Is external pressure vessel suitable for low temperature and low stress working conditions?
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This post was last edited by yong9809003 on 2018-12-26 10:08 Dear experts, could I ask whether the external pressure vessel is suitable for low temperature and low stress working conditions? External pressure vessels bear compressive stress, but the maximum primary overall film stress mentioned in the low-temperature and low-stress conditions in the GB150 appendix should be tensile stress? I'm confused, please clarify, thank you: lol
bg10.png You can refer to the method below for the formula. As for some parameters corresponding to the material, you can correct it yourself according to the latest standards. For other low-temperature information, please refer to: Sharing some information about low temperature--------- https://bbs.hcbbs.com/thread-2180222-1-1.html (Source: Haichuan Chemical Forum Network)
not applicable! The design criteria for external pressure vessels mainly consider elastic and plastic instability, rather than simply following the first strength theory.
The maximum primary overall film stress can be a compressive stress, and the standard stipulates that it is not only a primary overall film stress, but also a total bending stress. External pressure vessels should also be suitable for low temperature and low stress judgment.
I think the low-temperature and low-stress working conditions are based on the maximum principal stress theory. For thin-walled shells that bear internal pressure, the overall primary film stress is the maximum principal stress. Although external pressure vessels may also bear film stress, the film stress is no longer the maximum principal stress, and the failure criteria of external pressure vessels are different from those of internal pressure vessels. Although the standard does not explicitly state it, the low-temperature and low-stress working conditions are obviously aimed at internal pressure vessels.
Is the maximum principal stress necessarily tensile stress?