Compressor changes outlet diameter
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I would like to ask the experts: if the diameter of the compressor’s outlet pipe is small, what negative consequences could arise from increasing the diameter of that outlet pipe?
“If the diameter of the compressor outlet pipe is small, what negative consequences could arise from increasing the diameter of the outlet? ” To address this issue, it is first necessary to determine whether the claim that \"the compressor outlet diameter is small\" refers to a diameter that is below the design parameters, or merely appears small without being confirmed by design considerations. The answer for the former, as stated in the title, aside from wasting material, merely results in a corresponding reduction in pipe resistance. This also involves system design. For reference.
As long as no trap is formed, there will be no problem. Stress calculation may be required for pipeline renovation.
Hello, Haiyou. Due to changes in the production conditions, the pressure at the compressor outlet of my unit remains quite high. To meet the production requirements, we plan to increase the diameter of the outlet pipe. I just don’t know if this will affect the compressor’s performance. My unit is equipped with a five-stage compressor; currently, the outlet pressure of the third stage is high. I plan to increase the diameter of the outlet pipe for the third stage, but I’m not sure whether this will affect the performance of the fourth stage.
Hello, Haiyou. We haven’t taken stress changes into account yet. It’s a five-stage compressor, and currently the outlet pressure at stage 3 is extremely high. We want to increase the diameter of the outlet pipe at stage 3, but we’re concerned that this might affect the overall performance of the compressor.
Due to changes in the operating conditions during production, our compressors can no longer meet the requirements of production as per their original design; the outlet pressure at the three stages is excessively high. We have decided to modify the original design by increasing the pipe diameter, but we are not sure whether this will affect the overall performance of the compressors.
If the pressure in one stage of a multi-stage compressor is high, the manufacturer responsible for the design needs to determine whether the capacity of that stage is too high or the capacity of the subsequent stage is too low; simply increasing the pipe diameter is not effective
Check whether there is a discrepancy between the outlet pressure at stage 4/5 and the design pressure; generally, the pressure at stage 3 is higher, which may indicate a problem in the later stages, causing it to generate extra pressure
What does it mean that the original design can no longer meet the production requirements? And what is five-stage compression – is it five stages of compression in series?
Increasing the diameter under high pressure does not necessarily solve the problem. We need to look for the cause in the system process.
The moderator thanks you for your reply. Due to changes in operating conditions, the molecular weight of the feed material has decreased, which results in a reduced rate of gas phase liquefaction between various stages. In order to keep the compressor running, we increased its speed; however, now the compression ratio in each stage has increased significantly, especially at the outlet of the third stage. Sometimes it is necessary to open the reflux valve to relieve pressure. So now, I want to increase the diameter of the three outlet pipes, but I’m worried that doing so might cause problems. For example, as the pipe diameter increases, the gas flow velocity rises and the pressure decreases; could this affect the operation of stages 4 and 5?