there was an error before this.
thanks,
manny
--- geoff stone <blenrayaust@yahoo.co.uk> wrote:
> GRP is thermoset plastic resin reinforced with
> fibreglass and lined with a gel coat. The material
> ia
> generally corrosion resistant to most chemicals and
> thus has found a market in the chemical industry. It
> is cost competitive to alloy steel piping but does
> have some design limitations.
>
> The physical properties are anisentropic and thus
> needs additional engineering. The material has a low
> strain tolerance so in buried applications or at
> supports care needs to be taken in assessing the
> local
> buckling criteria.
>
> There are different techniques in laying up the
> reinforcement. Some designs use acriss cross
> roving,
> others a layered wrap and HOBAS uses a sand filled
> resin with random orientated chopped glass strands.
> Each of these techniques affects the physical
> properties.
>
> GRP has been used in service station piping for
> petroleum however I have not heard of its use in
> refineries ither than for effluent treatment plants
> or
> buried watermains.
>
> Some chemical plants may use polypropylene or uPVC
> piping reinforced with fibreglass.
>
> Because pipes are generally laid up on mandrels they
> are in flanged lengths or use a rubber ring jointed
> system. This makes field work more intensive as one
> has to wait for closing lengths or the need for
> thrust
> blocks. Once in the pipe system is not easy to
> modify.
>
> Some problems I have encountered include:-
>
> Collapse in trench conditions
> Delamination of the internal gel coat
> External damage due to impact from tools, rocks etc
> Fire damage
> Long term degradation
>
> Suggest you surf the net , find the suppliers and
> get
> the information from them.
>
> The are standards that cover this material in ASTM,
> AWWA etc. Invest in the standards and read up on the
> material. They can all be downloaded, for a price,
> from the standards web sites.
>
> Good Luck..
>
> Geoff Stone
>
>
>
> --- Tarak Panchal <Tarak.Panchal@Halliburton.com>
> wrote:
> <HR>
> <html><body>
> <tt>
> CAN YOU PLEASE TELL SOMETHING ABOUT GRP PIPING
> CONCEPT
> AND WHERE AND WHY IT
> IS USED.
>
> TARAK N. PANCHAL
> Kellog Brown & Root - A Halliburton Company
> mail : <a href="/group/PipingDesign/post?postID=4f6MWDxRsSChOuhw2z4kwWwM4TLdIdZVnBnAbUkxoTDR1HvahfY-5iwJJFQqhJT-0lTFGJDbZq040h4hirfFAva7f1B-xVQ">tarak.panchal@halliburton.com</a>
> <mailto:tarak.panchal@halliburton.com>
> Ph : Direct - 0065-329 4149; Board
> -
> 0065-223 8311
> Fax : 0065-423 0916
> Resi : Will be given later
>
>
>
>
> [Non-text portions of this message have been
> removed]
>
> </tt>
>
>
>
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