Causes and Troubleshooting of Common Faults of Double Suction Pumps

Common faults (1): The pump does not absorb water, and the pointers on the pressure gauge and vacuum gauge jump violently.

Causes of failure: 1, pump water injection is not enough; 2, pipeline or instrument leakage.

Troubleshooting methods: 1, continue to pump water injection. 2. Tighten the plugged air leaks.

Common fault (b): The pump does not absorb water and the vacuum gauge shows a high vacuum.

Failure causes: 1, bottom valve did not open or blocked; 2, suction pipe resistance is too large; 3 water absorption height is too high.

Troubleshooting method; 1. Correct or replace the bottom valve; 2. Clean or replace the suction pipe; 3. Reduce the water absorption height;

Common fault (3): The pump does not discharge water, and the pressure gauge shows pressure.

Causes of failure: 1, the resistance of the outlet pipe is too large; 2, the direction of rotation is wrong; 3, the night block; 4, the speed is not enough.

Troubleshooting methods: 1, reduce or shorten the outlet pipe; 2, to correct the direction of rotation of the motor; 3, cleaning the impeller; 4, increase the speed.

Common faults (4): Insufficient flow or head is too low.

Causes of failure: 1, impeller or inlet and outlet pipeline obstruction; 2, double suction seal ring wear too much, or impeller damage, 3, speed is lower than the specified value.

Troubleshooting methods: 1 cleaning impeller or pipeline; 2, replace the damaged parts; 3 adjust to the rated speed.

Common fault (5): The pump consumes too much power.

Cause of failure: 1 too tight packing pressure; 2, impeller and double suction seal ring friction; 3, flow is too large.

Troubleshooting methods: 1, loosen the packing gland; 2, check the reasons to eliminate mechanical friction; 3, reduce the flow.

Common fault (6): The internal sound field of the pump, the pump is not water.

Failure causes: 1 suction pipe resistance is too large; 2, water absorption height is too high 3, suction out of air inhalation; 4, the suction liquid temperature is too high; 5, cavitation phenomenon.

Troubleshooting methods: clean the suction line and the bottom valve; 2, reduce the water absorption height; 3, check the bottom valve, reduce the water absorption height, block the air leakage; 4, reduce the liquid temperature; 5, adjust the water gate valve, make it in the specified performance Range operation.

Common fault (7): The pump is not normally vibrating.

Causes of failure: 1, pump cavitation occurs; 2, the impeller is unbalanced; 3, pump shaft and motor shaft misalignment; 4, submitted screws loose.

Troubleshooting methods: 1, adjust the water gate valve, so that it operates within the specified performance range; 2, impeller teaching static balance; 3, correct the pump shaft and motor shaft concentricity; 4, quiet foot screws.

Common faults (eight); bearings overheat.

Causes of failure: 1. There is no oil in the bearing and the pump shaft does not agree with the centerline.

Troubleshooting methods: 1, plus lubrication; 2 correct two weeks of concentricity and in the same center line, build a factory and clean the bearing body.