The World
Plastic Pipes Conference Association # 2006 Washington DC
Shepherd, Headford, Jordan, Reeves, Walton
In Europe polyethylene (PE) has been chosen almost exclusively for gas mains for many years because of economic, technical and safety reasons but in the water industry a number of different materials are still used for pressure water mains. Indeed at sizes above 355mm (14 inch) most new large diameter water mains are still laid in ductile iron. Often these large diameter water schemes are designed by consultant engineers who are not familiar with the benefits that can be achieved by using flexible and weldable PE pipes. Therefore material choice is often based on the cost of the pipe itself and the cost of the total installation, including the cost of trenching and the bedding/surround, is not considered. It is even more unlikely that the operational and maintenance costs are taken into account. Therefore, it was decided to develop a whole-life costing model for large diameter water mains in which the full life cost of Polyethylene (PE), Glass Reinforced Plastic (GRP) and Ductile Iron (DI) water pipes within the range 400 to 900mm (16 to 36 inch) can be compared (N.B. it is possible to adjust the model to cover other size ranges).
Related papers
Author(s) : Roger Jordan, Ryan Benner, Greg Kodweis
The Las Vegas Valley Water District (District) delivers water to approximately 1.4 million residents within the City of Las Vegas and unincorporated Clark County. The District maintains more than 4500 miles of water pipeline ranging from 4-inches to 102- inches in diameter, as well as another 2,000 miles of...
Author(s) : Edward Ingham, Mike Shepherd
Exova has previously demonstrated that under normal operating conditions PE 100 pipes would be expected to have a lifetime of over 200 years, but in the UK concerns have been reported about relatively high failure rates within the water utilities of fusion joints, particularly for large diameter pipes. For some time,...
Author(s) : Jane Toogood, Dorothea Wiplinger, Christophe Salles, David Walton
Securing access to safe water and sanitation is recognised as one of the world’s most pressing societal and environmental challenges. Launched in 2007 by Borealis and Borouge,‘Water for the World’ is a programme platform to advance solutions, expertise and know-how to address this challenge. Activities are grouped in...
Author(s) : McGoldrick, Baeckmann, Walton, Nestelberger
Polyethylene has been in use for the manufacture of piping systems since the sixties and has progressed in its property spectrum not only in terms of resistance to pressure, but also both in terms of resistance to Rapid Crack Propagation and to Slow Crack Growth. In terms of processing friendliness however, further...
Author(s) : Catanzano, Bosetti, Walton, Serrao
The development of gas, water and sewerage networks greatly enhanced city life in the late 19th and early 20th Century providing much needed street lighting and dramatically reducing water borne disease. Understandably in many European cities these underground piping systems are now showing serious signs of their...
Author(s) : Becker, Shepherd
In common with most other major cities around the world, London has grown outwards from the centre as its population has increased. What may not be appreciated is that this holds true not only for the roads and buildings but also for the buried infrastructure, particularly the water mains and sewers, which were the...
Author(s) : Headford, Hill, Wilson
The United Kingdom is the most highly developed PE pressure pipe market in the world. Following pioneering work done in the USA and Germany, it was the UK that was first to adopt PE on a large scale for gas, and then for water distribution. The 100% PE policy of British Gas, and wide range of sizes used (at low...
Author(s) : Shepherd
Polyethylene pipeline systems have now been used with considerable success by the UK Water Industry for over twenty years. Most, if not all, water companies now regard polyethylene as the default material choice for all normal distribution system applications. i.e. up to 300mm nominal diameter. However, for larger...
Author(s) : Alessandro Soresina, David Walton
AEM S.p.A. is the leading Italian company in the management of public utility services, based in Northern Italy (Milan), and operates in the sectors of electricity, gas and heat, telecommunications and other services which include both public and aesthetic lighting.The parent company, AEM S.p.A.have been listed on the...
Author(s) : MacKellar, Headford, Ingham
This paper provides an overview of the basic properties of plastic pipes, in the range 50mm to 400mm, and how these should be used in the design of above ground process pipe systems made of PE and PVC. It covers the basic properties of plastics, examples of the determination of load cases and describes the basic types...
Author(s) : Hill, Wilson, Headford
Butt fusion welding is the most reliable and unobtrusive method of joining PE pipes (and spigot fittings) of virtually any size-except perhaps the smallest where other methods are usually preferred. It is the dominant method of jointing both medium and large pipe sizes, but for different reasons. In medium pipe sizes...
Author(s) : Headford
Jointing Methods for Plastics Pipeline Systems AL Headford (Durapipe S & LP, UK) ee Introduction The basic requirements for pipe Jointing are common to all pipe systems made from any material (including traditional materials), whether they be for sealed pressure usage or non-pressure usage. These are a) minimal...
Author(s) : Shepherd
This presentation is written from the perspective of the water industry and is therefore mostly concerned with pressure pipes for potable water as this is far and away the biggest area of use of plastic pipe systems. The Water Industry has been constructing its pipe network for over 150 years and it has been estimated...
Author(s) : Headford
A novel polyethylene stub flange adaptor is described which allows size-for-size connection, in terms of the respective bores, to iron pipes or fittings. The end load performance of this product is significantly superior to that achieved with conventional polyethylene flanges, especially at large pipe diameters, and...
Author(s) : Boot, Headford
This paper summarises current design practices for buried thermoplastic pipelines subjected to combined gravity and internal pressure loadings. It suggests that accurate predictions of stabilised deformations are neither possible nor necessary, but that appropriate structural design methodologies should instead...
Author(s) : Beech, Headford, Hunt, Sandilands
The guldeUnes g h n in BS CP 312 :Pwt 2 : 1973 w e recommended to the UK toater industryfor the deslgn of polyethylene pfpeline systems to toke inin account the effects of tmnsient [surge) pressurejluctuatlons with respect to fatigue (ref.1). These guIdelInes we based on earlier experience wlth PVC-Usewer h i n g...
Author(s) : Walton, van Houten
Electrofusion fittings have now been widely accepted within the European Gas Industry for jointing polyethylene pipe. with a high potential demand for electrofusion couplers, Wavin applied its plastics process knowledge to develop an efficient and cost effective co-extrusion manufacturing technique. In this method a...
Author(s) : Walton, Elzink
One of the main reasons that plastics have not found more extensive use in non pressure sewer schemes has been concern about the long term deformation characteristics of the pipeline. In order to investigate this phenomenon the flexural behaviour of u W C sewer pipes installed in Western European countries, including...
Author(s) : Shepherd, Water, Hill
Author(s) : Walton, Al Mehairi, Ebner, Jepson
Members of the Association
