Hi,
I have a question regarding the "AutoPipe reference information" content about thermal bowing. It is stated that the design temperature should be (T1+T2)/2. In my case a have a temperature gradient of 20 degrees celsius. My minimum design temp is -185 degrees celsius. From the reference information, should the design temp be changed to -175 degrees?
Regards,
Andreas L
Hello Andreas,
Thank you for your question. It is best to remain consistent between the thermal bowing gradient and the design temperature of the point. From what you have provided, I would suggest setting the T1 of thermal bowing to -185C (as it is the minimum design temperature) and the design temperature of the piping point to -175C.
BestJosh T
Hi Joshua,
Thanks for answering my question.
If I understand you correctly, please correct me if I'm wrong. I define two thermal load cases; T1 = -185 deg which is selected for the thermal bowing, and T2 = -175 deg which is the design temperature of the piping.
Andreas
The thermal load cases are only used to provide the instantaneous expansion coefficient for the bowing calculations - they are not used for the fluid temperature nor the temperature at the top of the pipe. Note that thermal bowing is applied to the entire analysis set, including all thermal load cases enabled for that set and needs to be checked in the Static Analysis Load Cases dialog.
Agreed. I'm just a little confused where to define the design temperature of the piping point to -175C, My initial thought was to assign the thermal bowing to load case T1 (-185C), and define a temperature gradient of 20C. But after reading the reference information I was unsure if this is the correct way to set up the thermal bowing load case.