Common problems in the pump troubleshooting

August 04, 2021

malfunction
the reason
Elimination method
1, the pump is not absorbent, pressure gauge and vacuum gauge pointer violently beating
1, not enough water;
2, pipe or instrument leaks.
1, and then to the pump water;
2, tighten the blockage leak.
2, the pump is not absorbent, vacuum gauge shows a high degree of vacuum.
1, the end of the valve did not open or blocked;
2, suction pipe resistance is too large;
3, absorbent height is too high.
1, correction or column exchange valve;
2, cleaning or replacement of suction pipe;
3, reduce the water absorption height.
3, the pump does not water, pressure gauge shows pressure.
1, the outlet pipe resistance is too large;
2, the direction of rotation is wrong;
3, the impeller is blocked
4, speed is not enough.
1, check or shorten the outlet pipe;
2, to correct the direction of motor rotation;
3, cleaning impeller;
4, increase speed.
4, insufficient flow or head is too low.
1, impeller or inlet and outlet pipes blocked;
2, Double suction seal ring wear too much or impeller damage;
3, speed lower than the required value;
1, cleaning impeller or pipe;
2, replace the damaged parts;
3, adjusted to the rated speed;
5, the pump consumes too much power.
1, packing pressed too tight;
2, impeller and double suction seal ring friction;
3, traffic is too large
1, Loose packing gland
2, check the reason, eliminate mechanical friction;
3, adjust the outlet valve, so that it operates within the prescribed range;
6, pump internal abnormal sound, the pump is not on the water.
1, suction pipe resistance is too high; or high water absorption;
2, suction at the air inhalation;
3, the liquid temperature is too high;
4, the flow is too large and cavitation occurs.
1, clear the inlet pipe and bottom valve; reduce the height of water absorption;
2, check the end of the valve; reduce the height of water absorption, block the leak;
3, adjust the liquid temperature;
4, adjust the outlet valve, so that the provisions of the Fan turn in operation.
7, the pump is not normal vibration.
1, pump cavitation;
2, impeller imbalance;
3, pump shaft and motor shaft is not the same;
4, to plug the bolt loose.
1, adjust the outlet valve, so that it operates within the prescribed range;
2, impeller correction static balance;
3, correct the coaxiality of pump shaft and motor shaft;
4, tighten the anchor bolts.
8, bearing overheating
1, There is no oil in the bearing
2, the pump shaft and the motor shaft are not in the same center line;
1, check and clean the bearing body, add lubricants;
2, to adjust the coaxiality of the two axes in the same center line;
malfunction
the reason
Elimination method
1, the pump is not absorbent, pressure gauge and vacuum gauge pointer violently beating
1, not enough water;
2, pipe or instrument leaks.
1, and then to the pump water;
2, tighten the blockage leak.
2, the pump is not absorbent, vacuum gauge shows a high degree of vacuum.
1, the end of the valve did not open or blocked;
2, suction pipe resistance is too large;
3, absorbent height is too high.
1, correction or column exchange valve;
2, cleaning or replacement of suction pipe;
3, reduce the water absorption height.
3, the pump does not water, pressure gauge shows pressure.
1, the outlet pipe resistance is too large;
2, the direction of rotation is wrong;
3, the impeller is blocked
4, speed is not enough.
1, check or shorten the outlet pipe;
2, to correct the direction of motor rotation;
3, cleaning impeller;
4, increase speed.
4, insufficient flow or head is too low.
1, impeller or inlet and outlet pipes blocked;
2, Double suction seal ring wear too much or impeller damage;
3, speed lower than the required value;
1, cleaning impeller or pipe;
2, replace the damaged parts;
3, adjusted to the rated speed;
5, the pump consumes too much power.
1, packing pressed too tight;
2, impeller and double suction seal ring friction;
3, traffic is too large
1, Loose packing gland
2, check the reason, eliminate mechanical friction;
3, adjust the outlet valve, so that it operates within the prescribed range;
6, pump internal abnormal sound, the pump is not on the water.
1, suction pipe resistance is too high; or high water absorption;
2, suction at the air inhalation;
3, the liquid temperature is too high;
4, the flow is too large and cavitation occurs.
1, clear the inlet pipe and bottom valve; reduce the height of water absorption;
2, check the end of the valve; reduce the height of water absorption, block the leak;
3, adjust the liquid temperature;
4, adjust the outlet valve, so that the provisions of the Fan turn in operation.
7, the pump is not normal vibration.
1, pump cavitation;
2, impeller imbalance;
3, pump shaft and motor shaft is not the same;
4, to plug the bolt loose.
1, adjust the outlet valve, so that it operates within the prescribed range;
2, impeller correction static balance;
3, correct the coaxiality of pump shaft and motor shaft;
4, tighten the anchor bolts.
8, bearing overheating
1, There is no oil in the bearing
2, the pump shaft and the motor shaft are not in the same center line;
1, check and clean the bearing body, add lubricants;
2, to adjust the coaxiality of the two axes in the same center line;

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malfunction	the reason	Elimination method
1, the pump is not absorbent, pressure gauge and vacuum gauge pointer violently beating	1, not enough water; 2, pipe or instrument leaks.	1, and then to the pump water; 2, tighten the blockage leak.
2, the pump is not absorbent, vacuum gauge shows a high degree of vacuum.	1, the end of the valve did not open or blocked; 2, suction pipe resistance is too large; 3, absorbent height is too high.	1, correction or column exchange valve; 2, cleaning or replacement of suction pipe; 3, reduce the water absorption height.
3, the pump does not water, pressure gauge shows pressure.	1, the outlet pipe resistance is too large; 2, the direction of rotation is wrong; 3, the impeller is blocked 4, speed is not enough.	1, check or shorten the outlet pipe; 2, to correct the direction of motor rotation; 3, cleaning impeller; 4, increase speed.
4, insufficient flow or head is too low.	1, impeller or inlet and outlet pipes blocked; 2, Double suction seal ring wear too much or impeller damage; 3, speed lower than the required value;	1, cleaning impeller or pipe; 2, replace the damaged parts; 3, adjusted to the rated speed;
5, the pump consumes too much power.	1, packing pressed too tight; 2, impeller and double suction seal ring friction; 3, traffic is too large	1, Loose packing gland 2, check the reason, eliminate mechanical friction; 3, adjust the outlet valve, so that it operates within the prescribed range;
6, pump internal abnormal sound, the pump is not on the water.	1, suction pipe resistance is too high; or high water absorption; 2, suction at the air inhalation; 3, the liquid temperature is too high; 4, the flow is too large and cavitation occurs.	1, clear the inlet pipe and bottom valve; reduce the height of water absorption; 2, check the end of the valve; reduce the height of water absorption, block the leak; 3, adjust the liquid temperature; 4, adjust the outlet valve, so that the provisions of the Fan turn in operation.
7, the pump is not normal vibration.	1, pump cavitation; 2, impeller imbalance; 3, pump shaft and motor shaft is not the same; 4, to plug the bolt loose.	1, adjust the outlet valve, so that it operates within the prescribed range; 2, impeller correction static balance; 3, correct the coaxiality of pump shaft and motor shaft; 4, tighten the anchor bolts.
8, bearing overheating	1, There is no oil in the bearing 2, the pump shaft and the motor shaft are not in the same center line;	1, check and clean the bearing body, add lubricants; 2, to adjust the coaxiality of the two axes in the same center line;