You are correct. The impervious nature of foamglas makes it ideal for
flanged joint, instrument connections - anything that could be a source of
leakage, particularly on media that can accummulate in porous insulation and
cause a flash problem. We use it for that also. But it also serves as an
ideal insulation on S/S, that resides within the SCC range, as an
nonabsorbent material, thus helping ward off water/cloride retention on the
pipe wall.
>
>
> My experience has been that foamglass is primarily used for services where
if a
> fluid leaks spontaneous combustion would occur. many years ago I used
foamglass
> where on heat transfer fluid lines. The client was concerned that if the
> material leaked into a fibre material then the increase in surface area
afforded
> by the fibres would accelerate flashing. Some experience in the USA had
pin
> pointed this as the cause of a fire.
>
> Foamed polyurethane insulation that is factory applied will create a
natural
> vapour barrier as it adheres to the surface of the pipe. then one only has
to
> worry about the joints and the vapour seal.
>
> Of course you have to worry about a vapour seal at 100C. When the line is
> shutdown the vapour condenses and accelerates corrosion.
>
> I dont know what specifically you mean by a nomex garment. In the LPG
compressor
> stations I have worked on th eoperators and fitters were required to were
> boilersuits that did not cause a spark by generating static.
>
>
>
>
> "SARE, RALPH H." <SARERH@YANPET.SABIC.com> on 27/06/2001 19:38:40
>
> Please respond to <a href="/group/PipingDesign/post?postID=G_-g-cjVQ7YUK9RAmandHQc5z7IqxXSIyIjuBKJ4fJSGEKMhn4tdjfQ4TmYPWWenjWIj6AexxT2vl-WvKYt-b5L7VIu8">PipingDesign@yahoogroups.com</a>
>
> To: "'PipingDesign@yahoogroups.com'" <PipingDesign@yahoogroups.com>
> cc:
>
> Subject: RE: [PipingDesign] CUI Part 2
>
>
> Right. We have replace a lot of our insulation both for cold and hot
service
> with foamglass
> ----------
>
>
> but mostly for tanks, columsn and vessels. We're still
> partial to mineral wool (pre-fromed) for piping but only for hot service.
> Ever heard of insulation "punking"?
>
> This leads me to the other question. Do we need to apply a primer on an
> insulated pipe spool for hot service (above 100degC)?
>
> Everett - since u work in a chemical indusrty, do u require your crafts to
> wear a nomex garments while working inside the plant (or in the workshop)
> say to break a flange, do some welding or say performing a hydro jetting?
(i
> dont know if its mandatory under the osha rules in the us of a) Does it
also
> apply to outside contractor?
>
> > ----------
> > From: EVERETT W. NICHOLS[SMTP:enichols@bbtel.com]
> > Reply To: <a href="/group/PipingDesign/post?postID=G_-g-cjVQ7YUK9RAmandHQc5z7IqxXSIyIjuBKJ4fJSGEKMhn4tdjfQ4TmYPWWenjWIj6AexxT2vl-WvKYt-b5L7VIu8">PipingDesign@yahoogroups.com</a>
> > Sent: 26 June, 2001 7:51 PM
> > To: <a href="/group/PipingDesign/post?postID=G_-g-cjVQ7YUK9RAmandHQc5z7IqxXSIyIjuBKJ4fJSGEKMhn4tdjfQ4TmYPWWenjWIj6AexxT2vl-WvKYt-b5L7VIu8">PipingDesign@yahoogroups.com</a>
> > Subject: Re: [PipingDesign] CUI Part 2
> >
> > Coming from the chemical processing industry, I have seen some effects
of
> > SCC. One of the best ways to ward this off is to use a closed cell
> > insulation - such as foamglas. We have found this material to perform
very
> > well even at high temperatures 600 degree plus. The hi-temp foam glass
is
> > expensive but in some situations is worth the cost. The impervious
nature
> > of
> > foamglas makes it ideal. You do got to make sure to seal all the joints
> > very
> > well with cloride free mastic. Another approach is to apply a coating on
> > the
> > S/S such as: silicone type epoxy amine paint.
> >
> > ----- Original Message -----
> > From: SARE, RALPH H. <SARERH@YANPET.SABIC.com>
> > To: <PipingDesign@yahoogroups.com>
> > Sent: Monday, June 25, 2001 4:51 AM
> > Subject: [PipingDesign] CUI Part 2
> >
> >
> > > The following was taken from ASTM STP 880 by Pollock and Barnhart.
> > >
> > >
> > > Very serious corrosion problems can occur to plant equipment and
piping
> > > components that are thermally insulated if the insulation becomes wet.
> > > On carbon steels, the corrosion is usually of genral or pitting type.
On
> > > stainless steels, the corrosiion is almost always SCC.. The isnualtion
> > > usually hides the corrosidng metal and the problem can go undetedcted
> > for
> > > years u ntil metal failure occurs.
> > >
> > > To complicate the problem, the degree of corrosion when insulation
gets
> > wet
> > > is dependendt on the type of insulation. Inspection for the problem is
> > also
> > > difficult Determning the the metal has corroded under the insualtion
is
> > not
> > > widely available.
> > >
> > > The STP also touches on the subject related to SCC and the effect of
> > service
> > > temp. Here are some.
> > >
> > > Service TEmp is important in CUI for 2 reasons
> > > 1. higher temp allows water to be present againts the steel for less
> > time
> > > 2. higher temp make the water more corrosive, and paints and caulking
> > fail
> > > sooner.
> > > generally, equipment that operates below freezing is protected againts
> > > corrosion. Howveer, attachment to the equipment which are not as cold
> > are
> > > vulnerable in the transiiton out of the vapor barririer into warm
humid
> > air.
> > > Cororsion associated with equipment below freezing temp is corrosion
> > outside
> > > of, not under insulation
> > >
> > > Corrosion under warm inuslation is equally difficult to manage due to
> > dry
> > > out of entering water. Summary of the study showed that:
> > > 1. temp range of 60 and 80C appears to account for the gretaest amount
> > of
> > > damage.
> > > 2. on very warm equipment even with small weatherporffoing defects,
> > > coorosion tends to be at the oint of entry of water.
> > > 3. annual corrosion rate amy exceed 1.5 mm per year.
> > >
> > > Guys, the problem is real and will cost a lot of dollars to detect and
> > > repair. The report further stated that there are seven contributing
> > factors
> > > to CUI. Top on the list is, now hear this, "equipment design".
> > >
> > >
> > >
> > >
> > > _____________________
> > > Piping Design Central
> > > [ http://www.PipingDesign.com ]
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Received on Thu Jun 28 14:10:00 2001
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