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Pump repair

No water or few water out from pump:
1,Check the oulet pipe ,inlet pipe whether there is block in the pump ,remove the block.
2,Check the rotate direction of the motor,and is there open phase/default phase problem,adjust the direction of motor,fix electric wire.
3,Check the suction pipe,see if there is location leak air,tighten the seal surface,exhaust air. 
4,The pump is not filled with liquid,there is still air inside,open the air evacuation valve to fill the liquid of the pump.
5,Inlet supply is lack of liquid,the distance from liquid surface to pump is too long,the suction head lift will be declined if the pipe is too long,we usually design the suction pipe with sortest distance from liquid surface to pipe inlet.so,stop the pump system,exam and adjust the pipe.
6,The resistance of pipe net is very big,and the type of pump chosen is not fit.do not use too many pipe bends,and choose a type of pump fits the system.
The pump flow is very low:
1,Check the pump and pump system as the ways above.
2,Part of pipe and impeller is blocked,there is incrustation inside,valves are not opened completely.first remove the block and incrustation,open valves.
3,If the voltage is very low,choose a pump which can work in low voltage,and keep the voltage stably.
4,impeller is lossy,change a new impeller.
The power is too large:
1,Check the pump whether it is being used over it is rated power,adjust the flow,adjust valve.
2,If the suction head lift is too high,decline the suction head lift.
3,If the bearing is lossy,change a new bearing.
There is noise and shakes with pump system:
1,Check if the pipe net is fixed,tighten the pipe net.
2,Check if there is air in liquid,raise suction pressure to exhaust air.
3,Decrease the vacuum of pipe to prevent cavitation.
4,If the bearing is lossy,change a new bearing.
5.The motor is overload,and the motor temperature raises,adjust the motor,the solution is below.
Motor temperature raises and the motor is overload.
1,The flow is overload,adjust valve.
2,Moter running against something,check and remove the block.
3,Moter bearing is lossy,change a new bearing.
4,If the voltage is very low,choose a pump which can work in low voltage,and keep the voltage stably.
The pump leaks liquid.
1,Mechanical seal is lossy,change a new mechanical seal.
2,Check if there is air bell or crack in pump,if there is,change the pump.
3,The seal surface is not a smooth flat one,adjust the seal surface.
4,The bolt is untighten,tighten the bolt.


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