Re: Flange Leakage

> Kammprofile has no coating and no thin sheet of metal. Baiscally
its a sold piece of metal ring with serrated finish on both sides and covered with graphite ribbon. Flexitallic makes one but i prefer the one in Germany.

The finish for ASME large dia flanges are not smooth but rather phono with 125 RMS finish. Suggest, you run a calc for the Weld Neck to determine loading. If everything has been confirm, ensure that flange surface finish and fit up is Ok. if not OK, reface and correct fitup. Repalce bolts and tightened using multiple stud tensioner.

> --- In PipingDesign@y..., "Ben Nottingham" <bnottingham@c...> wrote:
> > At 740C/1364F, the gasket's coating has probably burned away,
> leaving just
> > the thin corrugated (grooved) sheet of metal. Smooth face finish
> also can
> > be cause of gasket not retaining good contact.
> >
> > Spiral wound would not be suitable due to exceeding available
filler
> > material temperature limit, and might not be acceptable with
flange
> design.
> >
> > Taper-Lok has a sure-fire design for revising most any flange
face
> to accept
> > a tapered solid metal gasket. However, field revision might be a
> problem.
> >
> >
> > Ben
> >
> > -----Original Message-----
> > From: RaviRaj_Rastogi@r... [mailto:RaviRaj_Rastogi@r...]
> > Sent: Wednesday, May 15, 2002 9:46 AM
> > To: PipingDesign@y...
> > Subject: [PipingDesign] Flange Leakage
> >
> >
> >
> >
> > For Flue Gas Expander ( FCCU ) which operates at a high
temperature
> of 740
> > Deg C , line size 72" and pressure of 3.5 bar, we are
facing
> problem
> > of Flange leakage.
> >
> > The Leakage is not continuous but is intermittent during
continuous
> > operations. We have gone ahead with changing the gaskets to
> > Camprofile (Flanges are Weld
> >
> > Neck RF, smth finish 300 # rating, SS grade 321), tightening of
> bolts,
> > analysis results of flange leakage check etc (found ok).,
but
> problem
> > still persists. Request the
> >
> > forum to pour in with valuable suggestions for mitigating the
> problem and
> > finding the root cause.
> >
> >
> >
> > Thanks.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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> >
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Received on Wed Mar 26 13:48:00 2003