UCS 66
UCS 66
(OP)
Hi
I have 16mm SA516 gr 70 N, And specify the MDMT as -50F, but my fabricator say MDMT shall be at -48F only based on UCS66 chart. Fabricator refuse to put -50F as MDMT. Mechanical Consultant say fabricator confuse on the UCS66 meant for Impact Requirement. Which is correct??
I have 16mm SA516 gr 70 N, And specify the MDMT as -50F, but my fabricator say MDMT shall be at -48F only based on UCS66 chart. Fabricator refuse to put -50F as MDMT. Mechanical Consultant say fabricator confuse on the UCS66 meant for Impact Requirement. Which is correct??





RE: UCS 66
For your case, the minimum temperature for exemption to impact testing based on my review of Curve D in Figure UCS-66 is approximately -43 deg F. Lower service temperatures for this material require impact testing.
RE: UCS 66
If that material SA 516 Gr 70N, have been Impact Tested at
-50F then the MDMT -50F is correct.and can be used. right?.
Thanks
RE: UCS 66
RE: UCS 66
Using it in conjunction with fig UCS 66 will surprise you sometimes. Note, you may want to look at UCS 67 there's a nice exemption for welds there too.
Regards.