1.1 Scope This procedure applies to the scope of the company within the IEJ centrifugal pumps , IJ corrosion pump, UHB wear-resistant mortar pump, IH salt water pump, IS water pump, HJ bleaching pump, AIX single-stage single suction centrifugal pump, APS single Level double suction centrifugal pump, S single-stage double suction pump, ALB centrifugal pump , IR centrifugal hot water pump maintenance and overhaul. 1.2 Structure Description Centrifugal pumps are: pump, pump cover, oval shell, impeller, mechanical seal, bearing seat and other components. 1.3 Centrifugal pump structure diagram: 1.3.1 Centrifugal pump icon: 1 Pump body 2 Impeller 3 Shaft 4 Bushing 5 Sealing ring 6 Pump cover