Dear all
We are dealing a 10” line with normal operating temperature 250 deg C and there is one transient temperature of -50 deg C.
We are checking expansion stress range from
1) 21 deg to 250 deg C &
2) 21deg to -50 deg C
Do we really require to add both the stress to get total stress range i.e . from -50 deg C to 250 deg C.
Off course if we do that will be very safe play. But whether it is mandatory to do the same.