Issues regarding the marking of stainless steel head thickness
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I’m a complete novice when it comes to pressure vessels, and I have a small question for the experts here. The thickness of the head is indicated as 10(8): 10 represents the nominal thickness, while 8 represents the calculated thickness plus the corrosion allowance. Since stainless steel heads don’t require a corrosion allowance, is it sufficient to indicate only the calculated thickness in the parentheses? Marking on stainless steel heads: nominal thickness (calculated thickness)
The value in parentheses represents the minimum forming thickness, which is a requirement imposed on the manufacturers of end caps. Using the design thickness as the minimum forming thickness is acceptable, but this gives an advantage to the manufacturers of end caps at the expense of those who use the containers; it depends on how the designer balances things out. For stainless steel, a corrosion margin of 0 is generally adopted, with the design thickness equal to the calculated thickness.