Mr.Dave, my main point question actualy are:

1)why for combination case we do not look for the Force, Moments and Displacement? In TOTAL piping stress design basis there are a point that said:

Php Code:
CONTACTOR shall check that under sustained loads combined with seismic acceleration, wind and dynamic loads, the deformation of piping is limited to 20 mm in horizontal and vertical direction including piping weight effect.


it is clearly ask for the displacement check for SUS+OCC limited to 20 mm in horizontal and verical including weight effect.

2)From my previous question that you have not answer is for case 20, is it true or false if i combine the OPE again like in case 20 below:

Case 2 = W+T1+P1 (OPE)
Case 3 = W+T2+P2 (OPE)
Case 4 = W+T3+P3 (OPE)
Case 5 = W+P1 (SUS)
Case 6 = W+P2 (SUS)
Case 7 = W+P3 (SUS)
Case 8 = W+T1+P1+U1
Case 9 = W+T1+P1+U2
Case 10 = W+T1+P1+U3
Case 17 = L2-L8 (OCC) ALGEBRA
Case 18 = L2-L9 (OCC)
Case 19 = L2-L10 (OCC)
Case 20 = L17+L18+L19 (OCC) SRSS
Case 21 = L2+L20 (OPE) ABSOLUTE
Case 22 = L5+L20 (OCC) ABSOLUTE