Centrifugal pump what are the common faults and troubleshooting? (two)

Symptoms	Cause of the malfunction	Approach
Stuffing box Leakage too much	1 , packing wear 2 , the packing pressure is not tight 3 , packing installation error 4 , pump shaft bending or wear	1 , replace the packing 2 , tighten the packing gland or add filler 3 , re-install packing 4 , repair or replace the pump shaft
Overheating filler	1 , packing pressed too tight 2 , the filler can not enter the cooling water 3 , shaft and sleeve surface is damaged	1 , appropriate to relax the packing 2 , loose packing or infusion tube packing ring hole is blocked 3 , repair the shaft surface or replace the sleeve
Bearing overheating	1 , poor lubrication oil or insufficient oil 2 , the shaft has been bent or bearing ball out of round 3 , the bearing is not installed properly or the gap is not appropriate 4 , pump shaft and motor shaft concentricity does not meet the requirements 5 , the bearing has been worn or loose 6 , balance plate loss of effect	1 , replace qualified new oil, and add enough oil 2 , repair or replacement parts 3 , check and repair 4 , find out again 5 , check or replace the bearing 6 , check the balance is clogged, overhaul balancing disc and balance ring, the two should be parallel to each other and make it perpendicular to the pump shaft; replace the balance ring or balance disc
vibration	1 , the uneven wear of the impeller or part of the runner block, resulting in impeller imbalance 2 , bearing wear 3 , pump shaft bending 4 , the pump seal ring, balance ring and rotor friction part 5 , rotating parts of the loose or broken 6 , Cavitation occurs in the pump 7 , two coupling bad combination 8 , anchor bolts loose	1 , the impeller balance correction or cleaning impeller 2 , repair or replacement of bearings 3 , straighten or replace the pump shaft 4 , eliminate friction while ensuring a smaller seal gap 5 , repair or replacement of wear parts 6 , eliminate the causes of cavitation 7 , readjust the installation 8 , tighten the anchor nut

Symptoms

Cause of the malfunction

Approach

Stuffing box Leakage too much
1 , packing wear
2 , the packing pressure is not tight
3 , packing installation error
4 , pump shaft bending or wear
1 , replace the packing
2 , tighten the packing gland or add filler
3 , re-install packing
4 , repair or replace the pump shaft
Overheating filler
1 , packing pressed too tight
2 , the filler can not enter the cooling water
3 , shaft and sleeve surface is damaged
1 , appropriate to relax the packing
2 , loose packing or infusion tube packing ring hole is blocked
3 , repair the shaft surface or replace the sleeve
Bearing overheating
1 , poor lubrication oil or insufficient oil
2 , the shaft has been bent or bearing ball out of round
3 , the bearing is not installed properly or the gap is not appropriate
4 , pump shaft and motor shaft concentricity does not meet the requirements
5 , the bearing has been worn or loose
6 , balance plate loss of effect
1 , replace qualified new oil, and add enough oil
2 , repair or replacement parts
3 , check and repair
4 , find out again
5 , check or replace the bearing
6 , check the balance is clogged, overhaul balancing disc and balance ring, the two should be parallel to each other and make it perpendicular to the pump shaft; replace the balance ring or balance disc
vibration
1 , the uneven wear of the impeller or part of the runner block, resulting in impeller imbalance
2 , bearing wear
3 , pump shaft bending
4 , the pump seal ring, balance ring and rotor friction part
5 , rotating parts of the loose or broken
6 , Cavitation occurs in the pump
7 , two coupling bad combination
8 , anchor bolts loose
1 , the impeller balance correction or cleaning impeller
2 , repair or replacement of bearings
3 , straighten or replace the pump shaft
4 , eliminate friction while ensuring a smaller seal gap
5 , repair or replacement of wear parts
6 , eliminate the causes of cavitation
7 , readjust the installation
8 , tighten the anchor nut

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