Interested..
"tomcruz55" <tomcruz55@yahoo.com>
27/03/2003 04:39
Please respond to PipingDesign
To: PipingDesign@yahoogroups.com
cc:
Subject: [PipingDesign] Re: Trunnion on an Elbow
I have to disagree with comments made by Zope and Sachin. Trunnion is
pretty much an industry accepted pipe support. As pointed out, even
the guys at Kellogs ( avery long time ago) have done quite a detailed
study on this very subject and recommend its use. The last book that
ive read published by CASTI even has a an equation that deals
specifically with its proper design. There are over a thousand of
this type of pipe support installed in power plant, refinery and
petrochem that to date is still around.
And forget about the effect of the SIF, it rarely affect the result
of your flexibility analysis. Instead focus on the details - welding,
inspection and fitup if your designing one. If anyone is interested,
i could post the equation for its design.
- In PipingDesign@yahoogroups.com, "Tushar, Zope"
<zope_tushar@f...> wrote:
> Hello Friends,
>
> Use of trunion on elbow is generally accepted practice. Some
companies do not allow at all and some companies do allow on
conditional basis.
>
> You can use it for temp. below 150 deg C (No problem at all.)
> But it's not good to use it above 150 deg C. The reason is simple
that we can take advantage of flexibility associated with the elbow
in stress analysis.
> Also I would suggest to avoid it above 60 deg C for Stainless Steel
and Alloy Steel lines.
>
> Better go for a support at the pipe (horizontal or vertical as
well).
>
> Thanks and regards.
>
> Tushar Zope
> Piping Engineer
> Foster Wheeler Eastern Pte. Ltd, Singapore
> Ph: 6890 0837 Fax: 6223 2989
>
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> ____________________Reply Separator____________________
> Subject: Re: [PipingDesign] Trunnion on an Elbow
> Author: Sachin_Bapat@r...
> Date: 9/7/02 8:46 AM
>
>
>
>
> If you go through piping design books you will find that
> trunnion on elbow
> reduces the flexiblity of trunnion & also it modifies the
value
> of sif &
> flexibility factor . piping design book (M W kellogg)
chapter 4
> -local
> components expilicitly derives relation for the same, thats
> why most of
> design companies dont prefer trunnion on elbows & use of pads
> for trunnion
> on elbow is highly discarded as all these reduce flexibility
of
> trunnion ,
> which may be of concern in rigid layouts
> hope this answers your query.
> regards
> sachin
>
>
>
>
>
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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
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Received on Wed Mar 26 16:49:00 2003