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GPS Publishes Guide On Maintaining Barrier Pipe Integrity - The growing number of product options for piping water through contaminated land has introduced a serious pitfall for unwary installers. GPS PE PIpe Systems published advice for installers
GPS Publishes Guide On Maintaining Barrier Pipe Integrity

 

PRZOOM - /newswire/ - Huntingdon, Cambridgeshire, United Kingdom, 2009/11/02 - The growing number of product options for piping water through contaminated land has introduced a serious pitfall for unwary installers. GPS PE PIpe Systems published advice for installers.

   
 
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Barrier pipe systems are now commonplace in brownfield redevelopment, securing water supplies against infiltration by any chemicals still present in the ground. In addition to this role they offer equally important protection against future contamination of drinking water by surface run-off, as a result of accidental spills and from locations such as petrol station forecourts.

As industrial land reuse has increased so too has the number of barrier pipe solutions in use in the UK. When working on brownfield sites, it is no longer the rule to specify metal pipe and fittings, using tape wrapping as an external protection measure. Particularly in the smaller diameters, plastic barrier pipes are now predominant in contaminated land applications. Manufacturers have introduced purpose-designed plastic pipes and fittings with an integral barrier component. Indeed, some also offer complete PE pipe systems that are fully approved by the Water Industry for use in contaminated land.

At the same time the growing number of product options for piping water through contaminated land has introduced a serious pitfall for unwary installers - if they assume that products are interchangeable. While manufacturers size their pipes and fittings according to industry norms, pipe systems are not standardised. It is inadvisable to expect that a fitting from ‘Manufacturer A’ can be used with any success on pipe produced by ‘Manufacturer B’ unless the combination is specified in the product information.

WIS 4-32-19
The newly produced Water Industry Standard relating to polyethylene barrier pipe systems for potable water in contaminated land is WIS 4-32-19. This standard defines performance characteristics and specifies contaminant protection limits for the pressure pipe and compatible fittings. Unless a specific combination of pipes and fittings has been tested successfully, it can never be approved to WIS 4-32-19 and may not be suitable, indeed even fit for purpose.

The standard was introduced as lately as 2008 and perhaps it is no surprise that any confusion regarding WIS 4-32-19, where it exists in the industry, still remains to be clarified. In a recent paper a pipe manufacturer incorrectly asserted that: "To be effective and meet the new UK standard it is desirable to use metal fittings, as plastic fittings do not provide the barrier properties for the total system, and thus such systems fail to meet the requirements of the standard". On the contrary, it is a fact that systems incorporating plastic fittings can and do meet the standard requirements. For instance Protecta-Line, which was one of the first PE barrier pipe systems to be introduced to the UK, was also amongst the first to receive formal approval to WIS 4-32-19 by obtaining a BSI Kitemark for the whole system.

Crucially the emphasis in gaining approval lies with the system, not the individual component parts. Moreover for a system to achieve approval to WIS 4-32-19, each variation of the system must pass the appropriate testing. This means that each pipe size must complete a suite of tests with the various jointing methods authorised by the manufacturer and with attached fittings and valves in all permutations.

As stated above, there are exceptions allowing product from different manufacturers to be connected, but only if that particular combination is tested and approved. The WIS’ standard includes the note: ‘... Fittings and joints manufactured by others for use with one or more pipe manufacturer’s barrier pipe system, but not tested by the pipe manufacturer, shall demonstrate dimensional compatibility with that system and include full details of all tests carried out, including permeation tests, in the Technical Data File for that product.’
Clearly the fittings and joints must be tested and approved in combination.

When alternative fittings have not been approved for use in this way, the consequences can be disastrous. Water companies and contractors need to be aware that there is a clear risk of practical difficulties and delays during installation. Not only will the installation be affected but the performance of the installed pipes and fittings will also be in question. In addition the result will certainly not be ‘WIS 4-32-19 approved’, even if the core system carries the BSI Kitemark.

Of course, it should be permissible to use different pipe systems on the same site. However, it is vital to terminate each system correctly before it connects to another. The correct way to do this is to terminate each system with the fitting tested and approved for this particular system.

In view of possible health risks, individual water companies are averse to allowing any contact between drinking water and aluminium, so it is important to use approved fittings that prevent such contact. Some fittings currently being sold as ‘approved’ do not afford this protection.

In conclusion
The demand for barrier pipes will continue to grow and the their use will become more familiar to contractors and water companies alike. According to figures published last year by the National Land Use Database the total area of previously developed land in England alone is at least 62,000 hectares and at some stage, the majority will be redeveloped to provide housing with an accompanying, extensive requirement for buried water supply lines.

A significant proportion of these supply lines will be installed in PE barrier pipe, as it offers the same benefits as normal polyethylene pipe systems, in terms of ease and speed of installation, longevity and sustainability. With the potential for water contamination at stake, it is crucial that such barrier systems are not compromised by the use of unauthorised, alternative fittings. Care must be taken to check whether or not alternative components are approved by the system manufacturer, or to work entirely within an established, WIS 4-32-19 approved PE barrier pipe system.

 
 
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GPS Publishes Guide On Maintaining Barrier Pipe Integrity

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Contact: Oxana Latypova - GPSUK.com 
+44(0)14 8044 2623 oxana.latypova[.]gpsuk.com
 
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IMPORTANT INFORMATION: Issuance, publication or distribution of this press release in certain jurisdictions could be subject to restrictions. The recipient of this press release is responsible for using this press release and the information herein in accordance with the applicable rules and regulations in the particular jurisdiction. This press release does not constitute an offer or an offering to acquire or subscribe for any GPS PE Pipe Systems securities in any jurisdiction including any other companies listed or named in this release.

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