Centrifugal pump before the start of preparation a. Check the name of the centrifugal pump before starting, type, main performance and the number of filling is in line with technical documentation requirements; bearing lubrication system, sealing system and cooling system is intact, the bearing oil circuit , The waterway is smooth; the pump rotor 1 ~ 2 turn, check the rotor for friction or stuck phenomenon; in the vicinity of the coupling or belt guard, etc., whether there is interference with rotation of debris; pumps, housings, Motor foundation bolts are loose; pump working system valves or ancillary devices should be in the minimum load pump operation position, should close the exit control valve; point pump to see if the impeller steering steering with the design, if inconsistent , It is necessary to completely stop the impeller rotation, adjust the motor wiring, before starting again. b. Centrifugal Pump Water Filling Pump Prior to start-up, the pump housing and suction hose must be completely filled with water because vacuum in the pump suction port can not be formed and maintained in the presence of air. c. Centrifugal Pumps Centrifugal pumps for transporting hot liquids, such as boiler feed pumps for 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.
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