Centrifugal pumps are one of the most important pump set. Previous post ‘Troubleshooting in Centrifugal Pump‘ focuses on water discharge or water delivery problem of a centrifugal pump. In this post ‘Centrifugal Pump Troubleshooting 02‘, we will know about the problem related with the different parts of a centrifugal pump and its remedy or troubleshooting.
(A). List of Problems
- Pump takes too much power
- Stuffing box leaks excessively
- Noisy pump
- Overheating of pump
(B). Troubleshooting of centrifugal pump
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B1: Pump takes too much power
| S. N. | Causes | Explanation | Trouble Shooting |
|---|---|---|---|
| 1. | Speed | Speed is too much | Reduce the speed. |
| 2. | Height of head | When pump head is high | Check it during the time of purchase. |
| 3. | Alignment | If there is a parallel misalignment | Chek the alignment. |
| 4. | Alignment | If there is a angular misalignment | Check the alignment. |
| 5. | Stuffing box | If stuffing box is too tight | Loosen the gland packing. |
| 6. | Packing | If there is improper packing | Check the packing. |
| 7. | Wearing ring | A worn wearing ring | Replace it. |
B2: Stuffing box leaks excessively
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| S. N. | Causes | Explanation | Trouble Shooting |
|---|---|---|---|
| 1. | Worn packing | 1. Worn packing. 2. Lack of lubrication. | 1. Replace packing. 2. Do proper lubrication. |
| 2. | Packing | Packing is not correctly inserted | Remove packings and inset correctly in the stuffing box. |
| 3. | Shaft sleeves | Worn shaft sleeves | Replace |
B3: Noisy pump
| S. N. | Causes | Explation | Trouble Shooting |
|---|---|---|---|
| 1. | Suction pipe | Suction pump not completely filled with water | Do proper priming. |
| 2. | Height of suction lift | Suction lift is too high | Lower it nearer to water source. |
| 3. | Foot valve size | When foot valve is too small | Replace it. |
| 4. | Shaft | When shaft is bent | Repaie or replace it. |
| 5. | Rotating parts | when it is not straight | Straigt it. |
| 6. | Bearing | similar to earlier | Replace it. |
| 7. | Misalignment | Misalignment of pump and driving unit | Align it correctly. |
| 8. | Foundation | When foundation is not rigid | Tight it using bolts. |
B2: Overheating of pump
| S. N. | Causes | Explation | Trouble Shooting |
|---|---|---|---|
| 1. | Priming | When there is not proper priming | Do it properly. |
| 2. | Bearing | Same as previous | Replace it. |
| 3. | Rotating shaft | Lack of lubrication | Do proper lubrication. |
| 4. | Packing glands | When it is too tight | Loosen it. |