This standard specifies the performance grade evaluation indicators, other requirements, test methods, inspection rules and performance grade marks of small gasoline engine direct-coupled high-speed centrifugal pumps. This standard applies to small gasoline engine direct-coupled high-speed centrifugal pumps (hereinafter referred to as pumps) with a rated power ≤ 5.89 kW and a speed of 3 600 r/min or above.