GDL multi-stage centrifugal pump troubleshooting

So drop phenomenon Possible causes Method of exclusion
No water pump 1, the import and export of valves is not open, out of the pipeline blocked, the impeller flow blockage.
2, the motor is running in the wrong direction, the motor phase loss is very slow.
3, suction tube leakage.
4, the pump is not filled with liquid, the pump cavity with air.
5, import insufficient water supply, suction stroke is too high, the valve leaks.
6, pipe resistance is too large, improper pump selection. 1, check, remove the obstruction.
2, adjust the motor steering, tighten the motor wiring.
3, tighten the sealing surface, remove the air.
4, open the pump cover or open the exhaust valve, drain the air.
5, stop checking, adjust
6, reduce the pipe bend, re-select the pump.
Insufficient pump flow 1, press 1, the reason check
2, pipes, pump runner or impeller blockage, scale deposition, valve opening insufficient.
3, the voltage is low.
4, impeller wear. 1, press 1 to exclude.
2, remove the blockage, readjust the valve opening.
3, the regulator.
4, replace the impeller.
Power is too high 1, more than the rated flow use.
2, suction stroke is too high.
3, pump bearing damage.
1, adjust the flow, off the small outlet valve.
2, lower.
3, replace the bearing.
Noise vibration 1, unstable pipe support.
2, liquid mixed with gas.
3, cavitation.
4, bearing damage.
5, the motor overload operation. 1, a solid pipeline.
2, improve suction pressure, exhaust.
3, reduce the degree of vacuum.
4, replace the bearing.
5, adjust press 5.
Motor is hot 1, the flow is too large, overload operation.
2, partial friction.
3, motor bearing damage.
4, the voltage is insufficient. 1, off the small outlet valve.
2, check and rule out.
3, replace the bearing.
4, regulator.
Water pump leaks 1, mechanical seal damage.
2, the pump has sand holes or cracks.
3, sealing surface is not flat.
4, the installation screw release. 1, replacement.
2, welding repair or replacement.
3, trim.
4, fastening.
Therefore, the drop phenomenon may cause the reasons to exclude the pump does not water 1, import and export valves are not open, out of the pipeline plug, impeller flow blockage.
2, the motor is running in the wrong direction, the motor phase loss is very slow.
3, suction tube leakage.
4, the pump is not filled with liquid, the pump cavity with air.
5, import insufficient water supply, suction stroke is too high, the valve leaks.
6, pipe resistance is too large, improper pump selection. 1, check, remove the obstruction.
2, adjust the motor steering, tighten the motor wiring.
3, tighten the sealing surface, remove the air.
4, open the pump cover or open the exhaust valve, drain the air.
5, stop checking, adjust
6, reduce the pipe bend, re-select the pump. Pump flow less than 1, first press 1, the reason check
2, pipes, pump runner or impeller blockage, scale deposition, valve opening insufficient.
3, the voltage is low.
4, impeller wear. 1, press 1 to exclude.
2, remove the blockage, readjust the valve opening.
3, the regulator.
4, replace the impeller. Power is too large 1, more than the rated flow.
2, suction stroke is too high.
3, pump bearing damage.
1, adjust the flow, off the small outlet valve.
2, lower.
3, replace the bearing. Noise vibration 1, unstable pipe support.
2, liquid mixed with gas.
3, cavitation.
4, bearing damage.
5, the motor overload operation. 1, a solid pipeline.
2, improve suction pressure, exhaust.
3, reduce the degree of vacuum.
4, replace the bearing.
5, adjust press 5. Motor heat 1, the flow is too large, overload operation.
2, partial friction.
3, motor bearing damage.
4, the voltage is insufficient. 1, off the small outlet valve.
2, check and rule out.
3, replace the bearing.
4, regulator. Pump leakage 1, mechanical seal damage.
2, the pump has sand holes or cracks.
3, sealing surface is not flat.
4, the installation screw release. 1, replacement.
2, welding repair or replacement.
3, trim.
4, fastening.
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HEBEI DONGDING CHEMICAL TRADE CO.,LTD , https://www.hebeiopct.com

November 10, 2024

So drop phenomenon	Possible causes	Method of exclusion
No water pump	1, the import and export of valves is not open, out of the pipeline blocked, the impeller flow blockage. 2, the motor is running in the wrong direction, the motor phase loss is very slow. 3, suction tube leakage. 4, the pump is not filled with liquid, the pump cavity with air. 5, import insufficient water supply, suction stroke is too high, the valve leaks. 6, pipe resistance is too large, improper pump selection.	1, check, remove the obstruction. 2, adjust the motor steering, tighten the motor wiring. 3, tighten the sealing surface, remove the air. 4, open the pump cover or open the exhaust valve, drain the air. 5, stop checking, adjust 6, reduce the pipe bend, re-select the pump.
Insufficient pump flow	1, press 1, the reason check 2, pipes, pump runner or impeller blockage, scale deposition, valve opening insufficient. 3, the voltage is low. 4, impeller wear.	1, press 1 to exclude. 2, remove the blockage, readjust the valve opening. 3, the regulator. 4, replace the impeller.
Power is too high	1, more than the rated flow use. 2, suction stroke is too high. 3, pump bearing damage.	1, adjust the flow, off the small outlet valve. 2, lower. 3, replace the bearing.
Noise vibration	1, unstable pipe support. 2, liquid mixed with gas. 3, cavitation. 4, bearing damage. 5, the motor overload operation.	1, a solid pipeline. 2, improve suction pressure, exhaust. 3, reduce the degree of vacuum. 4, replace the bearing. 5, adjust press 5.
Motor is hot	1, the flow is too large, overload operation. 2, partial friction. 3, motor bearing damage. 4, the voltage is insufficient.	1, off the small outlet valve. 2, check and rule out. 3, replace the bearing. 4, regulator.
Water pump leaks	1, mechanical seal damage. 2, the pump has sand holes or cracks. 3, sealing surface is not flat. 4, the installation screw release.	1, replacement. 2, welding repair or replacement. 3, trim. 4, fastening.