I have compiled some common accidents of centrifugal pumps and their solutions.
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I. Insufficient or no pumping capacity(1) Gas present in the pump and tank
(2) The pump is not filled with liquid when started
(3) Too small a suction head difference
(4) Clogged suction pipe or inlet line
(5) Low temperature (for heavy oils)
(6) Debris inside the impeller
(7) Worn mouth ring, excessive clearance in the casing, or damaged impeller
(8) Impeller installed in the wrong direction or pump running in reverse
(9) Severe vaporization of the oil being pumped
Remedies:
(1) Open the vent valve to release gas
(2) Refill the pump with liquid
(3) Increase the height of the suction tank
(4) Clear the suction pipe and clean the inlet filter
(5) Heat the oil
(6) Remove debris from inside the impeller
(7) Replace components and adjust the clearances
(8) Adjust the direction of the impeller and the power connections
(9) Cool the oil and inlet lines
II. Insufficient output pressure
(1) Incorrect rotation direction
(2) Worn mouth ring, excessive clearances in various parts of the casing
(3) Damaged impeller
(4) High viscosity of the liquid
(5) Large amount of gas in the liquid or pump not fully filled
Remedies:
(1) Adjust the rotation direction
(2) Adjust the clearances
(3) Replace the impeller
(4) Raise the temperature of the oil
(5) Open the vent valve to release gas
III. Oil leakage from the pump
(1) Caused by vacuum conditions
(2) The cover is not tightened properly
(3) Failed seals
Remedies:
(1) Eliminate the vacuum conditions
(2) Tighten the cover properly
(3) Stop the pump for maintenance
IV. Large fluctuations in motor current
(1) Unstable current and motor operation
(2) Worn motor bearings
(3) Unstable flow rate
(4) Faulty ammeter
(5) Affected by large electrical loads during startup
(6) Vacuum conditions in the pump
(7) Deformed or bent shaft
Remedies:
(1) Contact an electrician for repairs
(2) Contact an electrician for repairs
(3) Adjust the flow rate
(4) Repair or replace the ammeter
(5) Identify the cause
(6) Eliminate vacuum conditions
(7) Repair or replace components
V. Noises from the pump
(1) Lack of oil or insufficient oil in the bearing housing
(2) Damaged, loose, or clogged components
(3) Damaged impeller
Remedies:
(1) Add oil
(2) Replace damaged components
(3) Perform maintenance
VI. Pump cannot be rotated
(1) Oil has solidified
(2) Pump has not been rotated for a long time
(3) Damaged components
Why hide it? There’s no need to hide it; the content is as follows:
I. Insufficient or no pumping capacity
(1) Gas present in the pump and tank
(2) The pump is not filled with liquid when started
(3) Too small a suction head difference
(4) Clogged suction pipe or inlet line
(5) Low temperature (for heavy oils)
(6) Debris inside the impeller
(7) Worn sealing ring, excessive clearance in the casing, or damaged impeller
(8) Impeller installed in the wrong direction or pump running in reverse
(9) Severe vaporization of the liquid being pumped
Remedies:
(1) Open the vent valve to release gas
(2) Refill the pump with liquid
(3) Increase the height of the suction tank
(4) Clear the suction pipe and clean the inlet filter
(5) Heat the oil
(6) Remove debris from inside the impeller
(7) Replace parts and adjust the clearances
(8) Adjust the direction of the impeller and the power connection
(9) Cool the oil and inlet lines
II. Insufficient output pressure
(1) Incorrect rotation direction
(2) Worn sealing ring, excessive clearances in various parts of the casing
(3) Damaged impeller
(4) High viscosity of the liquid
(5) Large amount of gas in the liquid or pump not fully filled
Remedies:
(1) Adjust the rotation direction
(2) Adjust the clearances
(3) Replace the impeller
(4) Raise the temperature of the oil
(5) Open the vent valve to release gas
III. Oil leakage from the pump
(1) Caused by vacuum conditions
(2) The cover is not tightened properly
(3) Failed seals
Remedies:
(1) Eliminate the vacuum condition
(2) Tighten the cover properly
(3) Stop the pump for maintenance
IV. Large fluctuations in motor current
(1) Unstable current and motor operation
(2) Worn motor bearings
(3) Unstable flow rate
(4) Faulty ammeter
(5) Affected by large electrical loads during startup
(6) Vacuum conditions in the pump
(7) Deformed or bent shaft
Remedies:
(1) Contact an electrician for repairs
(2) Contact an electrician for repairs
(3) Adjust the flow rate
(4) Repair or replace the ammeter
(5) Identify the cause
(6) Eliminate vacuum conditions
(7) Repair or replace components
V. Noises from the pump
(1) Lack of oil or insufficient oil in the bearing box
(2) Damaged, loose, or clogged components
(3) Damaged impeller
Remedies:
(1) Add oil
(2) Replace damaged components
(3) Perform maintenance
VI. Pump cannot be rotated
(1) Oil has solidified
(2) Pump has not been rotated for a long time
(3) Damaged components
I. Insufficient or no pumping capacity
(1) Gas present in the pump and tank
(2) The pump is not filled with liquid when started
(3) Too small a suction head difference
(4) Clogged suction pipe or inlet line
(5) Low temperature (for heavy oils)
(6) Debris inside the impeller
(7) Worn sealing ring, excessive clearance in the casing, or damaged impeller
(8) Impeller installed in the wrong direction or pump running in reverse
(9) Severe vaporization of the liquid being pumped
Remedies:
(1) Open the vent valve to release gas
(2) Refill the pump with liquid
(3) Increase the height of the suction tank
(4) Clear the suction pipe and clean the inlet filter
(5) Heat the oil
(6) Remove debris from inside the impeller
(7) Replace parts and adjust the clearances
(8) Adjust the direction of the impeller and the power connection
(9) Cool the oil and inlet lines
II. Insufficient output pressure
(1) Incorrect rotation direction
(2) Worn sealing ring, excessive clearances in various parts of the casing
(3) Damaged impeller
(4) High viscosity of the liquid
(5) Large amount of gas in the liquid or pump not fully filled
Remedies:
(1) Adjust the rotation direction
(2) Adjust the clearances
(3) Replace the impeller
(4) Raise the temperature of the oil
(5) Open the vent valve to release gas
III. Oil leakage from the pump
(1) Caused by vacuum conditions
(2) The cover is not tightened properly
(3) Failed seals
Remedies:
(1) Eliminate the vacuum condition
(2) Tighten the cover properly
(3) Stop the pump for maintenance
IV. Large fluctuations in motor current
(1) Unstable current and motor operation
(2) Worn motor bearings
(3) Unstable flow rate
(4) Faulty ammeter
(5) Affected by large electrical loads during startup
(6) Vacuum conditions in the pump
(7) Deformed or bent shaft
Remedies:
(1) Contact an electrician for repairs
(2) Contact an electrician for repairs
(3) Adjust the flow rate
(4) Repair or replace the ammeter
(5) Identify the cause
(6) Eliminate vacuum conditions
(7) Repair or replace components
V. Noises from the pump
(1) Lack of oil or insufficient oil in the bearing box
(2) Damaged, loose, or clogged components
(3) Damaged impeller
Remedies:
(1) Add oil
(2) Replace damaged components
(3) Perform maintenance
VI. Pump cannot be rotated
(1) Oil has solidified
(2) Pump has not been rotated for a long time
(3) Damaged components