Before starting the centrifugal pump need to pay attention to the following aspects: a. Check before the start of the lubricant name, model, the main performance and the number of filling the technical documents are required; bearing lubrication system, sealing system and cooling system is intact, Bearing oil, water is smooth; disk pump rotor 1 ~ 2 turn, check the rotor for friction or stuck phenomenon; in the vicinity of the coupling or belt guard, etc., there is no impeding the rotation of the debris; pump , The bearing base, the motor foundation anchor bolts are loose; pump working system valves or ancillary devices should be in the pump load minimum position, the outlet valve should be closed; point pump to see if the impeller steering and design steering Consistent, if inconsistent, impeller must completely stop turning, adjust the motor wiring, before starting. b. Filling the water pump Prior to start-up, the pump housing and suction pipe must be filled with water, because of the presence of air, the suction port vacuum can not be formed and maintained. c. Warm pumps Pumps that deliver hot liquids, such as boiler feed pumps in power plants, must be warmed up before starting. This is because when the feed water pump is started, the high-temperature feed water flows through the pump, causing the temperature of the pump body to rise quickly from room temperature to 100-200 ° C, which causes the temperature difference between the inside and outside of the pump and between the components. If there is not enough Heat transfer time and appropriate measures to control the temperature rise will cause uneven expansion of the pump around, resulting in deformation of the various parts of the pump, wear, vibration and axle suspension accidents.