Regarding the issue of the minimum nominal thickness for SW6-2011
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When using sw6-2011, entering a nominal thickness of 2.0 resulted in an unqualified calculation result, with a message indicating that the minimum nominal thickness should be no less than 3 (the material selected was 304). GB150 does not specify the minimum thickness of the shell after processing, excluding the corrosion allowance: a) For containers made of carbon steel or low-alloy steel, it shall be not less than 3 mm ； b) For high-alloy steel vessels, not less than 2 mm. For material S30408, can any value greater than or equal to 2.0 be entered? Subsequent testing showed that when a nominal thickness of 2 to 2.5 was entered, the requirements could not be met, resulting in failure.
This minimum thickness is somewhat different from the requirements specified in GB/T150. This minimum thickness represents the minimum stiffness requirement during the manufacturing process; it is related to the diameter of the container, being roughly a few thousandths of the internal diameter of the container. There are regulations set out in the Ministry of Chemicals’ standards – you can take a look to find out more.
The nominal thickness is different from the minimum thickness of the shell after machining, excluding the corrosion allowance; the former includes a negative deviation...
Could you tell me the specific standards? Thank you