Papers
Plastic Pipes Conference Association # 2014 Chicago
Karin Jacobson
This paper discusses the mechanisms responsible for the degradation of polyolefin pipes in chlorine dioxide. Studies of random co-polymer polypropylene, PP-R pipes that have been exposed in service connected to ClO2 disinfection systems are compared to data generated at accelerated laboratory conditions. The test method of ASTM F2023 with chlorine dioxide has been used to generate the accelerated chlorine oxidative data. Post exposure investigations used in this study focus on failure mechanism, morphology studies, additive degradation and polymer degradation. Findings are aimed to give guidance of the ASTM F2023 method’s suitability for ClO2 studies and include also a discussion of accelerated testing using high concentration of chlorine as acceleration parameter versus accelerated testing with relatively low concentrations, similar to those find in service, and high temperature.
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Author(s) : Olivera Bilic, Vivek Rohatgi, Brody Peterson, David Hukill
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Author(s) : Dolores Herran
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Author(s) : Yi Zhong, Qianshi Ma, Haihua Yu
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Author(s) : Amster Howard
This paper explores the use of a composite soil stiffness as a valuable design tool to consider when a pipeline traverses through poor soil conditions. Thermoplastic pipe are flexible pipe and require good soil support at the sides of the pipe to minimize deflection. However, sometimes the trench walls are weak soils...
Author(s) : Michael O’Rourke
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Author(s) : James F. Mason, Akshay Ponda, Hermann van Laak, Tobias Bauer
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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...
Author(s) : Sunwoong Choi, Robert Stakenborghs , Pyeongan Lee, Byoungho Choi
This work developed a hydro-axial tension (HAT) test as a whole pipe axial tensile test and applied to evaluate the polyethylene (PE) pipe and fusion joints containing various flaws. HAT test was designed to utilize hydrostatic pressure to cause axial tension in pipes. The experimental and numerical analysis was...
Author(s) : Jacob John, Suresh Shenoy, Patrik Roseen
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The use of polyethylene pipes in transportation networks of pressurized water and gas have shown superb performance over the history. High density, high-molecular-weight, and bi-modal polyethylene materials, known as PE80, PE100 and PE100RC, have successfully served the market for many years in standard applications....
Author(s) : Jie Wu, Yushan Hu, Todd Hogan
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Author(s) : Mitsuaki TOKIYOSHI, Yutaka SAWADA, Yasuhiko OTSUKI, Kensei INOUE, Takashi KURIYAMA, Toshinori KAWABATA
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Author(s) : Kevin White, Shad Sargand
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Author(s) : Rafael A. García-Muñoz, Rafael Juan, Mónica de la Cruz, Beatriz Paredes, Carlos Domínguez
Plastics are widely used in various industries, resulting in the generation of significant amounts of plastic waste, which causes environmental and economic problems. Although mechanical recycling is the most commonly employed technology, the resulting recyclates often suffer from degradation and contamination. This...
Author(s) : Yanlei Hu, Jin Sun
Slow crack growth is the main reason for brittle failure of polyethylene pipes. At present, the traditional slow crack growth test generally has many problems, such as too long test time, using chemical reagents that pollute the environment, poor reproducibility, etc., which limit the accurate evaluation of the slow...
Author(s) : Rachel Anderson, Rujul Mehta, Alex Stolarz, Todd Hogan, Stephanie Whited, Joel Wieliczko
Growing worldwide demand for sustainably made irrigation systems has driven the creation of new resins for longer-lasting, more durable, recycle friendly, and cost-effective pipe that can better tolerate extreme conditions year after year. Microirrigation systems deliver vital water and nutrients where they’re needed...
Author(s) : Dr. Tania Weyland, Dr. Tobias Eltze, Dr. Rolf Wittlinger, Marie-Laure Bertet, Gregor Huber
A significant amount of water is lost in transit from the water treatment plant to the consumer. A major cause of water leakages is the deterioration of assets including the use of disinfectants. Using chlorine-based disinfectants is known to be extremely effective in eliminating waterborne pathogens, but they also...
Author(s) : Ernst van der Stok, Nadia Luijsterburg-Vleugels
The latest generation of polyethylene grades (PE 100-RC and PE 4710 PLUS) have an increased resistance to slow crack growth. Such cracks can be initiated by either a scratch during installation or a rock indentation during use. The Accelerated Notch Pipe Test (ANPT) was standardized in ISO 13479 in 2022 to allow the...
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