UCS 65 Lowest Impact Test Temperature
UCS 65 Lowest Impact Test Temperature
(OP)
Code: ASME VIII Div I
Will I be correct in saying the lowest impact test temperature I can subject A516 Gr70 plate to is -105 degC?
Thanks in advance.
Will I be correct in saying the lowest impact test temperature I can subject A516 Gr70 plate to is -105 degC?
Thanks in advance.





RE: UCS 65 Lowest Impact Test Temperature
As an example discussed by K.R. Rao in the Companion guide (viewable in goggle books) pg 74. Example: MDMT is 30F and the vessel is subject to a decrease in temperature due to the stress ratio of 100F, therefore the allowable operating temp is -70F, but this is below the mandatory impact test temp. of -55F. So impact testing is required, but only at 30F, and the vessel is safe for -70F. (This was clarified in Intrepretation: V111-1-89-268).
RE: UCS 65 Lowest Impact Test Temperature
SA 516 Gr.70 plates would not impact tested to this low temperature. Vessel having MDMT of -105 Deg C will not be of SA 516 Gr 70 plate.
Have a look at SA-20 which gives generally available thickness and minimum test temperature combinations meeting charpy V- notch impact requirements.
RE: UCS 65 Lowest Impact Test Temperature
No, this statement makes no sense because you have no mention of MDMT and thickness. Go back and review UCS-66.
RE: UCS 65 Lowest Impact Test Temperature
Assume MDMT -105 degC.
Bushan76,
I know this is extreme cold temperature, but the question is, can 516, 70 be used or allowed for this purpose subjected to acceptance of impact test.
Thanks in advance.
RE: UCS 65 Lowest Impact Test Temperature
RE: UCS 65 Lowest Impact Test Temperature
Steve Jones
Materials & Corrosion Engineer
http://www.oilandgaspeople.com/cv/11499664
http://www.linkedin.com/pub/8/83b/b04