There is abnormal noise in the outlet pipeline of the desalination water pump; please advise
Thread Content
Two new water pumps are connected in parallel; the outlet pipes are at a height of about 5 meters and are connected to a horizontal main pipe. One pump is connected via an elbow and is designated as Pump No. 1, while the other is connected via a tee and is designated as Pump No. 2. Pump No. 1 operates normally when running independently, and there are no abnormal noises in the pipes. Pump No. 2 also functions properly when operated alone, but a loud noise similar to that of metal hitting can be heard continuously in the outlet pipe; the abnormal noise disappears when both pumps are run simultaneously. That is, as soon as Pump No. 1 was started and the outlet valve was slightly opened, the metal striking sound disappeared. I’ve checked for air leakage, the outlet check valve, as well as the outlet vertical pipe; no foreign objects were found, and the source of the abnormal noise cannot be identified. Please advise, experts
How are the outlet pipes fixed? Check the pipe supports.
The pipeline support is fine, right? There isn’t much vibration in the pipelines. Pump No. 1 works properly when operating alone, and it also functions well when both pumps are used together. It’s just that Pump No. 2 makes unusual noises when in operation
Weren’t there sounds of metal striking coming from the outlet pipes? With two pumps connected together, the only difference is that one uses an elbow while the other uses a tee; it might be better if both used elbows and were connected to a tee. The impact of the fluid may cause relative movement between the pipeline and the support.
I would like to ask the moderator: excluding the possibility of pipe support issues, can fluid impact produce a sound similar to that of metal hitting against each other? What else could make such a sound? Please give your advice
There is no sharp knocking sound when fluid flows in a pipe. When cavitation occurs in a pump, there is a popping sound inside the pump casing, but it is not a clear metallic knocking sound.
Is there any issue with opening and closing valves too quickly in your operations? It could be water hammer phenomenon
“Pump No. 2 operates independently and is functioning normally, but the outlet pipeline continuously emits a loud sound similar to that of metal hitting each other~~~ Is the source of this metallic knocking sound located at the outlet check valve or the main outlet valve of Pump No. 1?
It might be the sound coming from the check valve disc
The valve doesn’t open quickly, and the check valve has been checked and is fine. Thank you all; feel free to share your opinions
Are there any other phenomena accompanying the sound? Such as fluctuations in pressure flow, etc.