Thanks DSB123
Obviously the system in question does have Design Temps and Pressures quoted of +75deg C and 45Barg. However, the worst case of coincident operating temp and pressure are +55deg C at 27barg.
If the design values were used in the analysis then the output would throw up inflated...
I have been trying to find in the piping design codes [ASME B31.3,B31.1] where its states the actual temperatures/pressures to be used in carrying out a stress analysis of a piping system. There appears to be 2 different schools of thought.
1. Use the design figures of actual piping materials...