13.4.9.1 Positive Displacement Pumps

Whenever a critical path component in a positive displacement fire pump is replaced, as defined in 14.5.2.5 of NFPA 20, a field test of the pump shall be performed. [20:14.5.1.1]

If components that do not affect performance are replaced, such as shafts, then only a functional test shall be required to ensure proper installation and reassembly. [20:14.5.1.2]

If components that affect performance are replaced, such as rotors, plungers, and so forth, then a retest shall be conducted by the pump manufacturer or designated representative or qualified persons acceptable to the AHJ. [20:14.5.1.3]

For water mist positive displacement pumping units, the retest shall include the pump unit as a whole. [20:14.5.1.3.1]

The field retest results shall be compared to the original pump performance as indicated by the fire pump manufacturer's original factory-certified test curve, whenever it is available. [20:14.5.1.4.1]

The field retest results shall meet or exceed the performance characteristics as indicated on the pump nameplate, and the results shall be within the accuracy limits of field testing as stated elsewhere in NFPA 20. [20:14.5.1.4.2]