The centrifugal pump is not working properly
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After prolonged use, the performance of centrifugal pumps deteriorates. We have a canned motor pump that has been in use for over 10 years. In the past two years, we’ve noticed that it either lacks flow when high head is required, or lacks high head when flow is needed. However, after disassembling the pump for inspection, no abnormalities were found. It is determined that slight wear of the impeller is causing a decrease in head. Welcome to experts who can offer guidance?
(1) Check whether the power supply is connected properly； (2) Check whether the switch is properly connected ； (3) Check whether lubricating oil has flowed in ； (4) Check the air supply from the fan ； (5) Inspect the worn components inside the motor (corrugated plates, worms, etc.) ； (6) Check whether the expansion storage component of the centrifugal pump is overheated, and verify that it is within the normal range ； (7) Check whether the water level feedback device is functioning properly to ensure that the level and flow rate remain within normal ranges ； (8) Check whether the mechanical seal or metal seal of the centrifugal pump is functioning properly ； (9) Check whether the building components, mechanical parts, driving components, pipeline accessories, exhaust valves, and other components of the centrifugal pump are worn out, aged, or deformed ； (10) Check whether the fastening screws of the drive coupling, the coupling teeth, the reducer, the transmission mechanism, etc. are loose ； (11) Check whether the temperature of the motor (the centrifugal pump unit) is normal, to ensure that the temperature rise does not exceed the normal level ； (12) Check whether parameters such as operating torque, pressure, and flow rate of the centrifugal pump meet the requirements of the design specifications.
This slight wear needs to be addressed more strictly, especially as it has an impact on centrifugal pumps. If possible, it is recommended to replace the impeller and try again. The lifespan of a pump depends mainly on whether its main components can remain in working condition; usually, replacing the spare parts allows it to continue to be used. For reference.
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The gap between the impeller’s mouth ring and the pump casing can typically be as low as 0.5 mm; if this gap increases, both the flow rate and head will decrease.
Visual inspection alone is not sufficient; relevant measurements must be taken to check whether there are any changes in dimensions or gaps, so as to determine where the problem lies.