Abnormal noise from the compressor
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Our facility has a compressor used to fill natural gas cylinders; when the pressure reaches around 18 MPA, abnormal noises start to appear. It’s difficult to determine exactly what the problem is – the noise comes from the area behind the motor. Each time the pressure is reduced to level 4, the noise disappears. The compressor is of the 4-stage compression type, with a V-shaped design: stages 1 and 4 are on one side, while stages 2 and 3 are on the other. Has anyone encountered this issue? What could be the cause, and how can it be fixed? The noise is a sharp sound resulting from metal rubbing against each other; I suspect there might be a problem with the motor bearings, but the current levels don’t seem to indicate any major issues
The cooling fan of the motor? You mean the fan on the back of the motor? This is quite normal; it shouldn’t be a problem on its part. Abnormal noises only occur when the pressure reaches around 18 MPa. There were no issues before, so I think it’s not this component that’s the problem
Has something foreign gotten into the motor cooling fan housing, such as screws or nuts?
I don’t think so; it’s just an ordinary V-type compressor, with each stage of exhaust cooling being achieved through air cooling, and there is a dedicated air cooler
There shouldn’t be any such issue. If there were, there would be continuous noise; it’s not possible for noise to start appearing only at 18 MPa. Logically, there should be no problem
There should be no problem with it; it hasn’t been disassembled. However, the coupling was replaced some time ago – it’s made of rubber
What kind of sound? Continuous or intermittent? Sharp or muffled? If it only occurs when the pressure rises to a certain level, it may be because there are hidden problems inside the motor as its load increases. Insufficient information makes it impossible to determine; it’s recommended to take it apart and check.
Check the design load of the motor unit; it is suspected that the torque is high, resulting in excessive stress on the motor’s rear bearing.