Pipeline Systems Made of Plastics Pipes Extruded from PE [PE]
# 2001 Munich
Lifetime expectations play a major role when selecting materials for pressure pipes.
Information on the service life of a piping system made of polyethylene can be gained from
the creep rupture tests at various temperatures being evaluated by standardized extrapolation
methods (ISO/TR 9080). With the help of test results on modern bimodal pipe resins the
different failure mechanisms will be explained and differences to the second-generation PE
material demonstrated. One can conclude that -professional handling and design providedthe durability of modern pipe systems is only limited by the thermo oxidative ageing of the
material. Practical experience for 45 years show quite clearly that plastics pipe systems do
not "fade away" after the end of the service life guaranteed in the relevant standards. However,
whether this service life will last for more than one thousand years, cannot prove the question.
Please note that the whole article content is available on PPCA website only
Author(s) : Stephen Beech, Christophe Salles, Ulrich Schulte
Polyethlyene, Pipes, Buttfusion, Joining, Testing Several well established procedures are used for butt fusion welding of PE pipes globally. The most widely used are the European Single Pressure, UK Dual Pressure, and the USA High Pressure procedures. In the future it may be possible to rationalise these procedures....
The completion of a pressure test is mandatory for all new pipe systems. Its purpose is to demonstrate the overall leak-proof condition of the system. In the course of this test, HDPE pipes of SDR 17 class are exposed to high stress loads. In an extensive test programme, all failure mechanisms observed in long-term...
After the discovery of the low-pressure process for the production of polyethylene with the aid of Ziegler catalysts, only another year went by before pipes were being extruded in highdensity polyethylene. In the same year, at the end of 1954, Hoechst had already begun to carry out long-term failure tests on HDPE...
There are three factors that can influence the service life of plastics pipes: mechanical overloading, environmental stress cracking and degradation caused by oxidation at high temperatures. This article deals primarily with the degradation that occurs during processing at high temperatures and also – as an...
The new generation pipe materials PE 100 are now well positioned in the market because
of their unusual combination of mechanical properties. Major advantages are high resistance
versus slow crack growth combined with superior stiffness. These new PE 100 resins show
very high long term hydrostatic strength for...
The development of a large aeroplane with two decks and a capacity of more than 500 passengers yields numerous problems in structural design, logistics, passenger systems etc., including special requirements for the fresh water supply system. The reliability of this system is very important, especially during long...
Recently Business Unit Polyethylene of Hoechst AG developed a Ziegler-catalyst-system
providing very high catalyst activity even in presence of high hydrogen concentrations. The
catalyst is applied to an appropriaie Z-stage-polymerization process. This technology is
carried out in a modern, fully automated production...
HDPE Pipe Application in Alpine Regions
Author(s) : Schulte
Thermal Ageing of PE 100 Pipes for Accelerated Lifetime Prediction under Service Conditions