RE: Re: Trunnion on an Elbow

Hi Tom,
Everyone are interested in Calc. Better you post the material on personal ID of Paul (Moderator) and he will just Up-load the material on Group. I think it will be convenient for you and all of also. Regards,

	 -----Original Message-----
	 From: tomcruz55 [SMTP:tomcruz55@yahoo.com]
	 Sent: Thursday, March 27, 2003 12:10 AM
	 To: PipingDesign@yahoogroups.com
	 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

	 >

	 > Disclaimer

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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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