Thanks Spoonful,
FYI the MDMT must be colder than the design temp which is -29oC.
Happily I now have clarification from a AS1210 Committee member that it is acceptable practice in this instance to use the value at the 40mm ordinate. This is good as it gives me a Tr of approx -29.5oC.
Curve used...
I have a pressure vessel design to AS1210 Class 1, wall thickness t2 of 25.4 with a set in nozzle of wall thickness t3 of 71.3, nozzle and shell material are A350 LF2 CL1 (impact tested 20J at -46C which equates to 27J at -41C).
AS4458 will allow me to do this as an AS-WELDED construction since...
