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We have worked it out through our AI. Under App-24 we are treating the flange facing as a hub due to the clamp taking the stress vs. bolts integral to a std bolted flange.

Before you get to far - if the weldneck flange is of the bolted type connection - then App 2-2(a) gets you back to UG-14 which disallows the use of bar for flanges. UG-14(b) was just added in the 2005 Addenda to clarify per Code Case 2148, the use of bar for Nozzles.

Also you should read UG4 through UG14. Pay attention especially to UG14.

The specification for the materials are probably SA-105 for Carbon Steel & SA-182 for Stainless

As I suspected, no one likes this post. I wish we were through with it. Hopefully I will have answers from our AI.

Thanks guys! Our AI has answered my request and today called saying he is mailing it.

I've checked the ASME internet site. All I got there was the Title "Use of Rod and Bar for Nozzle Necks". Where do code cases go? Why doesn't the code document them? I find interpretations with some secondary reference to this code case.

Our AI is questioning our use of SA479 Tri-Clamp Ferrules in code vessels. He sighted code case 2148, which as far as I can tell deals only w/Nozzle Necks. Anybody having some insight, I would deeply appreciate the help. BradSr