Padmaja,
Electrofusion fittings for PE are very expensive. The largest I have used were DN500. these were purchased from GE in the UK.
Generally you use a butt fusion welding machine to join PE pipe. Up to DN2000 has already been done. Generally the welding is carried out by specialist contractors who have the machimes. If you want to know the process Driscopipe have a video of how the jointing technique is used. Also see Dixon website below. Georg Fischer from Switzerland have an infrared welding machine.PE100 requires the two step pressure techinique to be successful.
The welds are carried out on the bank and then the pipeline lowered into the trench. Final welds may require either a flanged joint or a pit dug to house the welding machine. Lowering butt fusion welded fittings into a trench can impose loads on the welds that result in failure. A welded joint is only 80% as strong at most of the parent material.
Welding machines for PE are shown on the Internet. Famous brands include RothenBerger from Europe. I am sure that they are available in the USA and other parts of the world.
Care should be taken that any weld is given sufficient time to cool. Contractors try and rush the cooling process and get more welds per day than they should > This could result in a failed weld, even after a hydrostatic test.
Australian Standards cover the design and installation of buried flexible pipelines. www,standards.org.au and look for AS 2566.1 & AS 2566.2.
References include Plastic Pipe for Water Supply and Sewerage Services by Lars Eric Janson is a classic text.
A google search resulted in the following in a few seconds. Why dont you, Padmaja, use Google??????????? Specific information is available from amnufacturers.
You need to recognise that the thermoplastic pipe industry is not as mature as the traditional amterials. Hence a great deal of the technology lays with the manufacturers. Codes like ASME B31.3 are woeful when it comes to non ferrous materials. Hence the Forum will generally refer you to manufacturers. Cut out the middle man and then come back if you dont understand anything.
Have you considered using ABS. Tyco manufacture in Australia, Malaysia and Indonesia. They export to 57 countires product up to DN800. This can be solvent welded. Class 15 is available ( design rating 1500 kPa at 20C). ABs does not degrade with temperature as PE does. Also its coefficient of expansion is half that os PE. It also has a higher modulus that helps in the buried flexible pipe design and construction. Solvent welding avoids the hazards of an electrical powered butt welding machine in a wet trench. Solvent welded joints are stronger than the parent material as you have the socket as reinforcement.
Note that ABS comes also with a rubber ring joint so you can install like ductile iron. No welding required. You will of course need thrust blocks at tees and changes of direction.
The product is great for sea water cooling and sewerage services.
ABS to AS 3518 is not the same material as used in the USA that gave them all those problems. it has been made here for thrity five years using a more robust resin.
Geoff Stone
http://www.tycoflowcontrol.com.au/tycowater/plastic_pipeline_systems/Overview/pl\
astic_products
http://www.pipa.com.au/PolyTech.html http://plastics.dow.com/plastics/about/polyethylene.htm http://www.dixonind.com.au/ http://www.twi.co.uk/j32k/protected/band_3/ksfc004.html http://www.iplex.com.au/
Hello sirs,
Thanks for your valuable reply. I am presently doing feasibility study regarding usage of PE pipe in our project . We are preferring to use PE pipe for underground services because of supports required for above ground service and high thermal coefficient which requires large expansion loops . But the limitation of the PE pipe even in underground service is if we are going for higher size diameter than pressure withstandability becomes lesser and service life also becomes lesser.
My query is also for joining techniques. Generally for underground usage we prefer not to have bolted connection. For our purpose electrofusion welding of PE pipe is feasible. But it also has size limitation. So pls if any of you had dealt with PE 100 pipe than can you suggest any alternative for this joining technique.
Regards,
Padmaja.
Geoff Stone DD&D
Australia To:
PipingDesign@yahoogroups.com
<blenrayaust@yaho cc: (bcc: Padmaja
Maurya/JAMNAGAR/RIL)
o.co.uk> Subject: Re: [PipingDesign] HDPE
pipe size
Sent by: Importance: Normal Sender's OU:
Reliance |------------------|
PipingDesign@yaho
| [ ] Confidential |
ogroups.com
|------------------|
09/01/2005 05:51
PM
Please respond to
PipingDesign
Hi All,
I know of DN2000 pipe being manufactured in Europe. It was extruded in 1000m lengths into the harbour. Yes the harbour was used as the cooling bath. Dont know if the "greenies" would let that happen today. Anyway the pipe was loded onto a train and transported to Poland from Germany by train in 1000m lengths. it was then laid with just the 7 butt welds.
I have seen the video of the exercise; so as Herculean task as it seems it did happen. I think the pipe manufacturer was Borealis. So you are not limited to what is produced in your country. If you need large diameter PE it could be floated across oceans if that is what your heart desires.
Geoff Stone
Robin Badcock <rbadcock@vision.net.au> wrote: Dear no name,
Have you thought of contacting your local supplier/manufacture
representative for this information? I am sure that if you intend to use
this product on a project it will have to be procured at some point. It is
of little worth having piping sizes and information supplied by others if
for some reason it is not available at a semi local level and may need to
be
imported. This is especially so if project deadlines are to be met.
I hope this assists you in your quest for information.
Cheers,
Robin
> Dear Sirs,
>
> I require information for maximum size available in PE 100 ( HDPE
material)
> and pressure that can be withstand by that pipe.
>
> Thanking you,
>
> Regards,
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping Calculations
> http://www.pipingoffice.us/
> =========================================
> Main site: http://www.pipingdesign.com
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
SPONSORED LINKS
Online mechanical engineering degree Process piping Mechanical engineering
Mechanical engineering class Mechanical engineering college Mechanical
engineering degree
To unsubscribe from this group, send an email to: PipingDesign-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Design Detail and Development (a division of Blenray Pty Ltd)
Mail Address PO Box 1351 Castle Hill NSW 1765 Australia Tel Mob 0402 35 2313 Office 02 8850 2313 AH 02 8850 2324 We specialise in pipe network and waterhammer analysis, pipe stress analysis, the design of buried pipelines and thermoplastic pipe systems.
[Non-text portions of this message have been removed]
Yahoo! Groups Links
[Non-text portions of this message have been removed]
SPONSORED LINKS
Online mechanical engineering degree Process piping Mechanical engineering
Mechanical engineering class Mechanical engineering college Mechanical
engineering degree
To unsubscribe from this group, send an email to: PipingDesign-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Design Detail and Development (a division of Blenray Pty Ltd)
Mail Address PO Box 1351 Castle Hill NSW 1765 Australia Tel Mob 0402 35 2313
Office 02 8850 2313 AH 02 8850 2324
We specialise in pipe network and waterhammer analysis, pipe stress analysis,
the design of buried pipelines and thermoplastic pipe systems.
[Non-text portions of this message have been removed] Received on Fri Sep 02 18:27:00 2005
This archive was generated by hypermail 2.1.8 : Mon Oct 27 2008 - 20:24:09 EDT