Geoff,'interesting post.
I'm surprised you couldnt press the issue on cutting out the bad segments
and seam welding in a new one. (or flange if its flanged)
The lengths are often random and all lengths have to be welded/joined
together regardless. To complete a run you need a shorter piece somewhere.
I dont see the difference.
If the spec called for welded segments he wouldnt have a case to argue. I
suspect you could have pressed the issue.
Its good for a spec to addressed repair in advance.. which is needed for
any kind of work not just FRP.
I gathered from posts you often used Thermoplastics. Whats your deciding
factor . just try to stay away from it. Thats pretty hard in your line of
business. I would have regarded that case as an aberration. Interesting
Any other thoughts.
Hi,
I once had a DN900 FRP pipe buried 8m deep. The trench was benched in steps
of 1m wide by 1.5m deep.The line was being backfilled when a "galah" dropped
a piece of equipment into the trench. It hit the FRP and it crazed like mad.
The client Sydney Water wouldnt accept any repair procedure. He said he paid
for new pipe so thats what he wanted. We had to excavate the trench to pull
sufficient pipe out to get the defective length out.
From then I have avoided FRP like the plague. Never put something in the
ground you cant fix to the satisfaction of the customer!!!!!!!
tomcruz55 <tomcruz55@yahoo.com> wrote:
And when you got a leak/break on the main header (aboveground or
underground), you can forget about using Belzona or TDW.
- In PipingDesign@yahoogroups.com, Geoff Stone DD&D Australia
<blenrayaust@y...> wrote:
> The use of large diameter FRP piping has its problems. If this is
a buried pipeline you need to recognise that the material has a very
low strain tolerance. The embedment and compaction is critical. If
the side support is compacted too much the pipe can be made egg
shaped. Then when the cover is compacted you form squarish corners.
These areas are subject to very high strains and the material may
fail from buckling.
>
> The ISO 14692 is a very good design, manufacture and construction
guide. If a manufacturer doesnt comply with this standard then steer
away from them. It is based on the British standard but with a great
deal of input from the University of Strathclyde. They specialised
in testing these materials for the North Sea oil rigs.
>
> Geoff Stone
>
> Sadath Khan <sadathcn@y...> wrote:
> Dear all
> Presently few manufacturers are even producing 4000 mm diameter
GRP pipes and being used for various projects world wide
> Regards
> SADATH
>
> Gang Cvg <cvg_gang@y...> wrote:
> Dear friends,
> Nowadays, for the sea water based cooling
> applications, GRP material is getting more acceptance
> in the industry. This shall be in conformance with
> ISO 14692 specification. The manufacturers claim to
> have executed even sizes as large as 3000 mm (if not
> larger still) in diameter with this material.
> Anybody interested?
> Good luck!
> C. V. Gangadharan.
>
> --- Sadath Khan <sadathcn@y...> wrote:
>
> > Dear All
> > Please note that for cooling and sea waters of
> > Refinereis it is better to use FRP piping systems as
> > they are non corrsoive and provides longer service
> > life with out any maintance
> > AWWA C-950 and M 45, BS5480, and ASME B 31.3 codes
> > support these non mettalic pipes
> > above is for your information
> > Regards
> > SADATH
> >
> > Rakesh Patil <rpa@l...> wrote:
> > 68" CS pipes must be available. we also used 64" CS
> > Pipes during our -
> > Refinary Expansion Project and it was for Cooling
> > Water Lines that runs
> > underground.
> >
> > do you need for the same purpose?
> >
> > regards,
> > rakesh
> >
> >
> >
> > Tushar.Zope@l...
> > Sent by: <a href="/group/PipingDesign/post?postID=_yQiGuGq93LXBabsZvh7wl1NmXIMnluxXr7omAaDYCFmBJ86GP9nV7Dlo1DISYDk1mhXE9dhjleBdIEXMBwV5VTDiMI">PipingDesign@yahoogroups.com</a>
> > 07/11/2005 09:05 AM
> > Please respond to
> > <a href="/group/PipingDesign/post?postID=_yQiGuGq93LXBabsZvh7wl1NmXIMnluxXr7omAaDYCFmBJ86GP9nV7Dlo1DISYDk1mhXE9dhjleBdIEXMBwV5VTDiMI">PipingDesign@yahoogroups.com</a>
> >
> >
> > To
> > <a href="/group/PipingDesign/post?postID=_yQiGuGq93LXBabsZvh7wl1NmXIMnluxXr7omAaDYCFmBJ86GP9nV7Dlo1DISYDk1mhXE9dhjleBdIEXMBwV5VTDiMI">PipingDesign@yahoogroups.com</a>
> > cc
> >
> > Subject
> > Re: [PipingDesign] 68" pipe
> >
> >
> >
> >
> >
> >
> > Please specify the fluid to be handles and Pr/Temp.
> > of the service.
> >
> > Then only some suggestion can be given.
> > How ever such big sizes are generally used with
> > cement pipes, CS+cement
> > lined, only CS, or FRP pipes.
> >
> > With best regards.
> >
> > Tushar Zope
> > Linde Process Technologies India Ltd,
> > Baroda, India 390 007
> >
> >
> >
> >
> > joshy joseph <joseph230276@y...>
> > Sent by: <a href="/group/PipingDesign/post?postID=_yQiGuGq93LXBabsZvh7wl1NmXIMnluxXr7omAaDYCFmBJ86GP9nV7Dlo1DISYDk1mhXE9dhjleBdIEXMBwV5VTDiMI">PipingDesign@yahoogroups.com</a>
> > 07/09/2005 02:11 PM
> > Please respond to
> > <a href="/group/PipingDesign/post?postID=_yQiGuGq93LXBabsZvh7wl1NmXIMnluxXr7omAaDYCFmBJ86GP9nV7Dlo1DISYDk1mhXE9dhjleBdIEXMBwV5VTDiMI">PipingDesign@yahoogroups.com</a>
> >
> >
> > To
> > <a href="/group/PipingDesign/post?postID=_yQiGuGq93LXBabsZvh7wl1NmXIMnluxXr7omAaDYCFmBJ86GP9nV7Dlo1DISYDk1mhXE9dhjleBdIEXMBwV5VTDiMI">PipingDesign@yahoogroups.com</a>
> > cc
> >
> > Subject
> > [PipingDesign] 68" pipe
> >
> >
> >
> >
> >
> >
> >
> > Hello Friends
> >
> > how is everybody
> >
> > Guys i would like to use 68" line for a special area
> > inside refinery is
> > there any pipes avialable in ASME or API standards
> > please suggest me
> >
> > regards
> >
> > joshy
> >
> >
> >
> >
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Received on Tue Sep 13 12:17:00 2005