In CAESAR II help for subject, it is given:
"B31.3 states, "The sum of the longitudinal stresses due to pressure, weight, and other sustained loadings (S1) and of the stresses produced by occasional loads such as wind or earthquake may be as much as 1.33 times the allowable stress given in Appendix A. Where the allowable stress value exceeds 2/3 of yield strength at temperature, the allowable stress value must be reduced as specified in Note 3 in 302.3.2." The default for B31.3 applications is 33%. If this is too high for the material and temperature specified, then a smaller occasional load factor could be input."
In ASME B31.3 2014 edition, I could not find the note 3, or any other point stating that occasional load can be reduced based as stated above.
So is this help updated or needs to be updated.
Correct me if I am wrong.
For elevated temperature there is a clause in ASME B31.3 (302.3.6) whereby it is stated that allowable value can be reduced. But for other temperatures no such permission is given.
Kindly give your opinion.
_________________________
Shahid Rafiq