B474-UNS08825 welded pipe instead of B705-UNS08825

[Metma]

Dear All ,

In ASME B 31.3 -2012 edition, we found that allowable stress for B705 material is availble in TABLE A-1, but for B474-UNS08825 not available.
In this concern, as we have calculated the Thickness of pipe based on the allowable stress for B705. can we accept the deviation of B474 pipe ( both pipes are with 100% X-ray).

Requsting you to share your experience in above case.

Regards,
METMA

 

[metengr]

You need to review ASME B31.3 for materials which do not have allowable stress values and how you go about using them. ASME Section II does not list SB-474 and would not permit the use in a pressure retaining application - such as pipe or other pressure retaining item.

However, your construction code is B31.3, and you need to familiarize yourself with options for using materials not listed in Table A-1, and not simply consider materials in different specifications equivalent. At this point, if I were the client I would say no to your request.

 

[metengr]

See if you can certify the B-474 material to B/SB-705.