Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.

The Resistance of PE Water Pipeline Systems to Surge Pressure [PE]


Testing Specification Design

Plastic Pipes Conference Association # 1995 Edinburgh

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 molns and are generally considered too conservativefor moreflexIble polgethylene systems. A group representing the IIK water industry induding a materlal supplier. product ~ ~ e rwid swater. oompanles wasjormed in 199i m discuss and Lnwstlgate thls apparent anomnly. With the aid of measurement on a number of in-service instdatfons known to experience surge pressures. a marlmum rate of change of pressure reaUsttmlly possible durlng a surge event was established. This rate of pressure change was used in high amplitude q d l c pressure tests carried out Ln the laboratory on notched pipe andfftWtg assemblies. Nofailures or dlscemible deterioration occured 01any ofthe products sutJ& to this repeated cydlc testing. designed to slrnulate the number of worst case eventsfeasible Ln theprojected lifetime. In conclusion it is conlffrmed that the current guidelines we indeed w y consenntlw and alternatlw remmmendations are proposed which should be applled to polyethylene pipe systems up to at least 180 mm diameter without delay.

Please note that the whole article content is available on PPCA website only :

Related papers

2014 Chicago : Standardisation Driving the Success of Polyethylene Pressure Piping Systems

Author(s) : S H Beech, P Belloir, C Salles

Plastics piping systems are specified against a relevant standard, giving dimensions, essential performance requirements, the design basis for pressure rating, and testing to prove fitness for purpose, giving the end user the confidence to use these systems. The plastics pipes industry has successfully developed...

2012 Barcelona : Harmonisation of polyethylene pipe buttfusion procedures and test methods - Final conclusions

Author(s) : Stephen Beech, Christophe Salles, Ulrich Schulte

Polyethlyene, Pipes, Buttfusion, Joining, Testing Several well established procedures are used for butt fusion welding of PE pipes globally. The most widely used are the European Single Pressure, UK Dual Pressure, and the USA High Pressure procedures. In the future it may be possible to rationalise these procedures....

2010 Vancouver : Harmonisation of polyethylene pipe buttfusion procedures and test methods

Author(s) : S.Beech

Several well established procedures are used for butt fusion welding of PE pipes globally. The most widely used procedures are the European Single Pressure, UK Dual Pressure, and the USA High Pressure procedures. In the future it may be possible to rationalise these procedures. Materials and machinery developments are...

2006 Washington DC : Development of a Whole Life Costing Model for Large Diameter Water Mains

Author(s) : 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...

2004 Milan : 20+ Years Experience with PE Pipe for Water in the UK

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...

2004 Milan : Interpretation of the Results of the Full Notch Creep Test and a Comparison with the Notched Pipe Test

Author(s) : Beech, Clutton

Design of pipe systems for lifetimes in excess of 100 years depends on accelerated testing of pipe at different temperatures, and standard extrapolation methods for assessment of the minimum required strength. However resistance to slow crack growth is an essential parameter to take into account for the development of...

2004 Milan : The Above Ground Design of Plastic Pipe Systems for Process Fluids

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...

2001 Munich : Butt Fusion Welding of Large Diameter/Thick Wall Pipes

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...

2001 Munich : Mechanisms of Slow Crack Growth in PE Pipe Grades

Author(s) : Beech, Ferguson, Clutton

Design of pipe systems for 50 year lifetimes depends on accelerated testing of pipe at different temperatures and standard extrapolation methods for assessment of whether the minimum required strength is achieved. Further acceleration is used in the notched pipe test (NPT), which is a medium term (up to 1000 hour)...

2001 Munich : PE Pipeline Systems - The Big Success Story

Author(s) : Beech, Ducan, Millar

Polyethylene has been used for pipeline applications for nearly 50 years now. It has become the prime material choice for gas and water distribution systems and many other applications worldwide. This paper reviews the growth in the market for polyethylene pipe products for both pressure and non pressure applications...

2001 Munich : The Evaluation of Factors Governing Long Term Performance of PE Electrofusion Fittings

Author(s) : Allcard, Beech

It is widely accepted that in testing, the long term fracture mode for Electrofusion (EF) socket fittings is via Slow Crack Growth (SCG), initiating from the first wire turn from the centre cold zone of the fitting. This study examines the injection moulding process and the EF welding process and their potential to...

1998 Gothenburg : Jointing Methods for Plastics Pipeline Systems

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...

1998 Gothenburg : Key Properties of Plastics for Installation and Service

Author(s) : Beech

Pressure pipeline systems are a critical application for materials and demand high levels of performance and reliability. It is not by chance that plastics pipeline systems have gained a considerable market share, particularly in the gas and water utilities supply system. This paper briefly reviews the key properties...

1998 Gothenburg : Slow Crack Growth Performance of Today's Plastics Pipeline Materials

Author(s) : Beech

Pressure pipeline systems are a critical application for materials and demand high levels of performance and reliability. Resistance to slow crack growth is a key consideration for both metals and polymers alike, which must be dealt with by the appropriate material selection, product design and manufacturing control....

1995 Edinburgh : High Integrity PE Stub Flange Connections

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...

1995 Edinburgh : Taking the stress and strain of buried thermoplastic pipe design

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...

1992 Eindhoven : The Cooling Phase of Large Pipe Manufacture

Author(s) : Pittman, Whitman, Gwynn, Beech

Comprehensive operating data from a large-scale pipe cooling lime are reported, including in-situ measurements of temperatures within the pipe wall. A finite element simulation of cooling, coupled with gravity induced flow, or slump, in the pipe wall is described. Computed temperatures within the wall are compared...

1992 Eindhoven : The Development of the Notched Pipe Test for the Assessment of the Slow Crack Growth Resistance of PE Pipe

Author(s) : Beech, Allwood

The basis for the evaluation of polyethylene materials for pressure pipe applications is hydrostatic stress rupture testing for the prediction of long term hoop strength. However it is crucially important that the fracture properties of the materials are understood and indeed may result in limitations of their use....

1988 Bath : Residual Stress in Large Diameter MDPE Water Pipe

Author(s) : Beech, Burley, Bunn

Production of plastics pipes by conventional extrusion results in 'frozen i n r stress in the pipe wall, termed residual stress. Techniques have been established for assessina the levels of ~, this stress and relating to extrusion coaling conditions by mathematical modelling. However, the effects on long term...

1979 Brigthon : Evaluation and Usage of Joint Seals of UPVC Pipe Systems

Author(s) : Hunt

Over the years tree root penetration of sewers has been a major problem in Australia in the condition of lcw annual rainfall and long dry periods as experienced in South Australia and also the subtropical Northern areas, with accelerated growth conditions of heat and moisture. As a result root growth takes the form...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationHanwha TotalEnergiesINEOS O&PIRPCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellORLEN UnipetrolPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE