Hello,

I'm analyzing a steam vent line which vents to atmosphere. My question is how do I set up the load cases. Due to design pressure for steam venting, there is a 55,000 LB thrust force at the vent pipe exit, which results in an F1 in my design operating load case. But what about in the Sustained Case? Should it include the thrust force (F1) or remain W+P1?

My load cases are below, but I'm questioning the need for the force to be considered in the sustained case.

1 W HGR
2 W+T1+P1 HGR
3 W+T1+P1+H+F1 OPE
4 W+T2+P2+H OPE
5 W+P1+H+F1 SUS
6 W+P2+H SUS
7 W+T1+P1+H+U1+F1 OPE
8 W+T1+P1+H+U2+F1 OPE
9 L3-L5 EXP
10 L4-L6 EXP
11 L7-L3 OCC
12 L8-L3 OCC
13 L11+L5 OCC
14 L12+L5 OCC

Thanks,
Dmitriy