Seeking help with SW ethylene-related issues
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As shown in the figure, this is a screenshot of the suction tank of the ethylene refrigeration compressor in an SW ethylene plant, and there are several issues: 1. Why doesn’t the anti-surge line return directly to the inlet pipeline of the suction tank? 2. What are the principles behind setting up the line with a check valve? Why is a check valve added? 3. How were the distances of 920 mm from the pipeline below and 400 mm from the tangent to the bottom of the suction tank for the anti-surge line determined?
1. The U-bend is used to store liquid for anti-surge cooling； 2. Principles for DN40 setting: Unidirectional voltage equalization in special cases. During shutdown, the tank pressure is high and the anti-surge valve is open; without this pressure equalization line, the liquid phase may flow back to the compressor outlet through the anti-surge valve. These are just my personal opinions for reference only; feel free to discuss anytime.
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