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2018 Las-Vegas : A recent survey of water main failures in the US and CanadaAuthor(s) : Steven Folkman
A recent survey again confirms that PVC pipe has the lowest break rate when compared with break rates of ductile and cast iron, asbestos cement, steel, and concrete pipe. Other results of interest to water utilities and engineers are discussed.
During 2017, Utah State University conducted a survey of utilities across...
2018 Las-Vegas : Assessing the remaining service lifetime of PE pipes: an australian case studyAuthor(s) : Nolene Byrne, Rasike De Silva, Keith Lenghaus, Tim Hilditch
Plastic pipes have been utilized in the Australian gas distribution network since the early 1970s. The most common plastic type found in Australia is polyethylene (PE), although nylon is extensively used in New South Wales. Early installation of PE pipe was completed using the first generation high density type PE50...
2018 Las-Vegas : C-PVC-O, pushing limits beyond in molecular orientationAuthor(s) : Ignacio Muñoz
During the last years PVC-O has become a popular product in pipe business due to the huge improvements of mechanical properties of PVC after orientation. At the same time, CPVC has become an important choice for hot water conduits in in-house applications. Molecor has started a research program to evaluate the...
2018 Las-Vegas : Design of large diameter buried pipesAuthor(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...
2018 Las-Vegas : Determination of the slow crack growth resistance of PA12 pipe gradesAuthor(s) : Mario Messiha, Andreas Frank, Isabelle J. Berger, Jan Heimink, Hermann van Laak, Florian Arbeiter, Gerald Pinter
Since the last decade polyamide 12 (PA12) has been successfully introduced as material for SDR 11 gas piping systems up to 18 bar, representing itself as an attractive alternative to steel pipes for high-pressure applications. Practical experience has confirmed that beside the higher strength, PA12 pipe grades also...
2018 Las-Vegas : Harmonizing the european hygienic requirementsAuthor(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...
2018 Las-Vegas : HDPE Pipe as a Solution to Utilities Operating on a Manage to Fail BasisAuthor(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...
2018 Las-Vegas : Innovations in production of corrugated pipesAuthor(s) : J. Vlachopoulos, M. A. Lupke
A very tight-fitting bell-and-spigot inline coupler, minimizing the gap between connecting pipe segments, and a space efficient pulsating corrugator, requiring just three mold block pairs, were developed.
The author of a recent article in New York Times [1] claims that some 300 Billion dollars are needed to repair the...
2018 Las-Vegas : Large diameter spiral wound pressure pipesAuthor(s) : Bülent Kuzkaya
Spiral wound pipes are becoming more and more important in larger diameter HDPE pipe production technology. The spiral wound structured wall pipes with profiles are already well known and used for several low or non-pressure pipe applications. This paper shows that spiral wound pressure pipes can fulfill the...
2018 Las-Vegas : Multilayer polymer pipes - Possible utilization of recycled materialAuthor(s) : Pavel Hutar, Jan Poduska, Pavol Dlhy, Andreas Frank, Jaroslav Kucera, Jiri Sadilek, Gerald Pinter, Lubos Nahlik
This paper investigates possible use of recycled material as a part of a multilayer polyethylene pressure pipe system. Crack propagation in different configurations is simulated. Lifetimes of pipes containing recycled material are calculated. Results are compared with lifetimes of pipes made of virgin...
2018 Las-Vegas : New crosslinked (PEX) pipes from sustainable resourcesAuthor(s) : Jacob John, Andrew J. Ortquist, Mats Thunwall, Patrik A. Roseen
This study investigates production of crosslinked polyethylene (PEX) pipes using a resin obtained from a renewable resource via twin-screw extruder technology. PEX pipes were extruded using petroleum-based and renewable high-density polyethylene (HDPE) for comparison. Testing using relevant ASTM standards on the new...
