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ask112233
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Join Date: Oct 2009
Posts: 27

Where did ASME VIII div1 got its wall thickness theory from?

01/09/2010 12:31 PM

Hi all, just wanted to understand how ASME VIII arrive at the wall thickness equation for circumferential stress in UG-27 from?

I believe it is from the thin cyclinder theory, hoop stress = Pd/2t, i tried to back track on the equation from ASME, but i arrive at a equation like hoop stress = Pd/2Et + 3P/5E; so i just wanted to know if anyone here knows how was the equation in asme derived from?

Thanks.
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bhrescobar
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#1

Re: Where did ASME VIII div1 got its wall thickness theory from?

01/09/2010 2:29 PM

I really think it was from the thin cylinder theory. However, it will not reflect it directly, because in the standard there is always some room to accomodate errors in manufacture, out-of-roundness, surface corrosion allowance, and, more recently in some standards, failure mode behavior. After all... relax. Standards are there to be used in your defense.

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ferquiza
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#2

Re: Where did ASME VIII div1 got its wall thickness theory from?

01/10/2010 2:10 AM

I believe all these formulas becomes the same than "Laplace formulas for bubbles".-
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Abdel Halim Galala
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#3

Re: Where did ASME VIII div1 got its wall thickness theory from?

01/10/2010 3:48 AM

See the following derivation of main equation: ASME_UG-27,_UG-32_&_Appendix_1, after which there is an empirical formula depends on the used code.

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