Hello,

I have question regarding load case L2-L4 (T1-T2)
Do we have to use this load case because i have
Temp 1 -300 Deg F
Temp 2 350 Deg F

Using the above load case the system fail. The Delta T is 650 Deg F
Is it possible that the system will see such a high change in temperature.

Does B31.3 states that we have to use the L2-L4 case to satisfy the code

Thank you for your help.