Not logged inAmerican Welding Society Forum
Forum AWS Website Help Search Login
Up Topic Welding Industry / Technical Discussions / Hoop Stress
- - By PipeIt (**) Date 10-27-2009 18:33
What is the definition of hoop stress in a pipe line?

The application is running a carrier pipe through a casing pipe under a rail road this is new to me.

Any input would be appreciated.

Thanks
Parent - - By ssbn727 (*****) Date 10-27-2009 20:32 Edited 10-28-2009 13:26
Hi PipeIt!

Here are some links hte explain the mathematical formula's for different situations where hoop stress can build up and how to calculate for design as well as a link to a software tool to figure out all kinds of stresses as well as other types of situations when one is designing a piping system.. In short, most if not all of the links cover Hoop stress as it relates to metallic piping and some will explain it better than others. ;0

http://en.wikipedia.org/wiki/Cylinder_stresses

http://www.efunda.com/formulae/solid_mechanics/mat_mechanics/pressure_vessel.cfm

http://www.engineeringtoolbox.com/stress-thick-walled-tube-d_949.html

http://www.tech.plym.ac.uk/sme/Interactive_Resources/tutorials/FractureMechanics/Fatigue/Solutions/Solution1.htm

http://www.pipestress.com/papers/UnderGrd-1.pdf

http://www.ndt.net/article/defektoskopie2008/papers/269.pdf

http://www.iasmirt.org/SMiRT15/B06-3

Here is some really good piping stress analysis software from Bently named AutoPipe:

http://www.bentley.com/en-US/Promo/AutoPLANT/integration+STAAD.Pro.htm?skid=CEO_NA_GOOG_APSTAAD_09&WT.srch=1&gclid=CImd59Hr350CFdFL5Qod1V_kLg

Here are some other articles that may or may not be helpful since I really don't know exactly what you are looking for:

http://www.isope.org/publications/proceedings/ISOPE/ISOPE%201998/Paper/Volume%202/I98v2p82.pdf

http://www.adpf.ae/images/Page-C.pdf

http://openlearn.open.ac.uk/mod/resource/view.php?id=211587

I have more but first, I'm going to post about a book I just found that will definitely be of everyone's interest in here so, I apologize for not being as thorugh as I usually am.
Rest assured that when I complete the new post, I will return to give you some more links to look at so you vcan have as much resources available in order to get a better understanding what Hoop Stress is all about and how it relates to your application. ;)

Respectfully,
Henry
Parent - - By PipeIt (**) Date 10-28-2009 11:08
Great thanks Henry! :)
Parent - - By ssbn727 (*****) Date 10-28-2009 14:52 Edited 10-28-2009 16:01
Here are some more:

http://www.arcbends.com/finite.htm

This one is one of my favorites regarding fracture mechanics on pressure vessels and piping form Walter Sperko:

http://www.sperkoengineering.com/html/articles/How%20good%20do%20Welds_.pdf

This one is from the NRC:

http://www.iasmirt.org/SMiRT16/J1619.PDF

This one is from what was known back then as the Atomic Energy Commission:

http://www.osti.gov/bridge/servlets/purl/4776601-OCrMUl/4776601.pdf

This one is from a company in Germany that makes cladded thick wall pipe, and shows how the effects of PWHT as well as a technique named "impansion can alter the hoop & Axial stress at the seam of the pipe in comparison of the two methods of stress relief, and shows a distinct difference in outcomes depending on hte alloy being stress relieved using the two techniques:

http://www.voestalpine.com/grobblech/de/company/overview/news/00.ContentPar.62231.File.tmp/B8_Reichel_Clad_pipes_-_Control_of_residual_stresses_and_improvement_of_dimensional_tolerances_.pdf

Here are some more articles:

http://www.zju.edu.cn/jzus/2000/0002/000206.htm

Here's an article that shows some good picture of compression failures in pipe sections:

http://www.edmsvc.com/assets/files/Pipeline%20Operations-Improving%20Pipeline%20Design.pdf

An oldie yet a goodie:

http://www.pipestress.com/papers/Pressure-Elong.pdf

Here's a really good article with both a downloadable .pdf and Applet download to help you calculate allowable pressure according to ASME B31.3:

http://www.lightmypump.com/help15.html

This one is from the Alaskan Arctic Pipeline Workshop:

http://www.mms.gov/tarworkshops/WorkshopPages/PipelineWorkshops/workshop%2025/Presentations/SmithPaper.PDF

This one is from the Edison Welding Institute:

http://www.mne.psu.edu/michaleris/Pubs/girthpvp96t.pdf

Here's an article on a full scale burst test on  large diameter X 100 Gas line pipe:

http://www.bergpipe.com/files/ep_tp_35_00_en.pdf

Well, that's about all I've got for now, so enjoy the rest of the readings and take a good look at the article from Walter Sperko of Sperko Engineering! ;)

Respectfully,
Henry
Parent - - By 3.2 Inspector (***) Date 10-28-2009 14:58
Henry,
I think you accidently added an "L" at the end of the link....

http://www.sperkoengineering.com/html/articles/How%20good%20do%20Welds_.pdf   is the working link.

3.2
Parent - By ssbn727 (*****) Date 10-28-2009 15:57 Edited 11-03-2009 22:19
Hey 3.2 inspector!

I guess somehow I was in a rush to do something else and that was included as you mentioned...

Henry
Up Topic Welding Industry / Technical Discussions / Hoop Stress

Powered by mwForum 2.29.2 © 1999-2013 Markus Wichitill