe shall be provided with strain relief, as shown in figure below:

Anti-Vortex Plate. 

Where a tank is used as the suction source for a fire pump, the discharge outlet of the tank shall be equipped with an assembly that controls vortex flow in accordance with NFPA 22 and as shown in figure below:











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