Hi Jaswinder,
Yes this is what is mean.
Imagine this:
A pump with a 300NB outlet discharging into a rubber hose at 10 bar. The
hose is flexible and anchored at a remote point. The pressure at the pump
nozzle will result in a reaction of about 70kN or 7 tonnes. The rubber hose
will not resist the reaction so the pump and foundations must.
Now if we replace the rubber hose with a rigid steel pipe, the reaction can
be absorbed by the pipe going into tension. We do not need foundations to
resist the thrust load (in a perfect world). However the tension load will
also be applied to the pump nozzle. In the case under discussion, this
tension load is greater than the pump can carry. Therefore it must be
resisted by the pump foundations. This is Newtons third law in action.
Hope I've got it right. If I havent, I'm sure someone will take pleasure in
correcting me.
Cheers
Steve
>
> Hi Steve !
>
> Do you mean that entire thrust force is being taken by pump foundation !!
>
> Jaswinder
>
>
>
>
> "Steve McKenzie" <Mechproj@xtra.co.nz> on 04/11/2002 04:56:16 PM
>
> Please respond to <a href="/group/PipingDesign/post?postID=F1XOGSjcRZrbO2ChcZu3Rqr-qtZOF4Ux84BSyeiRPE-aa_HLXJjZVfJYwpeF6A2oJYfXWYuMzjPDrHRnL6OUAV1g">PipingDesign@yahoogroups.com</a>
>
> To: <PipingDesign@yahoogroups.com>
> cc:
> Subject: Re: Re: [PipingDesign] Expansion trust force effect to pump
> nozzle.
>
>
> Hi Pat
> the pump must see the thrust load or else it cannot deliver. The sole
> purpose of a pump is to increase pressure. By doing this it suffers the
> indignity of being pushed backwards. In order to resist this, the pump
must
> be restrained. This is why we design pump foundations. Sometimes they are
> large.Over to you.
>
> Cheers
>
> Steve McKenzie
> ----- Original Message -----
> From: "Pat Burg" <patburgh2001@yahoo.com>
> To: <pipingdesign@yahoogroups.com>
> Sent: Thursday, April 11, 2002 7:32 AM
> Subject: Fwd: Re: [PipingDesign] Expansion trust force effect to pump
> nozzle.
>
>
> > --- Tony Paulin <tony@paulin.com> wrote:
> > > From: "Tony Paulin" <tony@paulin.com>
> > > To: "Pat Burg" <patburgh2001@yahoo.com>
> > > Subject: Re: [PipingDesign] Expansion trust force
> > > effect to pump nozzle.
> > > Date: Wed, 10 Apr 2002 13:36:26 -0700
> > >
> > > Pat,
> > > The tie bars are supposed to carry the thrust load,
> > > not the pump. Elastomeric joints are generally
> > > avoided
> > > if possible in critical piping systems. Temperature
> > > changes,
> > > property variations, etc. can produce a system that
> > > is
> > > susceptible to pressure pulsations, mishandling,
> > > etc.
> > > (Whereas steel systems and joints are not so
> > > susceptible.)
> > >
> > > The joint is designed to take horizontal movement,
> > > not axial. If the loads are too high then a
> > > reconfiguration
> > > of the piping is needed, or a more accurate model of
> > >
> > > the thermal or load case.
> > >
> > > These situations are somewhat tricky, and someone
> > > used to modeling nuances of the program and of the
> > > installation can usually help out. This might be a
> > > problem to have a "consultant" look at to be sure
> > > that the modeling and loads are accurate.
> > >
> > > Tony
> >
> >
> >
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Received on Thu Apr 11 18:04:00 2002
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