Impact Testing Requirements Per Section VIII UCS66
Impact Testing Requirements Per Section VIII UCS66
(OP)
I am reviewing weld procedres from a vendor fabricating a vessel for me from A516 Gr. 70 c/s. The wall thickness of the vessel is 1 1/4". The procedure that has been submitted does not include impact testing. My question is:
My MDMT is 0°C. It appears to me that impact testing is required per UCS-66 at that temperature. I don't comply with all rules of UG-20(f) (nominal thickness>1"), so that does not allow me to take exclusion to the requirement. Am I missing an exclusion for the impact testing, or is it really required?
Also, it would appear to me that the plate used would need to be normalized.
This is not my area of expertise, so I appreciate any assistance and advice that anyone is kind enough to share.
My MDMT is 0°C. It appears to me that impact testing is required per UCS-66 at that temperature. I don't comply with all rules of UG-20(f) (nominal thickness>1"), so that does not allow me to take exclusion to the requirement. Am I missing an exclusion for the impact testing, or is it really required?
Also, it would appear to me that the plate used would need to be normalized.
This is not my area of expertise, so I appreciate any assistance and advice that anyone is kind enough to share.





RE: Impact Testing Requirements Per Section VIII UCS66
The MDMT rating/impact test exemption is based on the "basic rating" taken from Fig UCS-66 for the nominal thickness. For 1.25" curve B material this is 43° F. If there is excess thickness over that required for pressure and other loads then this temperature can be further reduced by Fig UCS-66.1.
Depending on the thickness required for pressure it seems reasonable to exempt this material to the 0° C.
RE: Impact Testing Requirements Per Section VIII UCS66
RE: Impact Testing Requirements Per Section VIII UCS66
RE: Impact Testing Requirements Per Section VIII UCS66
Steve Braune
Tank Industry Consultants
www.tankindustry.com