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General failures and treatments of centrifugal pump(II)

1.The lack of traffic

Causes and treatment methods are as follows:

(1) Similar with b and c. Approach is to take appropriate measures.

(2) The increase of the system static lift. Approach is to check the liquid level and the system pressure.

(3) Increase the resistance loss. Approach is to check the piping and check valve and other obstacles.

(4) Casing and impeller wear rings wears excessively. Approach is to replace or repair the wear ring and impeller.

(5) Other parts have the leakage. Approach is to check the seal and other parts.

(6) Clogging of the pump impeller, wear, corrosion. Treatment is cleaning, inspection, replacement.

2.The lift is not enough

Causes and treatment methods are as follows:

(1) Similar with b in (1), (2), (3), (4), c in(1) and d in (6). Approach is to take appropriate measures.

(2) The impeller installed backwards (double suction wheel). Approach is to check the impeller.

(3) The liquid density, viscosity inconsistent with the design conditions. Approach is to examine the physical properties of the liquid.

(4) If the flow rate is too large during operation. The method of treatment is to reduce traffic.

3.The power consumption in running 

Causes and treatment methods are as follows:

(1) The impeller and wear rings, impeller and the casing has frictions. Approach is to check and repair.

(2) Similar with e (4) item. The method of treatment is to reduce traffic.

(3) The liquid density increased. Approach is to check the density of the liquid.

(4) If packing is too tight or there is dry friction. Approach is to relax the packing, check the seal tube.

(5) The bearing damage. Approach is to check, repair or replacement of the bearings.

(6) If the speed is too high. Approach is to check the driver and power supply.

(7) The pump spindle is bent. Approach is to correct the pump spindle.

(8) The axial force balancing device failure. Approach is to check the balance of holes, the return pipe is not clogged.

(9) The coupling is adverse or axial gap is too small. Approach is to check the situation and adjustment of the axial clearance.