SIFs are applied to bending stresses seen commonly in ABOVE ground piping systems the B31 codes assume that thermal displacement strains are commonly accommodated by said bending stresses.


Having said this no they do not apply to pressure stress cycling... however some factors very well may and do apply...

FEA may be your best help see PRG research FEPIPE....


Hmm maybe Sect III ("CAESAR II" look at section II NC I want to indicate the CAESAR II indices but instead the bulletin board takes over and renames it CAESAR II, k2) indices????