pipingdesign: Re: Anchor Block Requirement

From: <Tony>
Date: Wed Oct 02 2002 - 20:54:00 EDT

Geoff,
My comments concerned buried steel or GRE pipelines for water, natural gas, or other hydrocarbon services that are coated for corrosion protection. There have been numerous installations in Canada and Holland where foam or peat crushing has been employed successfully. Typically the low stiffness material is placed along the pipe (and around the bend) for some number of meters on either side of the bend to reduce the stress in the lateral bearing length of pipe. Dow makes six different grades of the material to accomodate various conditions.

Insulated, buried pipe certainly provides a different set of problems. I presumed from Saeed's comments that the pipeline he was asking about was not of the insulated variety. Tony

Original Message ----- From: "Geoff Stone DD&D Australia" <blenrayaust@yahoo.co.uk> To: <PipingDesign@yahoogroups.com> Sent: Wednesday, October 02, 2002 3:02 PM Subject: Re: [PipingDesign] Anchor Block Requirement

> Tony,
>
> We are in violent agreement on this matter.
>
> Could you comment on a matter posted recently on pre insulated pipe where
the
> skin friction holds the outer shaeth in place and the inner pipe expands
and
> contracts. Do you have any experience in the foam shearing or crushing at
> changes of direction. The system suppliers believe that there isnt a
problem
> but they perhaps havent dug any up after years of service. Can you believe
that
> the foam has sufficient shear strength as to restrain the inner pipe from
> moving?
>
> Geoff Stone
> --- Tony Paulin <tony@paulin.com> wrote:
>
> <HR>
> <html><body>
>
>
> <tt>
> Thrust Blocks on Underground Piping: 
> 
> There are two types of pressurized underground piping systems, those 
> that support axial tension and those that do not. Bell and spigot type 
> end connections do not support axial stress in the pipe and so the end 
> thrust (P times A) must be carried by the soil via an anchor block or 
> the pipe joint will separate. 
> 
> When a buried pipe is circumferentially welded at each joint such 
> restraint is not needed unless the axial thermal or pressure
expansions 
> produce excessive stresses or displacements, usually however, the 
> solution is to permit the expansion, not try to restrain it. 
> 
> Anchor blocks on circumferentially welded pipe can be placed to: 
> 
>     1) Reduce the stress if the displacement cannot be 
>         absorbed or tolerated.  In
> Holland peat is used in 
>         the area around buried bends to
> soften the backfill 
>         and permit displacement. Dow
also
> makes a polystyrene 
>         product in several grades that
can
> be used to perform 
>         the same function. Permitting
the
> displacement is usually 
>         the solution in these case. 
>     2) Stop displacements in areas where transitions to 
>         above ground pipe, or where
tie-ins
> or other 
>         connections exist that cannot
> tolerate the movement. 
>     3) Where large waterhammer loads are expected to 
>         prevent excessive pipe
movement. 
> 
> There are other special conditions, but I don't get the feeling 
> that these cases are being discussed. 
> 
> 
> ----- Original Message ----- 
> From: "saeed ahmed" <n2701h@yahoo.com> 
> To: <PipingDesign@yahoogroups.com> 
> Sent: Wednesday, October 02, 2002 11:01 AM 
> Subject: RE: [PipingDesign] Anchor Block Requirement 
> 
> 
> > 
> > Actually there is a caculation which gives us the requirement of
> thrust 
> block for underground piping at bend. Such bends can be 90 deg or less
than 
> 90 degree in underground piping. 
> > Saeed. 
> >  Geoff Stone DD&D Australia wrote:Saeed, 
> > 
> > Why do think you need a thrust block? 
> > 
> > Geoff Stone 
> > --- saeed ahmed wrote: 
> > 
> > 
> > --------------------------------- 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > Thanks Geoff Stone for the reply. 
> > 
> > 
> > 
> > Iam talking about thrust block requirement in underground piping at
> bend. 
> > 
> > 
> > 
> > Saeed. 
> > 
> > 
> > 
> > 
> > 
> > Steve McKenzie wrote:Hi Geoff 
> > 
> > 
> > 
> > I use them on steel lines where water hammer is an issue. 
> > 
> > 
> > 
> > Cheers 
> > 
> > 
> > 
> > Steve McKenzie 
> > 
> > 
> > 
> > -----Original Message----- 
> > 
> > From: Geoff Stone DD&D Australia
[mailto:blenrayaust@yahoo.co.uk] 
> > 
> > Sent: Monday, September 30, 2002 9:37 AM 
> > 
> > To: PipingDesign@yahoogroups.com 
> > 
> > Subject: Re: [PipingDesign] Anchor Block Requirement 
> > 
> > 
> > 
> > 
> > 
> > Saeed, 
> > 
> > 
> > 
> > Please provide more details as it is difficult to understand why you
> are 
> > 
> > considering an anchor block for underground piping that is
welded? 
> > 
> > Anchor blocks are sued for rubeer ring jointed ssytems such as
ductile 
> iron 
> > 
> > and 
> > 
> > thermoplastics but not a welded steel pipe. 
> > 
> > 
> > 
> > Geoff Stone 
> > 
> > --- n2701h wrote: 
> > 
> > 
> > 
> > 
> > 
> > --------------------------------- 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > In calculating the anchor block requirement at  underground 
> > 
> > piping 
> > 
> > 
> > 
> > 
> > 
> > bend,there are two variable involved ,one is tie-in temperature
and 
> > 
> > 
> > 
> > the other is allowable piping deflection.What should be the
critaria 
> > 
> > 
> > 
> > taken in the calculation? 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > With thanks 
> > 
> > 
> > 
> > Saeed 
> > 
> > 
> > 
> > n2701h@yahoo.com 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > Texas Flange - a good source for information on industrial flanges,
> all 
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> > 
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> > 
> > 
> > 
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> > Design Detail and Development (a division of Blenray Pty Ltd) 
> > We specialise in pipe network and waterhammer analysis, pipe
stress 
> analysis, the design of buried pipelines and thermoplastic pipe
systems. 
> > Local tel 0402 35 2313 fax 02 8850 2313 
> > Overseas tel 61 402 35 2313 fax 61 2 8850 2313 
> > Mail Address PO Box 1351 Castle Hill NSW 1765 Australia 
> > 
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> all 
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> =====
> Design Detail and Development (a division of Blenray Pty Ltd)
> We specialise in pipe network and waterhammer analysis, pipe stress
analysis, the design of buried pipelines and thermoplastic pipe systems.
> Local tel 0402 35 2313 fax 02 8850 2313
> Overseas tel 61 402 35 2313 fax 61 2 8850 2313
> Mail Address PO Box 1351 Castle Hill NSW 1765 Australia
>
> __________________________________________________
> Do you Yahoo!?
> New DSL Internet Access from SBC & Yahoo!
> http://sbc.yahoo.com
>
>
> 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
> =====================================================
> unsubscribe: PipingDesign-unsubscribe@yahoogroups.com
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Received on Wed Oct 02 20:54:00 2002

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