The calculated thickness of a bolted circular flat cover is less than the thickness of the flange to which it is connected
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When calculating the flat cover of a bolted circular pressure vessel, sometimes the calculated thickness of the flat cover is less than that of the flange to which it is connected (because the thickness calculated according to clause 5.9 of GB150.3-2011 refers to the thickness of the pressure-bearing flat cover, not that of the flange). At this point, whether the flange of the flat cover (which is thinner) can meet the sealing requirements. What should be done in such a situation?
Generally, the thickness of a flat-face flange ring should not be less than 0.6 times the thickness of the flange it is paired with, which usually meets the sealing requirements.
Hello, the answer is very helpful. Is this based on experience or is there some other basis?
Hello, I couldn’t find the calculations for the flat cover of a circular pressure vessel connected by tank bolts in SW6-2011. Where did you carry out those calculations?
Flat covers connected by bolts are calculated using formula 5-35 in GB150.3; the structural characteristic coefficient K in this formula already takes into account the bolt loads during operation and tightening, so the sealing requirements are certainly met. Are you referring to the reinforced circular flat cover specified in 5.9.5?