Re: regular bore valves

Another factor to consider is line "pigging". Full bore valving is what I have always specified for this application. Also when considering complete line drainage without purging or even with, a full bore is the way to go. A reduced bore could form a dam in the line, retaining some residue. You can also retain a fraction of residue in a full bore gate valve - in the recessed seat for the wedge. For complete cleanness you cann't beat a full bore ball valve.

• Original Message ----- From: Paul Bowers <pbowers@pipingdesign.com> To: <PipingDesign@yahoogroups.com> Sent: Wednesday, June 06, 2001 9:33 PM Subject: Re: [PipingDesign] regular bore valves

> You would also want a full-bore valve to minimize potential
> entrapment of contaminants (say, HC in O2 flow) and for flows that
> contain solids (for example, pulp or other semi-solids). Both
> full-bore flow options would reduce downtime between
> cleaning/purge-derime.
>
> But then, I'm not a valve expert.
>
> Paul
>
>
> > In the regular bore 12" gate valve, the actual diameter of the
> valve will be
> > smaller than 12 ", and thus there will be a higher pressure drop
> at full
> > open condition as compared to a full bore 12" gate valve, where
> the ID of
> > the valve is same as the inlet sizing, and there will be very
> small pressure
> > drop. Generally used for overhead vapour vent lines (e.g.
> Recovery of
> > vapours from a crude storage tank) where even a small pressure
> drop is
> > critical.
> >
> > Varun Pant
>
>
> > Hello everybody,
> >
> > Can anybody tell me the difference between a regular
> > bore 12" gate valve and full bore 12" gate valve.
>
>
>
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Received on Thu Jun 07 14:43:00 2001