Thanks heaps for the support and feedback from everyone. Much appreciated and surely makes you feel that you are not alone.

I have another one. I have a set of design temp/pres : 100C/20MPa as well as an operating temp/pres for a system: 20C/30MPa. Furthermore, I have a collected data from several instruments along the system of temp/pres that varies throughout the day. The max actual temp/pres is 90C/35MPa. What I am compelled to use as the temp/pres for the analysis are the maximum from these values being the design temp and actual max pres 100C/35MPa. Would this be a correct assumption? Should I specify a temperature per area of the system that has a different temp/pres max? I'm just thinking though that this will yield a lot of data and case sets. Is obtaining a maximum combination of all expected temp/pres be the correct approach? Thanks!