Solutions for high noise and vibration in pump inlet pipelines
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I would like to ask the experts here: Our company has three circulation water pumps arranged in a two-main-one-redundancy configuration. When each pump operates alone, there are no issues with vibration, but there is considerable noise and vibration at the inlet of the pipelines； Especially when two units are operated simultaneously, the vertical vibration at the drive ends fluctuates between 3.0–5.8 mm/s, and neither the noise nor the vibration is eliminated. I would like to ask what causes this and how it should be resolved? Thank you
It needs to be drained slowly to see if support is required
What is the specific water level in the tank, and what is the flow rate of the pump?
Water level: 60% of the tank’s capacity. The pump’s rated flow rate is 1450 m³/h
It is recommended to check whether the connection at the pump outlet pipe is appropriate (water resistance may be present)； Is cavitation caused by an excessively small tank volume? I’m trying to find a specialist in a forum to help you with the diagnosis, and at the same time learn* some things...
Water level height M; the reference plane is the axis plane of the pump
Based on the information you provided, it seems to be an open-loop circulating water system. If there are suspicions regarding issues with suction, the first thing to check is whether the pump meets the installation requirements – specifically, the difference in height between the liquid level in the circulation tank and the centerline of the pump’s suction flange. Additionally, a complicated suction pipeline (with too many fittings such as elbows), an insufficient diameter in the pump’s suction pipe, or a clogged filter at the pump inlet can all lead to high water resistance. Excessive vibration in the pump may also be an issue; if judging by the sound, this could be caused by an excessive discharge volume or flow rate. It’s also necessary to check the pressure at the pump’s outlet as well as the pressure in the circulation water network. Furthermore, is the current consumption of the pump’s motor within normal ranges?
Same question. Is it okay as long as the vibration isn’t strong?