This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of diaphragm compressors for pressurized water reactor nuclear power plants (hereinafter referred to as diaphragm compressors). This standard is applicable to diaphragm compressors with a rated exhaust pressure not greater than 15 MPa and a nominal volumetric flow rate not greater than 55 m (standard)/h. Diaphragm compressors beyond this range can be implemented as a reference.