After the vertical reciprocating compressor is started, there is a loud noise inside the bearing housing; after it has been running for one minute, the noise becomes normal. Why is that?
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After the vertical reciprocating compressor was started, there was a loud noise inside the bearing housing; after it ran for one minute, the noise became normal. Why is that? When the compressor was stopped, abnormal noise appeared again. The clearance of the crankshaft bearings was found to be appropriate, as was the clearance of the small-end bearings, and the clearance at the top and bottom dead centers was also proper. I would like some advice on this
In addition to checking the main bearing shells and the small-end bearing shells in such a situation, it is also necessary to verify whether the clearance of the crosshead (sliding sleeve) meets the required standards. Furthermore, when the piston rod cap is loose, noise can also be heard inside the crankcase (through transmission); this is because a loose piston rod cap tends to produce noise when under pressure, and the noise decreases as the pressure increases.
I analyze that it is caused by poor lubrication conditions. Should a vertical compressor be equipped with a hand-cranked oil pump? The oil pressure is not checked 30 seconds before startup. Within a certain period after startup, the oil pressure is not fully established, resulting in relatively high noise due to the force transmission between the various friction pairs. When the machine is shut down, the oil pressure drops as the compressor speed decreases, and the same situation occurs. Also, if the compressor and motor are rigidly connected, it is caused by poor alignment.
Is it the sound of oil splashing? Or the bearing lubrication was poor at first.
Is the noise related to loading or unloading? If so, it could be the sound of the valve or piston rings in their free state.
I agree with what was said on floor 5; it’s probably caused by pressure imbalances when starting up and stopping.
I agree with what was said on floor 5; it’s probably caused by pressure imbalances when starting up and stopping.
It could also be the sound of mild water hammer caused by a leak in the cylinder liner.