Common problems in the pump troubleshooting

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;