Re: Re: Trunnion on an Elbow

From: <Geoff>
Date: Thu Nov 14 2002 - 23:44:00 EST

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 <BR> refinery, power plant and petrochem. Charts has been develop by <BR> engineering/contruction firms such as Flour Daniel and Bechtel to <BR> aid in its sizing/selection. This SIF business is getting out of <BR> hands.<BR>
<BR>

--- In PipingDesign@y..., &quot;KAUSTUBH JOSHI&quot; &lt;kvj@e...&gt; wrote:<BR> 

&gt; Dear Shreedhar,<BR>
&gt; <BR>
&gt; When a trunnion is welded onto the bend, the bend looses the <BR>
flexibility. So in actual case, the flexibility factor associated <BR> with the bend will reduce.<BR>
&gt; <BR>
&gt; You should try to put supports away from bend to use the <BR> flexibility of the bend.<BR> 
&gt; <BR>
&gt; Regards,<BR>
&gt; Kaustubh<BR>

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