specified thickness?
specified thickness?
(OP)
I am analyzing a component in accordance with the BPVC, which I am not very familiar with, and I'm stuck on practically the first paragraph. UG-4 says materials subject to pressure stress shall conform to Section II, Part D, Subpart 1, Tables 1A, 1B, and 3, which list material properties. In Section II, I find materials, strength properties, and a "specified thickness," which I couldn't find an explanation of. Does this mean materials which exceed the specified thickness are forbidden by the code? For example, 6061-T6 has a specified thickness of up to 0.249. Does this mean I can't use half-inch thick 6061-T6 in a pressure vessel? Why? I don't know why that would be more unsafe than 0.249-inch-thick 6061-T6.





RE: specified thickness?
Your post lacks information. After reading UG-4 in ASME Section VIII, Div 1, what I believe you are asking is in reference to the statement below;
By the way (1) is a footote, please read it below
1 In some instances the limitations of the scope clause in the material
specifications are based on a very realistic maximum. It is recommended
that the designer and/or fabricator confer with the material manufacturer
or supplier before proceeding, thus assuring himself that except for size
or thickness, all requirements of the material specification will be met
and so certified.
I will let you read and digest the above. Now review one or more ASME Section II material specifications that provide mechanical property requirements based on thickness limits and/or size.
RE: specified thickness?
RE: specified thickness?
ASME B&PV Code has escape clauses and exceptions. The thickness limitations in Tables 1A, 1B in Section II are there because during review and qualification of this material by Section II Subcommittee, the submitter for this material could not guarantee mechanical properties or chemical composition or both for thicker or larger diameter sections.
RE: specified thickness?