Second Generation Skinned Pipes with Enhanced Fracture Resistance [PE]

# 2006 Washington DC

For the movement of fuel gas and water, plastics pipes are dominant in many markets, and this success has been based on single material solid wall pipes. There are now an expanding number of multi-layered plastics pipes, and described here for the first time is the performance of the second-generation of skinned pipe from Uponor Ltd. The skinned pipes described here consist of a pressure rated core polyethylene (PE) pipe, and a sacrificial skin made from polypropylene (PP). The new pipe retains all the positive values of the first generation of these pipes, but has enhanced resistance to fracture at low temperatures. The authors report on the pipe structure, provide data on skin adhesion, supply information on the electrofusion (EF) joint performance when EF fittings are jointed to this pipe, and give data on the raised fracture resistance of the 2nd generation pipes. New families, and new generations, of multi-layered plastics pipes are being developed, as such pipes can give major benefits to utility companies via enhanced tolerance to pipe laying, improved productivity of EF jointing, and raised quality of EF joint performance.

Please note that the whole article content is available on PPCA website onlySource : 2006 Washington DC


Related papers

Close-fit Pipe Lining Without the Machines

Author(s) : Derek Muckle 2016 Berlin

It has long been the case that plastic pipes have been subject of folding operations in a factory and then supplied to site for use in pipeline renovation applications. The same cannot be said for pipes subject to diameter reduction as they have, as a principle, relied on being diameter reduced at site in a forming...

Reducing Engineering Complexity of Large Diameter Close Fit Polyethylene Liner Installation

Author(s) : Derek Muckle 2014 Chicago

Polyethylene pipe is being routinely used for the close fit lining of large diameter water trunk mains, with the twin objectives of improving water quality and reducing losses due to leakage. Trunk mains serve large urban areas and by definition are large diameter pipes; examples of real lining schemes in the past 12...

THE PROTECTION PROVIDED BY SKINNED POLYETHYLENE PIPES IN HIGH AMBIENT TEMPERATURE AND HIGH ULTRAVIOLET (UV) REGIONS

Author(s) : J.Bowman 2010 Vancouver

Polyethylene (PE) resins are known to be sensitive to both sunlight and high ambient temperatures, such that excessive exposure can degrade the material. The inclusion of stabiliser packages into the polymer controls this potential for damage from outdoor aging. Reported in this paper are results on the stability and...

Understanding, then avoiding in-service failures linked to the use of the squeeze-off flow stopping technique

Author(s) : Derek Muckle 2010 Vancouver

Polyethylene pipes are widely used across the utilities sector for the safe, reliable, transportation of gas or water under pressure. The success of the material in being adopted is partly due to the ability to treat it as an engineering polymer whose properties and failure modes are well understood, predictable, and...

An Effective Barrier Pipe System for Contaminated Land

Author(s) : Christodoulou, Wilson, Hunter, Bowman 2006 Washington DC

Polyethylene (PE) based and metallic pipe systems have been assessed for their ability to stop petrol migrating through the pipe wall, fitting or joint and into water contained within the pipe. A quantitative test was devised that is capable of distinguishing between the different pipe systems. Plain PE pipe...

A MULTILAYER PLASTICS AND METALS PIPELINE SYSTEM FOR THE CONVEYANCE OF WATER THROUGH CONTAMINATED LAND; DESIGN AND FIELD EXPERIENCE

Author(s) : Hunter, Christodoulou, Greaves, Bowman, Bott 2004 Milan

The development of a pipe system designed to transport potable water through contaminated ‘brown-field land’ is described. The system is based around a multi-layer, aluminium reinforced PE pipe, and includes a full range of specially designed mechanical fittings to provide the end user with a total system...

PE, Reducing Risks in the Gas Industry by Replacing Ductile Iron Pressure Pipes

Author(s) : Muckle 2004 Milan

In 1999 the Health & Safety Executive agreed to the introduction of a new risk based methodology to be used for prioritising iron mains replacement. The introduction of this methodology combined with the results of major incident investigations has led the Health & Safety Executive to conclude that the potential risk...

Optimising the Performance of Ferrule Straps with PVC Pipes

Author(s) : Stokes, Potter, Metcalfe, Bowman, Graham 2001 Munich

The response of three different forms of polyvinyl chloride (PVC) pipe has been explored when the pipes had attached to them ferrule straps. Pipes were subjected to fluctuating internal pressure (fatigue) loading at 20°C, and the lifetimes, location of any failures and the types of failures recorded. Tests were made...

A Flexible Solution for Renovation of Small Diameter Service Pipes

Author(s) : Morgan, Muckle, Scott 1998 Gothenburg

A three way partnership has resulted in the development of a new solution to the refurbishment of old iron and steel gas service pipes. The solution which has been developed allows a flexible polyethylene replacement pipe to be inserted into the old pipe system. This avoids the need for the costly excavations or...

Skinned PE Pipe Offering Non Scrape Electrofusion Jointing and Protection During Handling and Installation

Author(s) : Muckle, Wood, Reed 1998 Gothenburg

Developed to address the practical problems experienced on site with the preparation of the surface of polyethylene (PE) pipes for electrofusion jointing, skinned PE pipe also offers the secondary benefit of general pipe protection against gouging and other forms of abrasion damage. This paper discilsses the concept...

Enhancing the performance of Plastics Pipes, Fittings & Joints

Author(s) : Bowman 1995 Edinburgh

The many technologies associated with the production, installation and uses of plastics pipes systems increase in their sophistication and diversity This paper selects and reviews changes that have and are taking place with polyvinyl chloride (PVC) and polyethylene (PE) pressure pipe systems designed for canying...

Factors affecting the fracture toughness measurement of uPVC pipe samples

Author(s) : Burn, Richards 1995 Edinburgh

Fracture toughness tests have been used with uPVC pipe for more than a decade. Standard methods of testing are described in British and ASTM Standards and in an I S 0 draft. Analysis of the British methods associated with the introduction of a fracture toughness test into joint Ausmlia/New Zealand Standards for...

High productivity butt fusion jointing of PE pipes

Author(s) : Cartwright, Troughton, Hinchcliff, Bowman, Jenkins 1995 Edinburgh

For the butt fusion joining of PE80 polyethylene pipes on site, long heat soak and cooling times predominate in the United Kingdom and other countries. The literature is reviewed to propose that these heat soak and cooling times can be significantly reduced via the use of machines with verifiable, reduced short...

Computer Aided Design of the Butt Fusion Welding Processes on Polymer Pipes

Author(s) : Dib, Day, Benkreira, Wood 1992 Eindhoven

A computer program for the prediction and optimisation of process parameters for the butt fusion welding of polymer pipes is described. At the core of the program a mathematical model predicts bead size, melt layer thickness,pipe displacement and temperature : time history during each stage of the process for...

Erosive wear Mapping of Pipe Materials

Author(s) : Wood, Moore 1992 Eindhoven

The erosion of pipe materials in slurry flow streams occurs through a variety of wear processes. As a result, the comparative wear resistance of materials is extremely difficult to predict from a knowledge of basic physical and engineering properties. Design and selection criteria must hence be based on empirical...

Procedures of Quantifying the Strength of Electrofusion Joints

Author(s) : Bowman,Medhurst, Portas 1992 Eindhoven

For two sample shapes different procedures have been examined as methods to quickly and quantitatively assess the strength of electrofusion joints. It is shown that the peel test, specified in BS7336, can be added to in order to obtain a quantitative measure of joint strength either using the % ductility on the...

The Influence of Time and Temperature on the Strength of a Multilayer Pressure Pipe

Author(s) : Bowman 1992 Eindhoven

The influence of time and temperature on the long term strength of a multilayer pressure pipe has been investigated. The pipe consists of five layers, one of which is an aluminium foil while the other four layers are polyethylene based and form the significant ( > 8 5 % ) part of the pipe wall. In respect of strength...

A new Manufacturing Technology for Large Diameter Polyethylene Pipe Fittings

Author(s) : Aboutorabi, Bowman 1988 Bath

A rwte for the marufaoture of large diameter polyethylene pipe fittings, based on a unique combination of mtommld- ing and irradiation, is pmposed. The method requires a low investment in twling but can give rise to pressure rated, mulded fittings, capable of being fusion jointed to polyethylene pipe. This...

Factors Controlling the Lifetimes of Polyethylene Pipes in the Slit Mode Failure Regime

Author(s) : Wright, Bowman 1988 Bath

Studies are reported on the performance of pipes produced fmm selected blends of polyethylene materials. The pipes were tested at a single temperature of 80°C and at irternal pressures designed to induce slit-mode failure. It is shown that blending the wrong polyethylene resins can substantially reduce performance of...

The Fatigue Behaviour of Medium Density Polyethylene Pipe Systems

Author(s) : Bowman 1988 Bath

Elevated teqerature fatigue of MDPE pipe system showed socket and electrofusion fittings had similar fatigue lifetimes, while butt jointed pipes failed at repmducibly lower lifetimes. Extrapolatims to 2O'C preserved the raking in joint performance, although combined creep ad fatigre tests showed pure fatigue...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationINEOS O&PIRPCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE
TOP