2018 Las-Vegas : Design of large diameter buried pipes
Author(s) : Anders Andtbacka, Frans Alferink, Peter Sejersen
The behavior of buried plastic pipes is already well described in standards and technical specifications and as well as proven in real life conditions. Plastics pipes in diameters up to around 400 mm are already in use for more than 60 years and pipes with larger diameters for more than 20 years now. All with good...
2016 Berlin : The experience with the use of UPVC pipes in various buried applications
Author(s) : Frans Alferink
PVC pipes for buried applications for water, sewer and gas, has developed an excellent track record. PVC is very inert, has a high resistance against permeation of soil contaminations and gas components and meanwhile has a long proven lifetime. Next to that, the lifecycle costs of buried PVC pipe systems are amongst...
2014 Chicago : PVC-O: Expanding in Technology and Application
Author(s) : André Nijland, Frans Alferink
PVC-U is used around the globe for potable water supply and sewer applications. This is due to its strength and stiffness as well as to its excellent flow properties. PVC-U shows an excellent performance in protecting the potable water quality. And it is registered that failure rates of PVCU pipelines are very low....
2010 Vancouver : Pa pipes for 16 bars gas pipelines
Author(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,...
2006 Washington DC : Buried Plastics Chambers - Performance
Author(s) : Alferink
Plastics pipes products are more and more appreciated in sewer schemes throughout the world.
The advantages of thermoplastics, like the good resistance against sewer environments and the
possibility to built complete tight systems are many times the drivers to use thermoplastic pipes
and chambers. Plastics chambers...
2004 Milan : Combined Loading of Buried Thermoplastics Pressure Pipes
Author(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 PVC
Author(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...
2001 Munich : Performance of Buried Plastics Manholes
Author(s) : Alferink
When starting with the application of buried thermoplastics pipes in the fifties, Wavin started
to gain a lot of experimental experience with these pipes, which later formed a solid base
for the correct application of thermoplastics pipes. In analogy, a lot of experimental
experience is gained now with buried manholes...
1998 Gothenburg : Design of Thermoplastics Pipes
Author(s) : Alferink, Janson, Olliff
Extensive field trials are being performed in a project sponsored by TEPPFA and APME,to
obtain well documented information about the behaviour of buried thermoplastics pipes. as
outlined in the paper by Alferink, Bjorklund and Kallioinen (Ref 1). This information is of
vital importance to obtain a workable design...
1998 Gothenburg : Environmental Life Cycle Assessment of Gas Distribution
Author(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 Materials
Author(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 : The Design of Thermoplastics Pipes
Author(s) : Alferink, Bjoerklund, Kallioinen
Over the last 15 years several attempts have been undertaken to establish a design method for
plastics pipes (IS0 TC138 WG13) and over the last ten years to establish an unified design
method for all buried pipes (CEN TC1641165 JWGI). Several national methods are available
and it is shown over the last ten years that...
1998 Gothenburg : Welding of Peroxide, Silane and Electron Beam Crosslinked PE Pipes
Author(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...
1995 Edinburgh : Old PVC gravity sewer pipes Long Term Performance
Author(s) : Alferink, Guldback, Grootook
Wavin gained a lot of experience with operational PVC sewer pipes by monitoring installations and measuring pipe deflections over a period of about 35 years, as reflected in the database "PiPer". Some of the oldest pipes have been measured and dug up now to study the durability of these pipes. Furthermore the results...
1992 Eindhoven : Service Life Anaylsis of PVC Gas Pipes in Practice
Author(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 Pipes
Author(s) : Alferink, Wolters
Knowledge about the behaviour of buried flexible pipes has become more and more important in
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