Re: Re: Trunnion on an Elbow

From: <zope_tushar@fwc.com>
Date: Fri Nov 15 2002 - 00:58:00 EST

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:

<HR>
<html><body>

<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>

<BR>
</tt>

<br>
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[Non-text portions of this message have been removed] Received on Fri Nov 15 00:58:00 2002

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