I found the CAESAR results of version 5.3 (pipe code B31.3-2008) and version 6.1 (Pipe code B31.3-2010) are almost same. as per the piping code updates from B31.3 - 2008( without implementing B31.3 code case 178) to B31.3 - 2010, the longitudinal stress for sustained load (SUS) are supposed to be changed, doesn't? or am i over looking something?

when i referred quick reference guide for both versions, the stress equations and load case used by CAESAR are same.

What is the major stress related difference between ASME B31.3-2008 and ASME B31.3-2010?