Analysis of causes of pump pipeline vibration
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When the pump is running at a small flow rate (near the minimum continuous stable flow rate), the inlet pipeline has some vibration, but it meets the vibration standard. As the flow rate is gradually increased, the vibration increases and then increases the flow rate. The vibration continues to increase, and there is a roaring sound. When the flow rate is increased, the vibration is normal (within the standard requirements). In the above cases, the vibration is on the pump inlet pipeline, and the vibration on the outlet pipeline has always been normal. The vibration of the pump has always been normal. The pumping medium is potassium carbonate.
1. The pump has a minimum flow limit. If it works below the minimum flow line, vibration will inevitably occur. 2. Not only is the pipeline prone to problems, the pump is very easy to damage, and the working efficiency is also very low in the small flow area. 3. Work should be done away from the minimum flow line.
I personally think: 1. There is a problem with the pipeline support. As the flow increases, the vibration increases. After passing this area, the vibration does not change with the flow, which means there is a resonance zone. The solution is to increase or change the position of supports in areas with large pipeline vibrations to eliminate resonant frequencies.
Thanks for the analysis! But if it operates below the minimum continuous stable flow point, it stands to reason that the pump should also be over-vibrated.
Thank you very much! This possibility is relatively high. In addition, is it possible that the medium produces CO2 and vibrates?
Firstly, cavitation may occur at the minimum continuous stable flow rate, and again there is the possibility of pipeline resonance.
It's not resonance. It's upstairs. The actual situation is that only the inlet pipeline is vibrating, and the pump and outlet pipeline are not vibrating.
Are there curved pipes in the inlet pipeline? If there is a curved pipe, the momentum of the fluid will change when passing through, which will cause the inlet pipeline to vibrate. The frequency of this vibration is equal to or close to the natural vibration frequency of the pipeline, causing resonance, which is manifested as a relatively severe vibration that is beyond the normal range.
First, the cavitation of the pump itself causes pump vibration and affects pipeline vibration. Second, the transport medium decomposes gas, resulting in a steam hammer phenomenon. Resonance occurs when the vibration frequency of the pump is consistent with the vibration frequency of the pipeline.