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Concentric Increaser (Pump Discharge) – 4.17.6

A Concentric increaser is used on the discharge side of a fire pump assembly to match with the required pipe size mentioned in table 4.28. In most pump installations, the discharge pump opening is smaller than the required pipe size according to table 4.28; If the discharge pipe is the same size as the pump discharge flange, an increaser is not required.

4.17.6* The size of pump discharge pipe and fittings shall not be less than that given in Section 4.28.