This standard specifies the terms and definitions, models, basic parameters, requirements, test methods, inspection rules, marking, packaging and storage of general water-injection single-screw air compressors (hereinafter referred to as "single-screw air compressors"). This standard applies to general fixed and modified mobile single-screw air compressors with drive motor power of 7.5 kW~250 kW and rated exhaust pressures of 0.4 MPa, 0.7 (0.8) MPa, and 1.0 MPa. Single-screw air compressors with other pressure levels can refer to this standard.