engineermat
Mechanical
This is a question about the impact test carbon steel piping (Low Temp. Carbon Steel). The fabrication code for Low Temperature Carbon Steel is B31.3. The vendor is planning to use a 0.5" thick pipe to qulify the piping thickness range from 0.25"-0.75".
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.
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.