Related papers
2006 Washington DC : Development of a Whole Life Costing Model for Large Diameter Water MainsAuthor(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 UKAuthor(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 : The Above Ground Design of Plastic Pipe Systems for Process FluidsAuthor(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 PipesAuthor(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 GradesAuthor(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 StoryAuthor(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...
1998 Gothenburg : Jointing Methods for Plastics Pipeline SystemsAuthor(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 ServiceAuthor(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...
1995 Edinburgh : High Integrity PE Stub Flange ConnectionsAuthor(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 designAuthor(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 ManufactureAuthor(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...
1988 Bath : Residual Stress in Large Diameter MDPE Water PipeAuthor(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 SystemsAuthor(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 of...
