When in a vacuum state, is it necessary to perform calculations regarding the use of container flanges for pressure vessels?
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When the vacuum level is -0.1 Mpa, is it necessary to perform calculations regarding the use of container flanges for pressure vessels? ! !
If the equipment is made of carbon steel, there’s no need for calculations – just select it directly
In a vacuum environment, it seems to be more advantageous for sealing. In terms of strength, the male thread grade is definitely greater than 0.1; by analogy, the strength should also be fine
I encountered a case involving a shell-and-tube heat exchanger with a fixed tube sheet, used for heating water with steam. With normal water supply, when the steam inlet valve suddenly closes, leakage occurs at the tube sheet flanges and the tube sheet; it lasts for about a few minutes before stopping. This situation occurs every time the steam is shut off. Our analysis suggests that it is due to the sudden condensation of steam, which creates a partial vacuum in the shell side; this leads to slight deformation of the tube sheet, thereby affecting the seal and causing leakage.