RE: Modeling Hygienic Unions

>My apologies, my initial posting was not sufficiently clear.
No problem. Are you talking about clamps like the Grayloc or Tri-Clover variety?

>The question is one of
>applying the unions and demonstrating compliance with the code.
I think the easy for doing this is to show that your clamp meets the code rules for a pressure which produces a unit axial load equal to the (calculated axial pressure stress + the calculated bending stress)/pipe wall thickness. This is fairly conservative, but it'll meet the U-2(g) requirements without a lot a extra work.

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw@skypoint.com        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)