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Anti-Vortex Plate – Section 4.16.10

When pump is in operation a vortex forms as the water level lowers, and without an anti-vortex plate, air will be introduced into the suction pipe. If this vortex were allowed to develop in a suction tank, it would result in turbulence in suction pipe and cause damage to the pump. To prevent this from happening, an anti-vortex plate is placed in the bottom of the tank and connected to suction pipe of the fire pump.

4.16.10* 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.