Hi Barbara
Kellogg "Design of Piping Systems", 1956, p82 states:
" Marks [12] has fatigue tested smoothly contoured commercial reducers and
finds a stress intensification factor of unity justified".
ASME B31.1 (table D-1) gives the stress intensification factor as a formula
dependent in part on the cone angle (along with other conditions), up to a
maximum of 2.
If the service is non critical, I would work on a factor of 2. If critical,
or if the use of 2 mucks up the design, I would keep looking.
The approximation of a commercial reducer to a cone is probably not a good
one because the commercial reducer knuckle radii will add flexibility not
accounted for in a cone approximation.
Cheers
Steve McKenzie
-----Original Message-----
From: Geoff Stone DD&D Australia [mailto:blenrayaust@yahoo.co.uk]
Sent: Wednesday, August 21, 2002 9:29 AM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Dimensions of concentric reducers to ASME
B16.9
James,
Have you tried a Tube Turns manual? You may find that there is no specific
dimensions and that they varty from manufacturer to manufacturer. I would
try
the manufacturer in the first instance.
--- "James, Barbara" <bjames@mitsuibabcock.com> wrote:
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<tt>
I am looking for a resource that will give me information on the<BR>
detailed dimensions of concentric reducers to ASME B16.9<BR>
<BR>
As part of an ASME III NB pipe stress analysis, details of the reducers<BR>
are needed; specifically the length of the straight section at either<BR>
end and the cone angle. <BR>
<BR>
This info isn't in the code, does anybody know where I might find it?<BR>
<BR>
Best regards<BR>
<BR>
Barbara James<BR>
<BR>
<BR>
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Texas Flange - a good source for information on industrial flanges, all they
ask is for referrals for designs they help with.<BR>
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Texas Flange - a good source for information on industrial flanges, all they
ask is for referrals for designs they help with.
877-610-8924.
www.texasflange.com
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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