This standard specifies a general-purpose double-suction centrifugal pump (hereinafter referred to as a pump) with a suction port diameter of 200-500 mm that handles fresh water at a temperature of 0 to 40°C and is a double-suction, horizontal shaft type, single-stage pump used up to a maximum operating pressure of 1.4 MPa. This specifies those that are directly connected to 50Hz or 60Hz 4-pole, 6-pole or 8-pole three-phase induction electric auxiliary equipment on a common pace by a flexible shaft joint.