When including Temperature (T3 = 400 deg C) in the Hydrotest load combination, the stresses are massive. Without it they are tiny. Why?
Example:
Hydrotest Load-case with No Thermal
Hydrotest Load-case with Thermal
Why are the Code combination results for Hydrotest load-case with Thermal added so much more than when Thermal was not considered?
From AutoPIPE help on Hydrotest:
Perform a Test to simulate this load combination:
Step #1. Changed all spring hangers to v-stops.
Step #2. Set T3 to 500 C ( 400 x 1.25).
Step #3. Set P3 1.25 N/mm2 (1 x1.25).
Step #4. Crete a new code stress combination, GT3P3.
Step #5. Analyze the model and review the results.
Note, Similar results, both very extreme because of the rigid restraints and thermal growth.
"Code Compliance" sub-report using Results> Output Report
Bentley AutoPIPE