ASME VIII-1 Appendix 2 Flange Stresses

[georgacus]

What exactly are meant by tangential stresses in the context of Appendix 2. I've just done some calculations but I'm trying to understand what direction these stresses act in. Are these the forces caused by the inward bending of the flange due to the bolt load?

 

[BenStewart]

I assume you're referring to the tangential flange stress S[sub]T[/sub] in Mandatory Appendix 2 of ASME VIII-1?

If so, check the definition of moment M[sub]o[/sub] in 2-3 and 2-6. Also, Figure 2-4 shows you the forces and lever arms that are considered when calculating M[sub]o[/sub]...and then S[sub]T[/sub].

Note these calculations are design calculations only and not stress analysis calculations.

 

[Masters2788]

BenStewart,

Can you explain further what you mean by "Note these calculations are design calculations only and not stress analysis calculations."?

Thanks.

 

[TGS4]

Masters2788 - search through the archives of this forum, and read lots of technical papers on the subject. BenStewart's quotation is exactly correct.

Search and ye shall find...

 

[Masters2788]

Thanks for the information TGS4... sorry I did not look first.

 

[georgacus]

BenStewart - Thanks for that, I'll take a look.

 

[Mfakhfekh]

Look in the document ASME PTB-4-13. It provides very good explanations to Code rules with some corrected exercises. (see exercise 4.16)

 

[XL83NL]

Look in the document ASME PTB-4-13.

You mean ASME PTB-4-2013, chapter 4.16?

 

[MikeG7]

Prex explained it nicely to me

When you try to have a ring rotate about its circumferential center line, half of the section goes towards outside and the other half towards inside. The part that displaces towards outside undergoes an elongation and thus tension stresses, the opposite of course the other half. So the section is under bending and displays tangential stresses.
prex

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