This standard specifies the technical requirements, test methods, inspection rules and signs, packaging, transportation and storage of three-screw pumps. This standard applies to transporting lubricating oil, hydraulic oil, diesel oil, heavy oil (fuel oil) or lubricating oil liquids that do not contain solid particles, have a temperature of 0-150°C, and a viscosity of 3-760 mm2/s. Three-screw pump (hereinafter referred to as pump).