ASME Section VIII Impact test in UCS 67
ASME Section VIII Impact test in UCS 67
(OP)
Hello
I need your help to solve a discussion. I am working in the fabrication of a pressure vessel under ASME VIII Division 1. The cylindrical shell have a thickness (1/2 in.) and material that not require impact test by UCS-66. However the hemispherical head have a thickness (1 in.) that require impact test by UCS-66. The two parts are welded by a tapered joint, where the weld thickness is 1/2 in. In this case, the governing thickness is 1/2 in.. Do the rules of UCS-67 require qualification with impact testing of the WPS to be used for welding of two parts if neither material require impact test in this governing thickness (1/2 in.)? Many thanks and excuse me by my english. It is not my native idiom.
I need your help to solve a discussion. I am working in the fabrication of a pressure vessel under ASME VIII Division 1. The cylindrical shell have a thickness (1/2 in.) and material that not require impact test by UCS-66. However the hemispherical head have a thickness (1 in.) that require impact test by UCS-66. The two parts are welded by a tapered joint, where the weld thickness is 1/2 in. In this case, the governing thickness is 1/2 in.. Do the rules of UCS-67 require qualification with impact testing of the WPS to be used for welding of two parts if neither material require impact test in this governing thickness (1/2 in.)? Many thanks and excuse me by my english. It is not my native idiom.





RE: ASME Section VIII Impact test in UCS 67
RE: ASME Section VIII Impact test in UCS 67
RE: ASME Section VIII Impact test in UCS 67
If the base materials do not require impact testing, it is not required that the WPS be impact test qualified.
RE: ASME Section VIII Impact test in UCS 67
RE: ASME Section VIII Impact test in UCS 67
RE: ASME Section VIII Impact test in UCS 67
RE: ASME Section VIII Impact test in UCS 67
RE: ASME Section VIII Impact test in UCS 67
Perhaps the problem is my english. Please check this information to understand better my question:
MDMT:-40ºC
Head: SA-516 Gr.70N, thickness = 1" (25 mm).
Shell: SA-516 Gr.70N, thickness = 1/2" (13 mm).
Governing Thicness (weld): 1/2" (13 mm).
Does head-to-shell WPS require impact test?
RE: ASME Section VIII Impact test in UCS 67
So the remaining item is to establish the governing thickness based on UCS-66 {1}{2}{3} as stated above.
{1}(a) refers you to UCS-66.3(a) as I stated in a previous post, giving a governing thickness of 1/2".
{2} deals with castings, so not applicable.
{3} deals with flat non-welded parts such as bolted flanges and flat heads, so not applicable.
Therefore {1} rules your governing thickness (1/2") and it is below the thickness required for impact testing (3/4"). Therefore impact testing of the material is not required, and subsequently not required for WPS qualification as well.
RE: ASME Section VIII Impact test in UCS 67