How to inspect and maintain pumps and fans that have been shut down for 5 years before restarting them
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How should pumps and fans that have been shut down for 5 years be inspected and repaired before being restarted? What are the specific things to pay attention to before putting them into use again? Thank you!
What type of fan is it? Could you provide some information on the equipment?
Inspect the bearings, shaft, impeller, motor, and coupling. Things like bearings probably need to be replaced right away. If the impeller is rusted, it needs to be rebalanced.
Because the oil level in the bearings is usually half of that in the oil sight glass, which means that some of the bearings are exposed to air; as a result of not being used for a long time, they will rust. The shaft may also be bent; all pumps that have not been in use for a long time require major repairs, including disassembly, re-measurement of parameters, checking the straightness of the shaft, replacing bearings, and adjusting the mechanical seal as necessary, along with re-verifying its alignment
It’s necessary to take it apart to check for rust on the components. Then, check whether the rotating parts such as bearings and impellers are stuck. After that, when starting the machine, it’s important to first test the motor to see its direction of rotation; afterwards, run a no-load test to measure the bearing temperature and vibration levels
Perform a thorough disassembly and overhaul: replace aged transmission components and seals; if there are expansion joints at the outlet, it’s advisable to replace them as well. Check for leaks in the inlet and outlet valves, inspect the motor’s insulation, and examine the wiring.
Replace the fan’s lubricating oil, check the fan’s cranking mechanism, and inspect the motor’s insulation; if everything is fine, it can be started for testing.