RE: Design of clamp support.

From: <Ratul>
Date: Wed Jun 22 2005 - 13:12:00 EDT

Rajesh,

        The formula which you have mentioned is based on the theory of Beam on Elastic Foundation. Any pressure vessel text book you can refer for the theory. However this formula has been mentioned in Kellog Engineering Handbook also.

Regards
Ratul Barkataki
Petrofac Int. Ltd.

• Rajesh.Balapure@ril.com wrote:

>
> Rajesh V Balapure
> ----- Forwarded by Rajesh V Balapure/JAMNAGAR/RIL on
> 06/20/2005 02:46 PM
> -----
>
>
>
> Rajesh V Balapure
>
>
> To:
> <a href="/group/PipingDesign/post?postID=2o5k74SCtu-ko9Ph9g_dgaRONmN9D8S2l16ho43A3EAZWJ4NgtE1_B3E6jLopI3iYwRefRTzZf0QbuQzXqEscTG6rUY">PipingDesign@yahoogroups.com</a>
>
> 06/20/2005 09:57 cc:
>
>
> AM
> Subject: RE: [PipingDesign] Design of clamp
> support.(Document link: Rajesh V Balapure)
>
> Importance:
> Normal Sender's OU: Reliance |------------------|
>
>
> | [ ] Confidential |
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>
> |------------------|
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> Tanmoy,
>
> I am talking of checking formula for indentation
> because of tightening of
> clamp against thin walled pipes not the whether it
> affects or notother than
> design procedure & normal pressue values,And the
> formulas which I am having
> for calculating bearing stresses & indentation of
> pipe at support pipe are
> listed below .
>
> 1)Bearing stresses at the point of support.
> Sb = 1.1 WL/DB
> where, B=Bearing width (inches)
> D=Bearing length (inches) I am values for
> this pl. let me know
> pipe size.
> W=Weight of pipe (pounds/ft)
> L= Length of span (ft)
> Sb=Allowable code bearing stress
> (pound/inch2)(1.6 times value
> from table A-1/2)
>
> 2) INDENTATION OF PIPE AT SUPPORT POINT
> Stress in the shell of a pipe under local
> loadin.
> S=1.17 F SQ. ROOT (RT) / T 2
> where F=1.1 WL/2(D+B) LOAD/IN. due to radial thrust
> (poun/inch)
> R = radius of pipe(in.)
> T=corroded thickness of pipe (in)
> B=Bearing width (inches)
> D=Bearing length (inches)
> W=Weight of pipe (pounds/ft)
> L= Length of span (ft)
> S = Sh for local loading on shoes. (all
> hot stress 31.3)
> (pound/inch2) & 0.67 Sh for local loading on bare
> pipes.
>
> But I do not know the source /literarture of the
> above formula,
> Can anybody verify this formula & its source?
>
>
> Regards,
> Rajesh Balapure,
>
>
>
>
>
>
>
>
>
>
> Rajesh V Balapure
>
>
>
>
>
> "Saha, Tanmoy"
>
>
> <TSaha@mcdermott. To:
> <PipingDesign@yahoogroups.com>
>
> com> cc:
> (bcc: Rajesh V Balapure/JAMNAGAR/RIL)
>
> Sent by:
> Subject: RE: [PipingDesign] Design of clamp
> support.
>
> PipingDesign@yaho Importance:
> Normal Sender's OU: Reliance |------------------|
>
> ogroups.com
> | [ ] Confidential |
>
>
> |------------------|
>
>
>
>
> 06/20/2005 09:35
>
>
> AM
>
>
> Please respond to
>
>
> PipingDesign
>
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>
> Rajesh
>
> Clamped type shoe supports are used to facilitate
> support installations.
> Very easy to install and very easy to modify lots of
> flexibility. Pipes
> can be hydrotested at much earlier stage as no
> welding in pipe due to
> supports. You did not require waiting for full
> installation of supports
> and all.
>
> Next this clamp pressure will act opposite to the
> line inside pressure.
> Hence do not think it affects pipe thickness
> calculations anyway.
>
> In some countries where it rains too much like
> Holland they prefer
> everything galvanized. In that case this is an
> excellent choice with
> galvanized clamp shoe. Again if pipes are CS and
> other exotic materials,
> CS shoes can be used with proper isolations between
> the clamp and the
> pipe.
>
> Design procedure should be welded shoe type with
> pad.
>
> Tanmoy Saha
> Senior Mechanical Engineer
> McDermott, Dubai
> ++971 4 8043132
>
> -----Original Message-----
> From: <a href="/group/PipingDesign/post?postID=2o5k74SCtu-ko9Ph9g_dgaRONmN9D8S2l16ho43A3EAZWJ4NgtE1_B3E6jLopI3iYwRefRTzZf0QbuQzXqEscTG6rUY">PipingDesign@yahoogroups.com</a>
> [mailto:PipingDesign@yahoogroups.com]
> On Behalf Of <a href="/group/PipingDesign/post?postID=nYrEiq4hbeN2Hx6uXPEfFlHiM-TVGDjkNgQ03XEgJ34HhklIVoXZEz4lzKgpIwhm8G0eRPg0aqK74uxsDx1Qazw">Rajesh.Balapure@ril.com</a>
> Sent: Monday, June 20, 2005 7:45 AM
> To: <a href="/group/PipingDesign/post?postID=WT5vNjsK2SobGb1uDrlig4dBlXHSx_g8dNc8awwSQS90OL8QH83Zou47tPxyK6kg64c-Tj2_ddM6Kfs66U9uzAaSoZU">pipingdesign@yahoogroups.com</a>
> Subject: [PipingDesign] Design of clamp support.
>
>
>
> Dear Piping Design group members,
> If anybody knows ,can you tell me how to get info.
> for following :--->
>
> My Queery is:->
>
> 1) What should be the normal pressure values on the
> pipe surface for
> the
>

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