High noise from the balance line at the inlet and outlet of the shielded pump during operation
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After the shielded pump is started, there is a loud noise generated by the blockage in the inlet and outlet balance lines, and this noise does not improve significantly after venting. What causes this?
What type of shielded pump is it? The original poster didn’t say~~~ There are several types of pumps that come with return pipes (it’s a return pipe, not a balance pipe! )~~~For now, consider it as a basic type with external circulation~~~ “The sound of flow interruption is very loud”~~~ This seems to refer to the sound of air flow; therefore, the following possibilities exist: 1) There are foreign objects blocking the return pipe, but it isn’t completely blocked ； 2) Abnormal wear of bearings generates high heat~~ ； 3) The medium temperature is too high; the temperature in the reflux section has not dropped~~
If the pump is functioning properly, consider whether it could be the high head pressure or flow restriction at the outlet – such as an orifice plate or valve – that causes normal scouring noises; if that’s the case, it’s difficult to deal with
I originally included a picture when posting, but it didn’t appear. It is the inlet/outlet balance line, not the minimum return line at the pump tail end
It’s a structural issue; it seems that the specific speed of your pump is relatively low. The manufacturer likely used these pipes to balance the axial forces. You should ask the manufacturer whether this noise is normal. Using thicker pipes would help, and as long as the noise doesn’t affect performance and remains within acceptable levels, there shouldn’t be any problem!
It does balance the axial force, but I’ve never heard this kind of noise before
Your question is too technical! 1. Clean the pipeline. 2. Check whether the axial force is deviated. 3. Invite a technician from Nichiyu