Dear Sam,

I am so sorry I miss the point here. If we push F1 in Caesar regarding to pressure input, yes operating pressure required. Calculating pipe wall thickness design pressure required said by Code.

But many of us maybe (i am also/ sometimes client ask too) put P operating P1, and P design P2. In many times I run it as you also see that by using P design P2 generate higher stress ratio in SUS and OCC stress.

Coade provides 9 possibilities variation of pressure just because the line possible to have 9 operating condition or more. But we fill P design sometimes in the field. Software cares not is it P design or P operating. It only takes the value.

(In my opinion); sometimes I think P design is pressure that may be reached in the line (anticipation). The pressure not guaranteed fixed in one value I think, even not like a cyclic load. What the other think? I would like to know he...sorry if I am wrong.