My case is
Material- Low carbon steel
Applicable code: ASME B 31.3
According to ASME IX QW-403.6, the minimum base metal thickness qulified is the thickness of test coupon T or 0.625" (5/8"), whichever is less. That is 0.5". Therefore, the thickness range 0.25"-0.5" is not qualified.
But the vendor pointed out the the qualified thickness range can based on fabrication code B31.3 Table 323.3.1 which indicates that qualifed thickness range is T/2 to T+0.25".
In this case, what is the minimum qulified thickness: 0.25" or 0.5"? Please advise.
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