Troubleshooting |
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Problems | Causes | Solutions |
1. Water cannot be sucked and both the hands of vacuum gauge and manometer beat violently | 1. The Pouring water is insufficient | 1. Pour water in again |
2. Air leakage from the joints between the inlet and meters | 2. Fix the joints tightly |
2. Water cannot be sucked while high degree vacuum is indicated on the vacuum gauge | 1. The foot valve is lodged or not open | 1. Check or replace the foot valve |
2. Too high suction resistance | 2. Check up or replace the suction pipe |
3. Suction pipe is mounted too high | 3. Reduce the suction lift |
3. No water is delivered in spite of pressure shown on the manometer | 1. Too high outlet resistance | 1. Check or shorten the pipe |
2. Motor is working in a wrong direction | 2. Check the motor |
3. The impeller is clogged | 3. Remove the foreign matter in the impeller |
4. Motor speed is insufficient caused by the low voltage | 4. Regulate the voltage |
4. The pump is working at the capacity lower than the specified value | 1. The pump is clogged | 1. Clean up the pump and relevant pipes |
2. Seal ring has been worn out | 2. Replace the seal ring |
3. Speed is insufficient | 3. Increase speed |
4. The foot valve or suction pipe is lodged | 4. Clean up or replace the foot valve |
5. Too much power is consumed | 1. The packing is too tight and the suffing box is to hot, or mechanical friction caused to the rotor | 1. Loosen the packing gland appropriately. Calibrate the shaft and the rotor |
2. Both the impeller and seal ring are worn out | 2. Replace the impeller and seal ring |
3. The pump is working in large flow | 3. Close the gate valve of outlet a little bit to reduce the flow |
6. The pump vibrates or unexpected noise is heard | 1. Foundation is not firm | 1. Tighten the supporter near the flange |
2. Air leakage in suction pipeline or the submerse depth of inlet is not enough, which results in air pocket into pump | 2. Fix the leakage points or increase the submerged depth of the suction pipe |
3. Cavitation in the impeller | 3. Reduce the mounting height or increase the diameter of inlet or coming pressure, replace the mangled impeller |
4. The pump deviates the operating condition | 4. Adjust to working under the high efficient service condition instead of operating at large flow |
5. The bearing is mangled | 5. Replace the bearing |
7. The bearings are over-heated, the elastic piece of coupling is worn out too fast | 1. The bearing lack lubricant | 1. Lubricate the bearings |
2. The motor shaft is not in alignment to that of the pump. The pump shaft is bent | 2. Align the motor shaft with that of the pump. Calibrate or replace the pump shaft |
8. The elastic plece of coupling is worn out to fast | 1. The motor shaft is not alignmon to that of the pump | 1. Align the motor shaft with that of the pump |