Related papers
2006 Washington DC : An Effective Barrier Pipe System for Contaminated LandAuthor(s) : Christodoulou, Wilson, Hunter, Bowman
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...
2006 Washington DC : Second Generation Skinned Pipes with Enhanced Fracture ResistanceAuthor(s) : Wood, Richards, Street, Muckle, Bowman
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...
2001 Munich : Measurement of Scores and Scratches on PE Pipes used in No-Dig OperationsAuthor(s) : Stokes, Potter, Muhl, Acland
Research indicates that the scoring of polyethylene pipes that can occur during directional
drilling operations in clay soils will not exceed the specification of 10% pipe wall scoring
depth. However, a higher level of damage may occur in different types of soils from these
operations. Further investigations from...
1998 Gothenburg : A New Approach to the Instrumented Falling Weight MethodAuthor(s) : Lawrence, Rasbash, Potter, Teo
Structured wall plastic pipe has been in existence for many years, but there remains a need for
an appropriate method for assessing the durability of their comparatively thin walls in actual
service. In normal operation this has not manifest itself as a problem, but the fact that damage
can be sustained during...
1998 Gothenburg : Dynamic Pressure TestingAuthor(s) : Lawrence, Teo, Potter
There is increasing evidence that dynamic testing is a most powerful. if not the only
practical, method of evaluating whole plastic pipe for its long term service potential.
Indeed in some instances this method is used as the primary indicator of performance in
the researcNdevelopmentaI process of these products :...
1998 Gothenburg : Dynamic Test Method for the Evaluation of Butt WeldsAuthor(s) : Lawrence, Potter, Teo
When butt welds fail in servicc it is normal to find that the initiation site of the fracture occurs
at the point where the roll bead attaches to the main body of the pipe. The ratio of hoop stress
to longitudinal stress for 'thin walled' pipe is approximately 2 : 1 and so it is more likely that
these transverse...
1998 Gothenburg : Plastics Pipes - Future in the Water IndustryAuthor(s) : Stokes, Edwards
The paper examines the business and regulatory background to the
infrastructure investments anticipated in the next few years, from
the point of view of a major UK Water Company. Past performance
of the use of plastic pipes for sewers and water mains are examined.
Shortcomings of the products are identified and...
1995 Edinburgh : Behaviour of notched fatigue dataAuthor(s) : Lawrence, Potter, Teo
This paper first outlines the case supporting
the use of a fatigue based test method for plastlc pipes.
listing the factors that have to be addressed in its use
and by reference to a large body of other work justifies
its adoption into the pipe industry. It then presents
further evidence that support the case that...
1995 Edinburgh : Enhancing the performance of Plastics Pipes, Fittings & JointsAuthor(s) : Bowman
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...
1995 Edinburgh : Factors affecting the implementation of Vee notched plastic pipe testsAuthor(s) : Lawrence, Potter, Teo
The ultimate reliability of the data
generated on tests, both static and dynamic, on
"notched" plastic pipes samples is cmcially
dependent upon the perfection of the actual notch root
and the material immediately surrounding it. This
paper d d e r s a number of the important factors
relating to the production of the...
1995 Edinburgh : From Pipe to PipelineAuthor(s) : Stokes, Morris
At this Conference, the main focus is on the pipe : hardly surprising since this forms a large part of the material cost of a sewer, water, gas or fuel line. However, the pipe is often only a small part of the total cost of a pipeline installation. It is the jointing of the pipes to each other and to valves and pumps...
1995 Edinburgh : High productivity butt fusion jointing of PE pipesAuthor(s) : Cartwright, Troughton, Hinchcliff, Bowman, Jenkins
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...
1992 Eindhoven : Procedures of Quantifying the Strength of Electrofusion JointsAuthor(s) : Bowman,Medhurst, Portas
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...
1988 Bath : The Fatigue Behaviour of Medium Density Polyethylene Pipe SystemsAuthor(s) : Bowman
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...
