In CII, I am doing a job for HP steam line. I found that the allowable for SUS load case is 1Sh
and for EXP is Sa (ie) Sa=f(1.25Sc+0.25Sh)
and for OCC is 1.33Sh.
all these are as per code that the software follows. But for HYD load case, it has taken the yield strength (Sy) as allowable. Is it correct?

I guess usually we consider 0.9Sy. am i right?

In this case, can i change the allowable in CII?

kindly explain in deatil.