No. | Problem observed | Possible reason | Solution |
1 | Vibration and noise increased | Blocked or leakage at suction pipe | Check and clean suction pipe |
2 | Vibration and noise increased | Suction height is too big | Reduce pump suction height |
3 | Vibration and noise increased | Bearing damaged | Replace bearing |
4 | Pressure fluctuation | Blocked or leakage at suction pipe | Check and clean suction pipe |
5 | Pressure fluctuation | Pump suction height is too big | Reduce pump suction height |
6 | Capacity decreased | Blocked or leakage at suction pipe | Check and clean suction pipe |
7 | Capacity decreased | Suction height is too big | Reduce pump suction height |
8 | Capacity decreased | Low speed | Increase pump speed |
9 | Capacity decreased | Wear of rotor or liner | Replace the worn parts |
10 | Capacity decreased | Leakage of relief valve | Repair sealing face |
11 | Capacity decreased | Leakage of shaft seal | Replace seal parts |
12 | No fluid pumped | Blocked or leakage at suction pipe | Check and clean suction pipe |
13 | No fluid pumped | Suction height is too big | Reduce pump suction height |
14 | No fluid pumped | Wear of rotor or liner | Replace the worn parts |
15 | No fluid pumped | Wrong shaft rotation direction | Correct rotation direction |
16 | Shaft power increased | High pumped fluid viscosity | Decrease viscosity with heating |
17 | Shaft power increased | Wear of pump parts | Replace worn parts |
18 | Shaft power increased | Not alignment of pump and motor | Check to align |
19 | Shaft power increased | Blocked at discharge pipe | Check to clean discharge pipe |
20 | Overheat of screw pump | Wear of rotor or liner | Replace worn parts |
21 | Overheat of screw pump | Wear of pump internal parts | Replace worn parts |
22 | Overheat of screw pump | Not alignment of pump and motor | Check to align |
23 | Overheat of screw pump | Blocked at discharge pipe | Check to clean discharge pipe |
24 | Overheat of mechanical seal | Blocked of return oil line | Clean the return oil line |
25 | Leakage of mechanical seal | Blocked of return oil line | Clean the return oil line |
26 | Leakage of mechanical seal | Damaged of parts | Replace the damaged part |