Plastic Pipes Conference Association # 2012 Barcelona
Libert Daniel
Heating and/or air conditioning systems based on ground heat pumps are increasingly popular in European countries, their growth fuelled by both private and public investments in sustainable energy sources. These systems typically circulate water inside boreholes, effectively using the ground as a constant temperature heat source or heat sink for their thermodynamic cycle. For boreholes reaching depths of up to a few hundred meters, heat exchangers are commonly made from high density polyethylene pipes & fittings systems. These geothermal probes must withstand the sum of hydrostatic and circulation pressures. To resist the effect of continuous pressure to which the pipes are submitted, high density bimodal polyethylene PE100 grades are of course a must for the geothermal application. Designed for 100 years of use and most often not accessible for maintenance during their lifetime, these pipes are also made to last. For this reason, this paper further shows that the material of choice for geothermal probes is PE100-RC, the latest generation of PE100 offering a superior resistance to slow crack growth. This characteristic allows stopping the crack propagation from scratches resulting from the handling of pipes in rough building area. It also allows the pressurized pipes to withstand continuous concentrated loads resulting from the installation procedure of the pipes in the borehole itself.
Related papers
Author(s) : Daniel Currence, Michael Plumier
Over a ten-year period, the North American corrugated plastic pipe industry successfully demonstrated that post-consumer and post-industrial recycled materials could be responsibly incorporated into corrugated pipes used for drainage applications. Prior to this work, the material standards were established for ...
Author(s) : Dr. Love Pallon, Dr. Karin Jacobsson, Daniel Ejdeholm, Marie Allvar, Rikard Kärrbrant
This work presents the development of the Full Length Tensile Test (FLTT), a method that enables an objective judgement of welding quality of electrofusion welds by measuring the energy to break (J/mm2 ). In this way a brittle, ductile and transitional mode failure can be differentiated without subjective visual...
Author(s) : Karin Jacobson, Daniel Ejdeholm, Rikard Kärrbrant, Kenth Olsson
IT IS WELL KNOWN THAT IT IS NECESSARY TO SCRAPE OFF A 0.2 MM OUTER LAYER OF A POLYETHYLENE (PE) PIPE SURFACE AT THE LOCATION FOR THE ELECTROFUSION WELD PRIOR TO WELDING. THE REASON FOR THIS PROCEDURE IS SAID TO BE REMOVAL OF AN OXIDIZED LAYER WHICH CAN RESTRICT MOLECULAR DIFFUSION ACROSS THE WELDING INTERFACE LEADING...
Author(s) : Daniel Libert, Pierre Belloir
PE-RT is now well established in the Hot & Cold market with various pipe designs and associated standards. For many years, PE-RT has found a good place in Under Floor Heating applications in many places around the world. The comprehensive testing performed on raw materials led to a better knowledge of high temperature...
Author(s) : Daniel Ejdeholm, Karin Jacobson
Since decades, non-metallics have been the preferred choice of material to be used in the process equipment of pickling plants to cope with the metal-corrosive environments. The present experience regarding the corrosion performance of different plastic materials in various pickling applications and elsewhere has...
Author(s) : Sergio Kempenich, Markus Hartmann, Carsten Schuett, Ralf Tuellmann, Daniel Crucello, Vitor Lavini
Unplasticized Polyamide 12 (PA-U 12) has been investigated as an alternative to steel for high pressure gas installations with operation pressures up to 18 bar (261 psi). Several tests developed and conducted in Germany, USA and Brazil have reached positive results in terms of performance and costs. However, Brazilian...
Author(s) : Lars Jacobsson, Hans Andersson, Daniel Vennetti and Sven-Erik Sällberg
Leakages are reported in flange joints of large pipelines for water supply although mounted according to recommended practise. FEM analyses and full scale experiments have been performed in order to better understand the functioning of the joints. The objectives were to find out about the sensitivity to mounting and...
Author(s) : D.Libert
Silane method is a preferred technique of crosslinking polyethylene to modify its properties. Higher ESCR as well as thermal resistance should no longer be demonstrated. Conventional HDPE, LLDPE or LDPE are known to offer different sensitivity to level of silane, curing time and temperature; rate of crosslinking and...
Members of the Association
