What is the significance of emphasizing the main pressure-bearing components in pressure vessels?
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What is the significance of emphasizing the main pressure-bearing components in pressure vessels? For example, taking over those with a diameter of DN250 or more – is it irrelevant for smaller ones? I’ve never understood its meaning. Who wants to say it?
Of course it makes sense. Firstly, the main compressive element, as compared to other compressed components, is certainly subjected to higher principal stresses; if this element fails, it can directly lead to the failure of the entire device. Furthermore, the definitions of the two important legal concepts of “major repair” and “modification” are both based on changes in the main pressure-bearing components; for example, replacing a cylinder section constitutes a major repair, which requires a qualified repair facility and subjecting the work to supervised inspection ； But if you replace it with a DN50 fitting, this is considered a routine repair and no notification is even required.