Centrifugal pump to be prepared before starting to pay attention
Before starting the centrifugal pump need to pay attention to the following aspects:
a. Check before starting
Whether the name, model, main performance and filling quantity of lubricating oil meet the requirements of technical documents;
Bearing lubrication system, sealing system and cooling system is intact, the bearing oil, water is smooth;
Drive 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;
Pump, bearing, motor foundation anchor bolts are loose;
Pump work system valves or ancillary devices should be in the pump load minimum position, should close the exit control valve;
Point pump to see whether the impeller steering steering with the design, if inconsistent, impeller must completely stop turning, adjust the motor wiring, before starting.
b. Fill with water
Before starting the pump, the pump housing and suction pipe must be filled with water first, because the vacuum in the pump port can not be formed and maintained in the presence of air.
c. Warm pump
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.
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