8% Ni in PV in service less than -275degF

[AvusBlueM3]

Is there anywhere in the ASME Section VIII code which limits the use of 8% NI (SA553 Type II) to vessels in service temperatures higher than -275degF?

 

[metengr]

You mean lower than -275 deg F for Type II (8% Ni content by mass). No, there is no limit but impact testing will be required for lower service temperatures. Please review ASME SA 553 and Section VII, Div 1.

 

[AvusBlueM3]

That is what I was thinking as well. I'm just trying to find documentation on where the industry standard has settled on 9% Ni rather than 8% Ni. Impacts/tensiles improve slightly with the higher Ni content, but I can find any supporting documentation.