RE: Piping problem

From: <Ed>
Date: Fri Nov 01 2002 - 08:57:00 EST

Agreed, keep it simple : Provide a swing check valve.......installed horizontally to accept air at system vacuum.

-----Original Message-----
From: Jim Hubbard [mailto:jhubbard@enercon.com] Sent: Friday, November 01, 2002 8:46 AM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Piping problem

A vacuum break or relief will prevent negative pressure during transients such as pump stop. It may not be desired to leave a valve open while piping is under pressure. I do like the idea, keeping design and operation of piping systems simple should be the goal of the design process.

> -----Original Message-----
> From: Tuberias Visa Hermosillo [mailto:amurillo@t-visa.com.mx]
> Sent: Tuesday, October 29, 2002 11:08 AM
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] Piping problem
>
>
> Or just open any valve that will let air in. At the end of the system.
> ----- Original Message -----
> From: "Jim Hubbard" <jhubbard@enercon.com>
> To: <PipingDesign@yahoogroups.com>
> Sent: Tuesday, October 29, 2002 7:05 AM
> Subject: RE: [PipingDesign] Piping problem
>
>
> > use a vacuum relief valve
> >
> > > -----Original Message-----
> > > From: Wilkonet [mailto:wilkonet@yahoo.com]
> > > Sent: Monday, October 28, 2002 11:50 PM
> > > To: PipingDesign@yahoogroups.com
> > > Subject: [PipingDesign] Piping problem
> > >
> > >
> > > Hi Everyone,
> > >
> > > I've recently started my first main job as a trainee mechanical
> > > engineer. One of the first problems ive came across is to modify a
> > > piping system for supply water to a power plant. The material is
> > > hdpe, 450mm dia, 7400m long. The is currently insufficient flow so a
> > > modification is needed. My modification means that the change in
> > > elevation from pump to dam is now -8m instead of previously 8m. (the
> > > pipe would be re ruited)This in theory would give suffiecent flow.
> > > However I have been warned that if the pump is turned off this could
> > > cause a vaccuum to be formed and the pipeline to be crushed.
> > >
> > > I have been searching through the net to try and find some
> > > information on designing pipe systems but have failed to find
> > > anything to give me information on a system which pumps 'down hill'.
> > >
> > > It would be great if anybody could give me some advice or any
> > > information which would halp me in my problem.
> > >
> > > Regards,
> > >
> > > David Wilkinson
> > >
> > >
> > >
> > > 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
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> >
> >
> >
> > 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
> >
> > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> >
> >
>
>
>
>
> 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
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

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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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Fri Nov 01 08:57:00 2002