You'll have to send that attachment via private email, as the discussion list settings auto-delete attachments.
Paul
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> Steve,
> The attached is from Jamal Jamalyaria from Flexitallic and it is in
> response to your question about gaskets.
> Regards,
> Tony Paulin
>
> From: Jamal Jamalyaria
> Sent: Thursday, May 08, 2003 3:01 PM
> To: 'PipingDesign@yahoogroups.com'
> Cc: 'tony@paulin.com'
> Subject: RE: possible sale of gaskets
>
>
> Steve,
>
> There are two types of gaskets I can suggest:
>
> 1- Sigma 533 if there is not any sulfuric acid involved in slurry,
> otherwise, Sigma 500. Sigma is a reinforced PTFE material.
>
> 2- Special Flexpro gasket, made with serrated stainless steel (or other
> metals depending on the compatibility) metal core, faced with PTFE.
>
> Option 2 is a semi-metallic gasket, and basically is blow out proof.
>
> Regards,
>
> Jamal Jamalyaria
> Product Engineer
>
> ----- Original Message -----
> From: "Steve McKenzie" <Mechproj@xtra.co.nz>
> To: <PipingDesign@yahoogroups.com>
> Sent: Thursday, May 08, 2003 3:15 AM
> Subject: [PipingDesign] New question; blowing out gaskets on PE line; how
to
> stop
>
>
> > Gents
> >
> > Have put in a 250NB (355 OD) PN20 PE slurry line; expected max pressure
> 16
> > bar. Flanged joints are stub flanges, gramophone finish, Table F steel
> > backing rings. Gaskets are 3mm reinforced insertion rubber. Have had a
few
> > blowouts at 10 bar as we are not yet up to full output. Bolts were not
> being
> > tightened properly but I think the problem is more than that.
> >
> > Need a better gasket.
> >
> > Have considered:
> >
> > No gasket; just tighten her up; the slurry solids might blind off any
> minor
> > leaks.
> > CAF gasket. Not my favourite as the CAF is probably too hard for the PE
> > grooves to get a good bite on.
> > Spiral wound or corrugated metal.
> > Metal backing ring to rubber: my favourite but where do you buy them?
> > Metal ring which cuts into the plastic as the joint is tightened.
> >
> > Has anyone had this problem and if so how did they overcome it? No time
> for
> > major work to the flange faces, so the solution must be with the gasket
> > itself.
> >
> >
> > In anticipation
> >
> > Thanks
> >
> > Steve McKenzie
Received on Fri May 09 13:17:00 2003
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