Volute noise in single-stage centrifugal pumps
Thread Content
Model: HZ200-150-315, Flow rate: 400, Head: 32, Power: 75kw, Rotation speed: 1450, Sichuan Zigong Industrial Pump Co., Ltd. Medium: concentrated brine at around 100°C. The pump selected is too large; the outlet valve is opened to about one-third of its full capacity, while the actual flow rate required is around 210 m3. During operation on site, it was found that there was a loud noise coming from the volute (a cracking sound), similar to the sound of cavitation. The impeller and shaft were inspected and no damage was found; opening the outlet valve further can reduce this noise until it disappears. Question: Where does this sound come from? Will there be any future problems? Is there a good solution? Thank you all.
Venting was done before starting the pump, and samples were taken during operation, so this possibility can be ruled out
Generally, in the case of cavitation, increasing the valve opening does not make the noise disappear. If the exhaust is not complete, the valve opens wider to allow air to escape, reducing the noise. There are dead corners
It’s still cavitation; it is recommended to increase the size of the return valve and the outlet valve, which will make operation more stable.
Is this position the peak of the traffic curve? Check the accurate performance curve
What is the outlet pressure when the noise level is high?