Thermal displacements are generally associated with specific operating conditions. D1 is applied with T1, D2 to T2, and so on. When one temperature is below ambient, and one is above ambient, you can determine the full expansion stress range.
L1 |
W+T1+D1+P1 |
(OPE) |
L2 |
W+T2+D2+P1 |
(OPE) |
L3 |
W+P1 |
(SUS) |
L4 |
L1-L3 |
(EXP) * effects of D1 and T1 |
L5 |
L2-L3 |
(EXP) * effects of D2 and T2 |
L6 |
L1-L2 |
(EXP) * full expansion stress range |
* Use the algebraic combination method in the Static Analysis - Load Case Editor dialog box.
Include the thermal displacements in the operating cases as shown for piping codes with no expansion stress computation.