1. Bearing of fire pump overheating
1. Cause analysis: fire pump and motor shaft misalignment
Solution: alignment, the alignment fire pump and motor shaft.
2. No or insufficient lubricating oil to lubricate the required standard.
3. Cause analysis: Bearing damage

Solution: get a new fire pump bearings.
2.Head of fire pump is not enough 1. Cause analysis: speed insufficient
Solution: check the current recovery speed.
2. Cause analysis: Impeller severe corrosion
Solution: change a new impeller
3. Cause analysis: he semi-open impeller and pump cover fire gap is too large
Solution: reduce the gap.
4. Cause analysis: the fire pump performance to reach the design requirements
Solution: change in line with the design requirements of the fire pump.

3.Seriously leakage of packing gland of fire pump
1. Cause analysis: poor quality packing seal is not good
Solution: replacement of asbestos packing to meet the requirements.
2. Cause analysis: bushings wear too much
Solution: replace the sleeve.
3. Cause analysis: packing sizes or badly worn
Solution: replace uniform type filler.
4. Cause analysis: packing pressure is too loose
Solution: tighten the packing gland to an appropriate level.
5. Cause analysis: the filler means bad
Solution: adjusting packing take the mouth, so that it does not stagger certain angle in one direction.

4.Fire pump flow is not enough
1. Cause analysis: the seal ring severe wear or corrosion
Solution: get a new seal ring.
2. Cause analysis: the semi-open impeller and pump cover fire gap is too large
Solution: reduce the gap.
3. Cause analysis: the suction line too small or clogged
Solution: in other suitable pipeline to clear debris.
4. Cause analysis: impeller wears serious or severe corrosion
Solution: change a new impeller.
5. Cause analysis: the suction tube can be immersed deep enough; there is pump air into the fire
Solution: increase suction pipe immersion depth, reinstall fire pump stationary ring.