Fluid flow velocity in the inlet and outlet pipes of the compressor
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For the inlet and outlet pipes of a gas compressor, the inlet pipe is definitely thicker while the outlet pipe is thinner. So, is the flow velocity inside the pipes the same? (It’s a bit chaotic at the design pressure and flow rate; seeking solutions.)
This is definitely different. The selection of the pipe diameter should be systematic, with choices made from existing series ； There is a temperature rise at the compressor outlet, and the outlet is not necessarily smaller than the inlet.
Thank you for your answer. I remember now; the pipe diameter isn’t chosen arbitrarily – it seems that all the pipe diameters I’ve seen are multiples of 5. The measured flow rate will change after compression. If the rate of change in the pipe diameter does not match the rate of change in the measured flow rate, then, based on the formula velocity = flow rate/pipe area, the velocity will also change. Is this understanding correct? One more question: for the pipes that lead in to and out of the cooler, the pressure and flow rate should remain unchanged, and the pipe diameter seems to stay the same as well; therefore the flow velocity remains constant. So what changes do occur as a result of the temperature drop? Has the intensity of molecular thermal motion decreased? Please help, thank you.
For the pipes entering and leaving the cooler, the flow rate remains unchanged, the pipe diameter can stay the same as well, and pressure changes can be ignored. In this case, as the temperature drops, changes in flow velocity can be ignored for liquids, but not for gases.
Personal understanding: The design of the pipeline flow rate is based on the requirements of relevant standards. Compression causes a temperature rise, but a cooler should be used to lower the temperature. The linear speed should be roughly the same; the higher the pressure, the higher the linear speed should be, as the pressure drop in the pipeline is then a smaller proportion, having less impact on the process, which is acceptable. Low pressure has a significant impact on the process, so the line speed is kept low.
For gases, if the pipe diameter remains constant and the flow rate remains constant, then the flow velocity should also remain constant, right?
Since the flow rate must be converted to standard conditions, changes in temperature have no effect. Changes in temperature affect the nominal flow rate, meaning that the flow rate varies under different temperature conditions.
I have seen cases where the outlet is thicker than the inlet. Why was it designed this way, and how was that decision made?
Why is the outlet of the compressor larger than the inlet? Both of our compressors have an outlet that is larger than the inlet; we don’t understand what’s causing this
I have a question: why is the outlet diameter smaller than the inlet diameter when there is a temperature rise? Both of our compressors have relatively large outlet diameters