This standard specifies the type and performance parameters, technical requirements, test methods, inspection rules, signs, packaging, transportation and storage of three-screw pumps. This standard is applicable to transporting lubricating oil, hydraulic oil, diesel oil, heavy oil (fuel oil) or similar lubricating oil at a temperature of 0-150°C and a viscosity of 3-760mm2/s without solid particles. Screw pump (hereinafter referred to as pump).