Fire pumps are critical components of water-based fire protection systems, providing vital water supplies to keep buildings and their occupants safe during a fire emergency. As such, they must be designed, installed and maintained according to strict regulations and standards, including those set by the National Fire Protection Agency (NFPA) 20 and Underwriters Laboratories (UL).
Whether used for filling fire engine containers, dewatering or emergency irrigation, a floating motor pump is a vital tool of rescue services. Their small dimension and optimum capacity make them popular among firemen, but also municipal service workers, foresters and builders – everywhere that pumping of water is needed. They can be operated anywhere, even without access to electricity power, thanks to combustion engines.
A fire pump’s shaft must withstand high torque and hydraulic loads, requiring careful consideration of its diameter and material to avoid failure. Both UL and FM guidelines require that the maximum shear stress, as well as the maximum torsional shearing stress, not exceed 30% of the tensile yield strength of the pump shaft material.
Fire pumps are also required to have a casing that’s easy to disassemble, so they can be easily cleaned and inspected. The casing should be constructed with drain openings to facilitate removing the suction line and any internal components for maintenance. In addition, flanges on the pump discharge and suction sides should comply with ANSI B16.1 to ensure compatibility with any connecting pipes or fittings. Finally, the pump must be capable of operating at a minimum net pressure of 40% of its stated capacity. floating fire pump