The inlet pipe of the water pump vibrates severely; seeking help
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Our company has 2 KDOW350-520IB type water pumps, one in use and one as a backup. When the pumps are operating, the noise and vibration levels of the pump bodies are normal, but the vibration in the inlet pipes is very high. We seek the help of experts to analyze this issue and find a solution! !
The inlet pipe is vibrating – why not add a pipe support?
Could you please specify what the vibration value is? Radial axial? Is there anything abnormal with the sound? What is the path of the tubes?
Select a few points along the inlet pipe and measure the vibration values in the horizontal and vertical directions. See where the vibration is greatest. Then draw a schematic diagram or take a photo, indicating the horizontal and vertical vibration values at various locations, as well as the positions of the supports before and after the point of maximum vibration in the inlet pipe. Everyone might be able to provide some guidance for you: 1. If the point with the highest vibration amplitude is not far from the existing support, it may be necessary to conduct additional tests on the vibration behavior of that support, to determine whether increasing its stiffness will resolve the issue ； 2. If the peak amplitude is located at one of the current two supports, or between the nearest support and the pump inlet flange, then adding another fixed support will suffice. This matter shouldn’t be very complicated; the vibration frequency is generally the rotational frequency multiplied by the number of impellers at the pump inlet, so whether or not the vibration frequency is measured doesn’t make much of a difference.
It’s difficult to make a judgment with too little information; it is recommended to check whether the pipe diameter is not large enough, whether the spacing between supports is too large, and whether there are any supports that are not providing adequate support
Theory isn’t as good as them; I only talk about practical things. . . We have encountered this situation during maintenance work as well, but the information you provide is too limited, so it’s impossible to fully understand the situation. Is the import shaking a lot? Where is the source of the shaking? Sinking of the base surface? Piping stress? Clogged pipeline? Clogged filter? If you have the time to do it, remove a short-circuit or valve and open the one before it to check whether the flow is normal; if it is, proceed to open the subsequent valves as well. By checking each section in this way, you can determine whether there is a blockage in the pipeline. If you don’t have the time for this, and want to stop the vibration quickly: add pipeline support and use U-clips for securing it ； 2. Replace the metal hose. Based on personal experience, 90% of the cases are caused by stress resulting from pipeline settlement, which leads to significant vibration at the inlet; P