pipingdesign: Re: Re: Trunnion on an Elbow

From: <Geoff>
Date: Sun Nov 17 2002 - 15:26:00 EST

Tushar,

It depends upon the the detail of the trunnion mount. If the mounting bracket is small in respect of the elbow I dont see why you cant take this approach. After all the pipe support industry shows this type of support. If you are right on the limit of stress at the elbow you may want to use FEA to look at the stresses.

Geoff
--- zope_tushar@fwc.com wrote:

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Geoff Stone, 
 

Do u mean that elbow with trunion and without trunion will show same behaviour in the thermal case?? I mean will they absorb the same displacement?? 
 

Tushar 
 
 
 
 

PipingDesign@yahoogroups.com AT SMTP Sent by: Geoff Stone DD&D Australia <blenrayaust@yahoo.co.uk> AT SMTP 
11/15/02 01:00 PM 
 

 
        To:     PipingDesign@yahoogroups.com AT SMTP@ccMTA-sgsinmx001         cc:     (bcc: Zope Tushar/fwsg) 
        Subject:        Re: [PipingDesign] Re: Trunnion on an Elbow 
 
 
 
 

The trunnion detail that you are referring to is usually a thin plate welded to 
the back of the elbow over a relatively small section of the outside radius. 
 

Thinking about it, when the elbow is strained in plane or out of plane the SIF 
wouldnt be changed drammatically. In-plane the elbow will be changed from 
circular to elliptical and out of plane the elbow will rotate because the 
trunnion plate is relatively thin and will deflect. Any comments? --- mechengr1977 <mechengr1977@yahoo.com> wrote: 
 

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<tt> 
the use of trunnion welded to the elbow is a common practice in 
refinery, power plant and petrochem. Charts has been develop by 
engineering/contruction firms such as Flour Daniel and Bechtel to 
aid in its sizing/selection. This SIF business is getting out of 
hands. 
 
--- In PipingDesign@y..., &quot;KAUSTUBH JOSHI&quot; &lt;kvj@e...&gt; 
wrote:

&amp;gt; Dear Shreedhar,&lt;BR&gt;<BR>
&amp;gt; &lt;BR&gt;<BR>
&amp;gt; When a trunnion is welded onto the bend, the bend looses<BR>

the 
flexibility. So in actual case, the flexibility factor associated 
with the bend will reduce.

&amp;gt; &lt;BR&gt;<BR>
&amp;gt; You should try to put supports away from bend to use the<BR>
&lt;BR&gt;<BR>

flexibility of the bend.

&amp;gt; &lt;BR&gt;<BR>
&amp;gt; Regards,&lt;BR&gt;<BR>
&amp;gt; Kaustubh&lt;BR&gt;<BR>
&lt;BR&gt;<BR>
&lt;/tt&gt;<BR>

 
 

 
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Discussion List sponsor: 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

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Design Detail and Development (a division of Blenray Pty Ltd) We specialise in pipe network and waterhammer analysis, pipe stress analysis, the design of buried pipelines and thermoplastic pipe systems. Local tel 0402 35 2313 fax 02 8850 2313
Overseas tel 61 402 35 2313 fax 61 2 8850 2313 Mail Address PO Box 1351 Castle Hill NSW 1765 Australia

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Yahoo! Web Hosting - Let the expert host your site http://webhosting.yahoo.com Received on Sun Nov 17 15:26:00 2002

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