Centrifugal compressor piping issues
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I recently encountered a problem and would like to ask the experts here: Reducing diameters are installed on the inlet and outlet piping of centrifugal compressors. It is said that this is done to prevent surge at the inlet and to control pressure at the outlet. I’m not sure if this explanation is correct According to this, should imports increase or decrease? Is it really necessary to have pressure buildup at the outlet?
In my opinion, since one isn’t involved in design either, there are many such problems; it’s best to ignore them. If these people can explain it to you clearly, he won’t carry out the operation. Actually, I don’t understand it either; let me try to explain. The cross-sectional areas at the inlet and outlet of the compressor itself are already determined. These areas are set according to the requirements of fluid flow during compression and expansion, based on the flow velocity, resulting in varying diameters along the different sections. This change is an excessive continuation for transportation and other reasons. If there is a sudden change in diameter, vortices will be generated in the fluid. I’m not sure if this understanding is valid; the internal structure of the compressor, including the volute, is designed in a shape that facilitates expansion. There are also reduced-diameter transition pipes at the inlet. For reference.
The inlet pipeline should have a diameter that is 1.5 to 2 times the pipe diameter at a distance of 1.5 meters from the inlet valve; within 1 meter in front of the inlet valve, it should be a straight section with the same diameter； The outlet valve to the pipeline network should have a diameter that is less than or equal to that of the outlet pipe connected to the main pipeline