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You are right. Thank you so much Do you know why A694 group (as i khow) are not exist in part D table 4/5 but exist in B31 3? Does div2 comeetee have a plan to add them?

The allowable stress in UCI-23 (Su/10) is for cast iron and conservative. I have been using Coulomb-mohr safety factor for years for above epoxy insulator and the equipment has been working without problems for a long time in gas distribution piping system.

Thank you TGS4 I got it. But some common used ductile materials such as A694 (for high pressure fittings) are not present in asme. You mean I can't perform FEA for them according to VIII-2 part5?

Know If you are agree Is the maximum stress theory sufficient for the brittle material (max principal stress <Su), or should a more conservative theory coulomb mohr safety factor be used?

Good question. Generally, I design pipeline equipment which are made of steel. So the code is viii-2. Preparing Elastic-plastic analysis, local failure check, ratcheting check etc. But in this case i have brittle parts inside the steel parts. Brittle part is Astm D709 G10 with Su=275 and Sc=414...

The purpose of EP analysis is to evaluate protection against plastic collapse. What do you think if i assign ep material for that brittle parts and run up to convergence and approving metallic parts. Then Check stresses for that brittle material separately in simple elastic analysis with that...

As you can see, green parts are brittle. Please help me for E-P analysis. https://files.engineering.com/getfile.aspx?folder=74bf089d-4e77-4bca-b322-e199c37ec3ae&file=IMG_20240622_021004.jpg

Hi, I have a project which is a part of pipeline equipment (insulation joint) that contains a brittle filler between metallic parts. How can i perform elastic-plastic analysis? Is it possible to use perfect plastic for that material?

Thank you so much. It was very important for me because in my case, the pressure difference in design and operating mode was very high.

Design code is asme viii-2. I want the exact paragraph that mentioned operating pressure for ratcheting . I can't find that in 5.5.7

Sorry would you tell me the reference code? And Why we use design loads for elastic ratcheting criteria (PL+Pb+Q) instead of operating loads related to your answer for elastic-plastic analysis?

Asme viii div2 part5 elastic-plastic ratcheting

Hi Please tell me in order to evaluate elastic-plastic ratcheting in a vessel, which kind of load should be considered, Design pressure or operating pressure? Thanks

Hi, Can anyone tell me a procedure to design an Equal Tee? The client has been asked us to consider proof test according to MSS-SP75 rely on actual ultimate strength. So i performed an Elastic-Plastic FEA according to ASME viii-2 but the Tee will shakedown because of the high proof test...

I mean stress concentrations in discontinuities for example where the hub rings attached to the pipeline. In elastic analysis for hydrotest, code told that we have not to consider local and secondary stresses but what about E-P analysis ? Let me review: A-The design pressure is 2000 psi. For...

Dear TGS4, Thanks a lot for your advises but we can not attend in such courses because of US unjust sanctions! leave it over. As you told, I found new rule for testing in 2017' edition which in my case it is equal to 1.69Pt + Wpt for global criteria. But a question still exists: I have a...

Thanks but Please adress the pressure test rule in part5. Is it in 2019 edition of asme? I remember that I have read a thread which you(tgs4) told that '' we are working hard to add pressure test rule in 2019 edition''. Please inform me because i don't have an access to training courses in US. I...

I just want to design an equipment via FEA according to viii div2 part5. As you know there is no exact rule for hydrostatic test in part5. How we can use B31.8 rule for protottpe test in fea?

Hi, According to B31.8 para 833 we have to consider bending moment on pipeline equipment such as Insulating Joints. So we perform hydrostatic pressure + Bending test on a prototype equipment. The question is "how to use div2 part5 criteria in such test?" and "how to interpret the stresses...

I have analyzed an E-P 3D model and the solution has converged. Stress-strain data droved from Annex 3-D of ASME VIII-2. But i saw while equivalent stress reached the ultimate tensile strength limit (sigma uts,t) in time step 0.85 , the plastic strain is 0.12 . Also in time step 0.93 the stress...