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Sect VIII, Div1, UHX 13, Sy @ T & Sect II-D, Table Y-1

Sect VIII, Div1, UHX 13, Sy @ T & Sect II-D, Table Y-1

Sect VIII, Div1, UHX 13, Sy @ T & Sect II-D, Table Y-1

(OP)
Section VIII, Div 1, UHX 13.3 Nomenclature states for yield stresses:

"NOTE: The yield strength shall be taken from Table Y-1 in Section II, Part D. When a yield strength value is not listed in Table Y-1, one may be obtained by using the procedure in Step UG-28(c)(2)3."

Could someone please explain how UG-28 is applicable? If it is not plainly applicable, and the Code is only using this Step in UG-28 as a methodology, could someone please explain what result is the yield one is to use from said method? Is the result of Pa2 the yield you're supposed to use? Is the methodology to continue to find B as in UG-28(c)(2)3(a) and -(b)? If so, what does Pa2 have to do with it? Unless one is to continue to Step 4? If that is the case, why doesn't UHX say so, and why start with Step 3 and not Step 1? This redirection is very vague.

Cryptic instructions like this in the Code leave me baffled. I tend to overthink things, but when instructions lead you to parts of the Code that clearly aren't applicable in a physical sense, and then aren't clear how far to take the redirection, it becomes almost impossible to be confident in your interpretation. (end rant)

How do you handle this situation?

--------------------------------
Fitter, happier, more productive

RE: Sect VIII, Div1, UHX 13, Sy @ T & Sect II-D, Table Y-1

BigTank, I interpret that the procedure is to follow UG-28(c)(2) Step 3 (a) & (b) only. UG-28(c)(2)(a) gets you to a value for B from a given temp curve. Then yield is calculated as 2 times B. Note the sentence preceeding UG-28(c)(2)(a). "Values of yield strength...."

Pa1, Pa2, Step 4 etc, etc are not used.

Regards,

Mike

RE: Sect VIII, Div1, UHX 13, Sy @ T & Sect II-D, Table Y-1

(OP)
Thanks, SnT. That's how I see it as well. My confusion is: if that's the intention of the Code, why didn't they just say it? I'm suffering similar disconnection with popular interpretation re: UW-12 long. seam (circ. stress) joint efficiency...the Code implies, but leaves very large gaps in engineering judgement...leading people to the economical decision (compromise). But I digress...

--------------------------------
Fitter, happier, more productive

RE: Sect VIII, Div1, UHX 13, Sy @ T & Sect II-D, Table Y-1

BigTank, over the years each Ed / Add that comes out cleans up a little language here and there. With the way Part UHX has gone there is no doubt in my mind they will get to it one day :)

Regards,

Mike



















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