Do You Know The Skill Of Centrifugal Pump Maintenance

Do you know the skill of centrifugal pump maintenance´╝čIn practice, when dealing with faults, we should follow the principle of "first outside, then inside" according to specific problems and actual analysis, and do not operate blindly.


First of all: check the power supply: whether the connector is firmly connected; whether the switch contacts carefully; whether the fuse is blown; whether the three-phase power supply is lack of equality. In case of open circuit, poor contact, fuse fusing and phase loss, find out the cause and repair in time. Second: check whether it is the mechanical failure of the centrifugal pump itself.

centrifugal pump

Symptom 1: centrifugal water pump fails to start


Common causes: the packing is too tight or the impeller and pump body are blocked by sundries; the pump shaft, bearing and leakage reducing ring are rusted; the pump shaft is seriously bent, etc.


Troubleshooting: loosen the packing, dredge the water diversion channel; dismantle the centrifugal pump body to remove debris and rust; dismantle the centrifugal pump shaft to correct or replace the new pump shaft.


Symptom 2: insufficient flow


Causes: most of them are the air leakage of the suction pipe and the bottom valve; the water inlet  of centrifugal is blocked; the water inlet depth of the bottom valve is insufficient; the rotation speed of the centrifugal pump is too low; the seal ring or the impeller is too worn; the water absorption height exceeds the standard, etc.



Troubleshooting: check the suction pipe of centrifugal pump and the bottom valve to block the leaking gas source; clean up the sludge or blockage at the water inlet; the water inlet depth of the bottom valve must be greater than the diameter of the inlet pipe One point five Double, increase the water inlet of centrifugal pump depth of the bottom valve; check the power supply voltage, increase the rotation speed of the water pump, replace the sealing ring or impeller; reduce the installation position of the water pump, or replace the high lift water centrifugal pump.

Disease 3, no water

centrifugal pumps

Causes: there is air in the centrifugal pump body or air accumulated in the water inlet pipe, or the bottom valve is not closed tightly, the filling and water diversion are not enough, the packing of the vacuum pump leaks heavily, and the gate valve or flap valve is not closed tightly.


Exclusion method:


1. First put the water pressure up, then fill the centrifugal pump body with water, and then start the machine. At the same time, check whether the check valve is tight and whether the pipeline and joint have air leakage. If air leakage is found, apply lubricating oil or blending paint on the joint after disassembly, and tighten the screws.


2. Check the oil seal ring of the water centrifugal pump shaft, and replace it with a new one if it is seriously worn.


3. The pipeline leaks water or air. The nut may not be tightened whenthe centrifugal pump is installed. If the leakage is not serious, the place with air or water leakage can be coated with cement, or the cement slurry mixed with asphalt oil can be coated. Temporary repairs can be done with wet mud or soft soap. If there is water leakage at the joint, the nut can be tightened with a wrench. If there is serious water leakage, it is necessary to dismantle it again and replace the cracked pipe. Reduce the lift and press the pipe orifice of the centrifugal pump into the water 0.5m

slurry pump3


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