Calculated length of a cylinder with external pressure and double saddles
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Hello everyone: How is the calculated length determined for a double-saddle cylinder under external pressure? Thank you!
The calculated length of horizontal vessels is independent of internal and external pressures； If it is to calculate the self-stability of a cylinder under external pressure, the spacing between stiffening rings needs to be considered
The method for determining the length is the same
GB/T150.3 explains it very clearly
I’ve been working on the design of a pressure vessel under external loads these days, so I’ll say a few more words on this topic. The strength of such vessels also needs to be calculated, but stability verification is essential. For stability verification, it’s necessary to first determine the calculation length; as mentioned in the question, \"the calculation length for a cylinder should be the distance between two adjacent support lines on the cylinder.\" For more details, refer to section 150.3, paragraph 4, and Figure 4-1. There is definitely a type among those included that will suit you. Then, depending on the ratio of the cylinder’s outer diameter to its effective thickness, and using 20 as the dividing point, two verification methods are employed. These are set at 150; go through them step by step and you’ll understand. Simply put, stability verification involves following established methods; all the charts and data come from the results of numerous practical projects carried out over many years by previous experts. One more thing: as long as there are the necessary equipment and materials along with corresponding diagrams or tables, the design of pressure vessels becomes very simple once you become familiar with it. What’s difficult is that the material is beyond the syllabus; that’s the real challenge~
In my understanding, the calculated length of a pressure cylinder under external pressures is determined using the methods specified in GB150; it has little to do with the use of double saddles. The areas where the saddles are welded to the cylinder body cannot be considered as reinforcement elements. The saddle calculation can be done in SW6; for the length, simply use the total length of the round conduit, as there is no need to calculate it separately.