The B31.3 committee has handed down more than one interpretation that states that the sustained stresses shall be evaluated in all conditions.

If you are evaluating a line per B31.3 you are required to evaluate your sustained stresses Hot Cold or in-between.

Is this done? My guess would be that 80% of the time it is done incorrectly and people when told they performed the work incorrectly automatically blame the computer software (such as Mr. Peng does). The last time I checked I found the computer did only what I told it to do! In this particular case for instance the designer asked about support lift-off on a system that should be strapped down in all 6 DOF at least at one point. The computer does not know these things humans are supposed to and direct the computer towards a correct solution….

8 out of 10 analysts probably miss this…..