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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<tt>
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
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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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<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>
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