Papers
Plastic Pipes Conference Association # 2016 Berlin
Herbert Terwyen, Roberto de Palo, Manuel Sanchez
New standards in Italy legally require that chlorine dioxide is used as a disinfectant in any new installation that treat water for human consumption. Chlorine dioxide is preferred to other disinfectants when surface water or water from rivers is used for drinking water supply and particularly Southern European countries started to investigate this option. Next to inherent advantages of using chlorine dioxide, the stronger oxidative degradation effect on pipe materials could represent a significant disadvantage.
Due to this trend, the question about the durability of the current pipe systems and improved pipe materials for water supply becomes crucial. Accelerated test methods are necessary to evaluate the performance of materials that get into contact with water containing chlorine dioxide.
Investigations have been conducted in cooperation with IRETI (previous IREN), a major Italian multiutility. A method has been developed to differentiate PE100 pipe materials according to their resistance to water containing chlorine disinfectants.
LNE, France, developed the methodology of the NOL Ring Creep Test (Draft standard XP T 54-986) and several materials have been tested accordingly.
This article describes the test methodologies and reports the results obtained with different pipe materials. Recently developed improved grades can be clearly differentiated from standard materials.
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Author(s) : Dr. Michael Pluimer, Sara Stone
The Notched Constant Ligament Stress test (NCLS test, ASTM F2136)[1] is a test method that measures the slow crack growth in High Density Polyethylene. The NCLS test requires a notch on all test specimens to act as a stress concentration at that point so crack propagation can be easily predicted and studied. In...
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Author(s) : Carine Lacroix, Philippe Louvel, Danielle Mark, Dominique Gueugnaut
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Author(s) : Andrew Wedgner, Robin Bresser
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Author(s) : Sjoerd Jansma, René Hermkens
More than 20,000 km of rigid PVC (or PVC-U) pipes are currently in use for the distribution of natural gas in the Netherlands. In this decade, the majority of these pipes will reach their initially specified lifespan of 50 years. In the light of a possible replacement surge, it is increasingly important to...
Author(s) : Ernst van der Stok
For PE 100-RC, two tests are still under development for pipes: the point load test (PLT) and the accelerated notch pipe test (aNPT). The PLT was developed by a project group consisting of manufacturers and end users. The PLT determines the resistance to point loads as they can occur in practice. An earlier study...
Author(s) : S. Nestelberger, J. Cheng
The Point Load Test (PLT) [ 1, 2] was designed to simulate the SCG (slow crack growth) failure initiated by a rock pressing into the exterior wall of a polymer pipe. Today’s PE materials sustain long PLT testing times, due to its high SCG resistance design. Consequently, an accelerated “PLT+” with the support...
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