How are engines and motors sized for fire pumps?
A. Motors and engines supplied with Aurora fire pumps are sized according to U.L., F.M. and NFPA 20 (2003), and are designed to operate on any point of the fire pump curve without exceeding the motor nameplate service factor, or engine size. Do not be fooled into thinking that the motors are sized only to 150% of nameplate capacity. It is not uncommon for fire pumps to operate well beyond 150% of rated capacity (for example, if there is an open hydrant or broken pipe downstream). For more specifics, please refer to NFPA 20 (2003) paragraphs 9.5.2.1, 11.2.2.7, UL-448 paragraph 24.8, and Factory Mutual’s Approval Standard for Split Case Fire Pumps, Class 1311, paragraph 4.1.2. All motors and engines supplied with Aurora fire pumps are sized to the true intent of NFPA 20, U.L. , and Factory Mutual.
