I am involved in a calculation which I need to know the total normal stress of each element. I set the load case on OPE and tried to use the "code stress" (according to quick ref. of CII) but, I figured the summation of Saxial+Sbending+PD/4t is different than the given value in code stress column. could anyone clarify?

regards

Try "Maximum Stress Intensity" column.

Dan,

this might be very foolish of me but, Maximum stress intensity represents the maximum shear stress. does'nt it? I am looking for the summation of normal stresses. (axial+bending+PD/4t) but if I calculate it manually I get different answer than the value shown on the "code stress" column once the stress case is set on OPE.

regards

Sorry. I did not paid much attention in what are you looking for.

By default CAESAR II uses P*di^2/(do^2 - di^2) instead of PD/4t. Depending on how far you are from "thin wall pipe", this can make a significant difference. The equation used for the OPE load case can also vary by Piping Code. What Code are you working to?

Richard,

I am using B31.1 since it was the only code I was quiet sure that by setting the case on OPE I would get the total Normal stress in the Code stress column.

regards

PS the design pressure of the system is 320 barg, I believe that explains the huge difference between the values.