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General failures and treatments of centrifugal pump(I)

1. Pump can not be started or boot load is large 

Causes and treatment methods are as follows:

(1) The prime mover or power is not normal. Approach is to check the power supply and the prime mover circumstances.

(2) Pump stuck. Approach is dynamic coupling plate by hand to check if necessary, checking the disintegration eliminate static and dynamic part of the fault.

(3) Packing too tight. Treatment is relaxing filler.

(4) The discharge valve is not closed. Approach is closed discharge valve, restart.

(5) The balance pipe is not smooth. Approach is to clear the balance pipe.

2. The pump does not drain

Causes and treatment methods are as follows:

(1) Lack of irrigation pump (or pump gas is not drained). Approach is to re-prime the pump.

(2) Pump turn is not right. Approach is to check the direction of rotation.

(3) The pump speed is too low. Approach is to check the speed, increase speed.

(4) Filter is clogged, the bottom valve is not working. Approach is to check the filter, to eliminate debris.

(5) On the suction height is too high, or a vacuum suction tank. Approach is to reduce the suction height; check the suction tank pressure.

3. Interruption after draining

Causes and treatment methods are as follows:

(1) The suction line leak. Approach is to check the side pipe joints and sealing situation of stuffing box .

(2) The suction side of the gas is not drained when the pump is irrigating. Approach is asked to re-prime the pump.

(3) The suction side suddenly is blocked by foreign body. Treatment is to stop the pump and handle foreign body.

(4) Inhalation of large amounts of gas. Approach is to check whether there is a vortex inlet, submerged depth is too shallow.