Local resistance of expansion joints
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When calculating the resistance of gas pipelines, HGT20570.7 is primarily used as a reference; it provides formulas for the local resistance of commonly used pipe fittings. However, since there is an expansion joint in the pipeline now, how should the local resistance coefficient be determined? Are there any experts from design firms or anyone else who has encountered a similar problem? I would be extremely grateful if you could offer some guidance.~
It depends on the type of expansion joint; it’s best to consult the drawings for the expansion joint, as it is primarily determined by the structure of its guide tube. For axial expansion joints, the guide tube is a straight section of pipe, and it can be considered as if no fittings are present in the pipe. For horizontal and angular type guide tube structures, the design is special and depends on the specific circumstances.
But how should we consider the waves in the middle? I wonder if it’s a straight pipe?
When there is a guide tube, waves do not exert resistance on the flow of the medium, so there is no need to consider ripples. Please find a drawing and study it carefully.