Abnormal noise from the plunger pump
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This post was last edited by gaodi913 on 2015-12-14 at 12:08. Everyone, our facility has two three-cylinder piston pumps. Currently, the operating sounds of these two pumps are quite different; a clear knocking sound can be heard from one of them, while the other one makes very little noise. The outlet pressure of both pumps is normal, and they transport the same type of fluid through the same inlet pipeline. I’m not sure which of these two pumps is problematic!
Run two at the same time, or one in use and one as a backup?
My advice to you is that both pumps are working properly. The one with loud noise is likely experiencing dryness or blockages in the medium being pumped, which causes loud noises from the plunger; as long as it operates stably, no maintenance is required. Still, it is recommended that you strengthen inspections, and make plans to carry out maintenance on pumps that produce loud noises.
Conduct thorough inspections, record pressure, flow rate, and temperature; analyze any changes that occur
Check the clearance of the big and small end bearings of the connecting rod, the connection between the crosshead and the plunger rod, and inspect the inlet and outlet check valves.
Which is your equipment manufacturing company? Check the clearance between the plunger and the crosshead, and inspect the inlet and outlet check valves.
If it runs without problems and there is no change in pressure, you should check the connection between the crosshead and the plunger to see if there is any gap in that connection; such a sound is very rhythmic and regular. Also, check the lubricating oil pressure and the clearances of the big-end bearings and the crankshaft bearings; excessive clearances in these areas can also cause noise to be transmitted.
It should be the sound of a one-way valve; pay close attention. If the sound increases or the flow rate is insufficient, check it promptly.