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
> 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
>
>
>
>
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Received on Fri May 09 08:52:00 2003
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