Related papers
2010 Vancouver : Pa pipes for 16 bars gas pipelinesAuthor(s) : Frans Scholten and Mannes Wolters
PA11, PA12 and plasticized PA6.12 pipes are interesting candidates for gas transport and
distribution pipelines at 16 bars pressure, which is beyond the maximum pressure for
PE100 pipeline systems (10 bars). However, PA pipelines are not meant as an alternative
to PE pipelines, but to steel pipelines. Therefore,...
2004 Milan : Combined Loading of Buried Thermoplastics Pressure PipesAuthor(s) : Janson, Alferink, Wolters
This paper presents the results of work that was performed at the request of TEPPFA , The
European Plastics Pipes and Fittings Association, on the issue of “Combined loading”
(external and internal loading) of buried thermoplastics pressure pipes.
The work is of great importance for users and designers of...
2004 Milan : The Durability of a Low-Pressure Gas Distribution System of Ductile PVCAuthor(s) : Meijering, Wolters, Hermkens
One of the options for a low-pressure gas distribution system is the use of ductile PVC pipes
and joints. The long-term performance of ductile PVC pipes has been reported in a number of
previous studies. In this paper the long-term performance of the socket joints, in which
elastomeric (NBR) sealing rings are used, is...
1998 Gothenburg : Environmental Life Cycle Assessment of Gas DistributionAuthor(s) : Wikkerink, Wolters, van den Berg, Huppes
Environmental aspects tend to be increasingly important in designing gas distribution systems
and in selecting gas distribution materials. Therefore the environmental aspects of various
materials options for gas distribution networks were analyzed by means of a quantitative life
cycle assessment. This paper describes...
1998 Gothenburg : Environmental Stress Cracking of PVC Pipe MaterialsAuthor(s) : Wolters
In the Netherlands, rigid PVC and impact-modified PVC pipes have been used in gas
distribution systems for dozens of years. In general, these pipes have performed excellently.
Some years ago, however. questions were raised about the resistance of these materials to
certain gas constituents. An extensive research...
1998 Gothenburg : Welding of Peroxide, Silane and Electron Beam Crosslinked PE PipesAuthor(s) : Scholten, Wolters
An investigation has been carried out into butt welding and electrofusion welding of PEX
pipes, which had been crosslinked using the peroxide, silane and electron beam processes
(PEXa, PEXb and PEXc respectively). A new hypothesis was set-up to explain the good weld
quality of PEXa pipes electrowelded with regular...
1992 Eindhoven : Effect of Installation Conditions on Buried Plastics PipesAuthor(s) : Alferink, Wolters
Results of deformation measurements carried out
on buried plastics pipes installed at six
different tests sites are discussed in this
paper. The results show that the deflection of
buried pipes is usually rather small and the
time dependence is limited to a few years after
installation. Traffic loading does not result...
1992 Eindhoven : Service Life Anaylsis of PVC Gas Pipes in PracticeAuthor(s) : Rijpkema, Wolters
In the Netherlands about 20,000 km of uPVC
(unplasticized PolyVinylChloride) gas pipes are
in use. The oldest uPVC pipes have been in
operation for over 30 years now. These systems
were usually designed for a period of between 30
and 50 years. Probably, however, the actual
service life will turn out to be much...
1988 Bath : Deformations in Buried Flexible PipesAuthor(s) : Alferink, Wolters
Knowledge about the behaviour of buried flexible pipes has become more and more important in
the Netherlands.
It serves several objectives, for instance, to
evaluate stress corrosion, installation techniques and new materials, as well as drawing up
new design codes and test procedures for pipes
and components.
This...
1985 York : Jointing Methods for PE Casing Pipes of District Heating SystemsAuthor(s) : Alferink, Blom, Venema, Wolters
Joints in PE casings of district heating pipelines are made by extrusion welding, butt welding or sleeves in which sealing is obtained by an adhesive. To set up guidelines for making these joints a lot of research has been performed, part of which is described in this paper.
Joints of a good quality are obtained if...
1985 York : Rapid Crack Propagation in PE Pipes Studied by Modified Robertson TestsAuthor(s) : Wolters
The modified Robertson test is a test method by which ina rather simple and quick way crack arrest and (limited) crack propagation are distinguished, provided that crack speed over the crack length is measured.
Rather large variations in rapid crack propagation (RCP) behaviour of different PE types have been found. At...
1982 York : Mechanical Quality of Welds in Polyethylene Pipe SystemsAuthor(s) : Wolters, Venema
The weld strength of some butt welds and extrusion welds in pipeline systems, made of the newer PE types, has been evaluated by means of short-term and long-term tests. Butt welding appears to be a reliable jointing method. Welding strength is almost independent of the heating plate temperature and weldinq pressure. A...
The Slow Peel Test as a Tool for Assessing the Integrity of Electro Fused JointsAuthor(s) : Scholten, Wolters
