Development of an Automatic Test Procedure for Determining the Mechanical Properties of HM and HD Welds with Mechanized Torsional and Linear Shear Tests

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...

Author(s) : Ilari Aho, Volker Meyer, Peter Sejersen

The lack of a cross-border acceptance of the approval of the hygienic requirements for plastic pipes systems is inefficient and expensive for the industry. The costs for testing of a pipe system range from a few thousand Euro to more than €30k /reference 3, 4/. The European Plastic Pipe and Fitting Association...

Author(s) : Sarah Eisenstat, Peter Dyke

Many cities in the US are operating their water utility on a “manage to fail” basis, meaning they are replacing >100-year-old pipes at a cycle time of over 150 years. At this rate, most of the pipes will have failed before they can be replaced. Ft. Wayne, IN made the realization that PE pipe is the solution due to its...

Author(s) : Sverre Tragethon, Martin Andersson

Global mega trends push for investments in sewage treatment capacity & efficiency. A trend is to go for central regional treatment sites, typically remotely located from dense populated cities. This calls for high capacity pressure sewage transmission pipelines. Reliable operation is of course of paramount importance...

Author(s) : Peter Verlaan

Ten years ago, The European Plastic Pipes and Fittings Association (TEPPFA) has taken the initiative to prepare a draft 'Standard for Infiltration units' based on existing national specifications, at that time (in particular) available in France, Germany, United Kingdom and the Netherlands. This draft 'Standard for...

Author(s) : Ludo Debever, Peter Sejersen, Carolin Spirinckx

Until today there are various ways of demonstrating the Environmental Performance of products, such as Life Cycle Assessments (LCA), Life Cycle Impact Assessments (LCIA), Environmental Performance Declarations (EPDs). The methods to obtain the result, however, can vary from country to country and can be interpreted...

Author(s) : Juergen Wuest, Benjamin Baudrit, Frank Dorbath, Christopher Pommer

A testing apparatus for determining the mechanical properties of electrofusion and heated tool sleeve welded joints with the mechanized linear shear test (LST) was developed. The LST-apparatus allows the recording of the force as a function of the extension / shear length. It has been proved that the linear shear test...

Author(s) : Andreas Frank, Isabelle J. Berger, Mario Messiha, Carl-Gustaf Ek, Norbert Schuler, Jens-Martin Storheil, Erwin Mayrbäurl, Steve Heeley, Frank Krause, Lodewijk Niemöller, Philippe Gabriëls, Yogesh S. Deshmukh, Florian Arbeiter, Thomas Koch, Gerald Pinter

In order to improve the circular economy of polymers in terms of sustainability and reduced carbon footprint, the increased use of recyclates has become a topic of major importance. Due to their long design lifetimes, pipe applications represent an excellent opportunity to create added value to non-virgin polymers. In...

Author(s) : Juergen Wuest, Mirko Wenzel, Andreas Bilsing, Peter Postma, Werner Wessing

Within the scope of a DVGW (German Technical and Scientific Association for Gas and Water) research project the technology of squeezing-off for PE pipes at operating pressures higher than 1 bar and the extension to new materials with higher operating pressures were investigated. For this purpose the tightness of the...

Author(s) : Francis Reny Costa, Anh Tuan Tran, Jeroen Oderkerk, Thomas Hjertberg, Christophe Salles, Ulf W. Gedde, Benjamin Rabaud, Flavia Zraick

The premature failure of polyethylene pipes in contact with high chlorine and chlorine dioxide, used as residual disinfectants in drinking water distribution, remains an area of concern for water companies particularly in regions where temperatures are regularly or seasonally high. Multiple factors can amplify the...

Author(s) : Peter Postma

On request of the Dutch DSO’s and in cooperation with all important Dutch stakeholders (producers, suppliers, contractors and the regulator), Kiwa Technology investigated the relevancy of defects found with Phased Array Ultrasonic Testing (PAUT) and if it was possible to determine acceptance criteria. The project...

Author(s) : Carolin Spirinckx, Peter Sejersen, Zoran Davidovski, Karolien Peeters

For the European Plastic Pipes and Fittings Association (TEPPFA) it is important to have an insight into the environmental aspects during the life-span of plastic pipe systems all the way from the cradle to the grave. The result of the studies allows TEPPFA and its member companies to distinct (for the pipe systems...

Author(s) : Stefan Kremling, Thomas Hochrein, Peter Heidemeyer

In plastics industry, the use of terahertz technology opens up opportunities for novel non-destructive and contactless testing applications. For example, the thickness of individual layers of a foamed multilayered plastic pipe can be monitored contactless and continuously during the extrusion process. Furthermore,...

Author(s) : Dr. Ken Oliphant, William Luff, Dr. Peter Angelo, Patrick Vibien

Managing aging pipeline infrastructure is an important part of overall pipeline risk management. The critical risk management questions for an aging infrastructure are: how quickly should replacement occur and what parts of the system should be prioritized for replacement. To answer these questions it is necessary to...

Author(s) : Florian Arbeiter, Martin Ševčík, Gerald Pinter, Frank Andreas, Pavel Hutař

Multi-layer pipes made from polypropylene have been widely used in sewerage applications for several years. Due to good material properties and generally low mechanical loads not many critical failures occur. Aim of this work is to determine, whether slow crack growth, consisting of crack initiation and crack growth,...

Author(s) : Peter Verlaan

Several scientific studies underline benefits that plastic sewers have over traditional materials like clay and concrete. A few scientific studies which confirm that statement are for example: Teppfa SMP project The SMP [explanation?] project showed that plastic systems have 75% fewer leaks than concrete. The full...

Author(s) : Pavel Hutař, Martin Ševčík, Jaroslav Kučera, Michal Zouhar, Robin Luky, Luboš Náhlík

Using linear elastic fracture mechanics a new methodology for a lifetime assessment of internally pressurized polymer pipes was developed. The concept is based on the numerical calculation of stress intensity factors for pipes under different loading conditions in combination with experimentally determined creep crack...

Author(s) : Martin Lackner and Carl-Gustaf Ek

Key words : Polypropylene, Sewage, Sustainability, Durability, High-modulus Polypropylene has an excellent track record after more than 30 years of service for nonpressure sewage and drainage applications. The inherent material properties and their development, energy and cost efficiency, pipe design and ease of...

Author(s) : Peter Postma & Hermkens René

The suitability of non destructive techniques for testing polyethylene pipe joints are investigated in a GERG (European Gas Research Group, www.gerg.eu) project. The results show that : • Both Ultrasonic and Microwave techniques have developed to a mature level. • For electrofusion joints good results are obtained...

Author(s) : Ali Ahmadnia, Peter Allan, Rob Withnall, and Jack Silver

The acoustic properties of polypropylene, polyethylene and PVC which are widely used in the automotive, construction and pipe industries were measured. The acoustical parameter selected for this study is ‘sound transmission loss’. Acoustic tests were conducted using a Bruel & Kjaer acoustic tube with four microphones...