On Jan 4, 2008, at 1:27 AM, Richard Beale wrote:
> For example, let's say that we have to connect NPS 4 sch 80 BW and
> NPS 4 sch 40 BW fittings or pipe. A piece of NPS 4 sch 80 is cut
> and taperbored at one end to sch 40.
In this particular case Section VIII Div 1 mandates a taper of 3:1.
It's made to avoid high peak stress.
Out of curiosity I did a Google search on 'transition piece' AND piping and got 4700 hits, more or less. Turns out there are lot of things called transition pieces. Some are reducers going from one diameter to another and others for attaching a run of round ducting to a run of rectangular duct work. Some transitions are for structural purposes like the 3:1 taper, but most of the hits I got seemed to address transitions that attempt to reduce flow restriction. Here's a cool example of FEA applied to a transition <http://www.pipingtech.com/technical/tech6/fea.htm>
Maybe the original questioner would favor us with an actual explanation of what he's talking about.
Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=HIVhzBwsZRBGTmnrE-ev2dr941upgBUFXixwL9nDwnePBSgr2JZ-Srgd_WjsF785gc_4wkPT8iz-uda5">chrisw@skypoint.com</a> | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania1864)
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