Good day.
I have this result for stress analysis of burried preinsulated piping. ASME B313.3 was used.
* Node 3500
OPERATING STRESS - 58,945 psi (NO CODE STRESS CHECKED)
SUSTAINED STRESS - 1,942.1 psi (ALLOWABLE - 20,000 psi)
EXPANSION STRESS - 45,485.8 psi (ALLOWABLE - 48,712 psi)
Now my question is:
How come the OPERATING STRESS is higher than the SUSTAINED & EXPANSION LOAD CASES.
Thanks.