Regarding the vibration issue in a pipeline from the first-stage decomposition separator to the second-stage decomposition heater
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This post was last edited by 1025199692 on 2009-6-21 23:22. The pipeline that connects the single-stage decomposer to the two-stage decompression heater experiences significant vibration when operating at full load. What causes this phenomenon, and how can it be resolved? I hope experts can provide guidance. (Complete circulation of aqueous solution)
Based on our company’s experience, pipe vibration is often related to the pipe’s natural frequency; in other words, abnormal vibrations occur when resonance takes place. It is recommended to adjust the pipe’s layout or add damping elements. :D :D
It is caused by obstruction in the flow, which leads to pipeline resonance, and it is related to the natural frequency of the pipeline. It is likely that the pipe size is too small, or there are too many bends during the design and installation process. Solution: Reinforce the pipeline by eliminating bends or thickening it.
Here are a few suggestions: 1. As mentioned above, strengthen the fixation of the pipes to prevent vibration caused by inadequate reinforcement of the pipes. 2. According to the poster’s description, it is likely that the urea plant is operating under overload conditions; it is recommended to replace the pipeline from the first-stage decomposition separator to the second-stage decomposition unit with one of larger diameter. 3. May I ask the original poster whether the liquid level display of the One-Point Tower is accurate? If it is not accurate, there may be a leak of air. If there is gas leakage, it can also cause vibration in the liquid outlet pipeline of the primary column.
Strengthen the fixation of pipes to prevent vibrations caused by inadequate reinforcement of the pipes
Check whether the reinforcement points are appropriate; add more reinforcement points.
Looking forward to experts recommending a simple and effective method for strengthening pipes
Pipelines are secured, usually with clamps; this helps to address the sources of vibration and prevents gas from entering the liquid phase.
First, simply reinforce the pipes and re-evaluate the production load. In my opinion, the issue is likely due to the excessive capacity of the pipes. In typical urea production processes, the decomposition cycle system, especially the first and second decomposition towers, does not have liquid level control during normal operation. If the pipe diameter is too large, air leakage is more likely to occur, and the flow of mixtures through the pipes can cause vibrations.
1. Strengthen fixation 2. Control load