Dear all,
I want to know if the consideration of "Bourdon effect" in Thermal calculation for Autopipe with B31.3 is mandatory or not.
I seached "Bourdon effect" in B31.3. But I could not find the necessity of including bourdon effec in thermal calculation.
I can find can be calculated with considering "Bourdon effect" in Autopipe as option. And Caesar II can be calculated as default.
But I don't know it's mandatory or not with B31.3.
Regards,
Dear Mike-san,
I hope someone's experience, but I will search more by myself.
Thank you for your reply.
Best regards,
Hi,
For B31.3 reference review this Eng-Tips forum post: https://www.eng-tips.com/viewthread.cfm?qid=6924#:~:text=The%20Bourdon%20effect%20describes%20the,is%20as%20described%20by%20Electricpete.
It refers to Appendix D which has been since then replaced by ASME B31J. Review Note (4) of B31J. There's a formula which modifies the stiffness of your elbows.
But since your piping is GRP, I would also have a look at ASME NM.2 which is the new-ish FRP standard for piping. NM.2 has formulas for calculating SIFs for elbows which are dependent on pressure. It might be a good question for the NM standard committee to confirm whether the Bourdon effects are included in the NM SIF formulas.
Also because your piping is GRP, thermal stresses are typically included in an operating stress combination rather than evaluated separately as done with metallic piping. There's a number of analysis requirements for GRP piping, review the AutoPIPE guideline for non-metallic if you haven't already and I also recommend picking up a copy of E-433 - Pipe Stress Analysis Info from RPS Composites. The details (SIFs, thicknesses etc.) won't be specific to your application but it has very good info. You can request one from here: https://rpscomposites.com/contact/ .
Sean
Dear Sean-san,
I completely got answer from your advise.
Thank you so much.