Calculation of negative pressure pipeline wall thickness
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I’m currently looking at the calculations related to negative-pressure pipelines in GB 150; as for the cylindrical calculation length L, how should it be determined for pipelines? The examples all involve devices. When determining the pressure-rated class of a pipeline, one certainly does not yet know the maximum length of the straight sections in that pipeline. So, how is L determined? I would appreciate some guidance from experts, thank you!
Use SW6 to calculate it for this equipment-finding task; it’s simple
The external pressure calculation involves the values shown in the image, while the internal pressure calculation does not involve length, right?
Negative-pressure pipes need to be made into short cylinders using reinforcing ribs; without such ribs, the cylinder remains a long cylinder, and its pressure-bearing capacity is generally very low； Both the length-diameter ratio and the diameter-thickness ratio of the short cylinder have an impact; stability needs to be calculated, and there is more than one design option that meets the requirements