- A new flexible jointing method of plastic (PE) pipes
Author(s) : Yilaing He, Tianjun Zhang 2018 Las-Vegas
A new electrofusion PE belt is developed by reinforcing it with various layers of steel mesh. It’s of sandwich structure, consisting of steel mesh reinforcement, heating wire and polyethylene. One or more layers of steel mesh is encapsulated in the middle, and heating wire is embedded onto “inner side” of the...
- A RECENT SURVEY OF WATER MAIN FAILURES IN THE US AND CANADA
Author(s) : Steven Folkman 2018 Las-Vegas
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...
- ACCELERATED PIPE TEST METHODS TO EVALUATE PE 100-RC MATERIALS – POSSIBILITIES FOR ISO STANDARDISATION
Author(s) : Thomas R. Kratochvilla, Raimund Eremiasch, Christoph Bruckner 2018 Las-Vegas
In the last years effort has been made to develop and standardise new accelerated test methods to evaluate PE 100-RC materials in short times in form of test bars. The two most important developments, the cracked round bar test (CRB test) and the strain hardening test (SH test) were published as final ISO standards in...
- ACCEPTANCE CRITERIA FOR VOLUME DEFECTS IN WELDED ASSEMBLIES, DETECTED AND SIZED USING THE PHASED ARRAY ULTRASONIC TECHNIQUE
Author(s) : Dominique GUEUGNAUT, Manuel TESSIER, Romuald BOUAFFRE 2018 Las-Vegas
Given the virtual absence of available up-to-date results regarding the acceptance criteria for defects at electro-welding interfaces, a study has been launched by GRTgaz RICE with the two-fold aim of confirming the accuracy of the PAUT technique for the detection and sizing of calibrated pit-shaped defects implanted...
- AGING MECHANISM OF POLYETHYLENE PIPE MATERIAL IN CHLORINE DIOXIDE AND HYPOCHLORITE SOLUTION
Author(s) : Márton Bredács, Andreas Frank, Amaia Bastero, Alex Stolarz, Gerald Pinter 2018 Las-Vegas
Accelerated aging experiments by the immersion of a commercial polyethylene (PE) pipe grade in 10 ppm of chlorine dioxide (ClO2) and in 100 ppm of hypochlorite (HOCl) solution at 60 °C were performed. An additional immersion test was conducted in 1 ppm of ClO2 at 40 °C. The exposure parameters were continuously...
- ASSESSING THE REMAINING SERVICE LIFETIME OF PE PIPES: AN AUSTRALIAN CASE STUDY
Author(s) : Nolene Byrne, Rasike De Silva, Keith Lenghaus, Tim Hilditch 2018 Las-Vegas
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...
- BIOFILM GROWTH AND THE IMPACT IT HAS ON THE HYDRAULIC CAPACITY OF PIPELINES
Author(s) : Stefanus Johannes van Vuuren 2018 Las-Vegas
Biofilm establishes itself over a short period of time in all pipelines conveying raw and treated water. Depending on the type of biofouling, it is documented that it will inevitability lead to a reduction in the hydraulic capacity. Since none of the current design relationships used to calculate the friction loss in...
- BIOMIMETIC DESIGN CONCEPTS FOR THE PIPE ARCHITECTURE OF TOMORROW
Author(s) : Gerald Pinter, Florian Arbeiter, Johannes Wiener, Andreas Frank, Otmar Kolednik 2018 Las-Vegas
In order to further increase the fracture toughness of pipes, biomimetic layer design of the pipe wall can be used. Therein, soft polymer interlayers can act as crack-arresters in a matrix of stiffer and inherently more brittle polymers. The effectiveness of the crack arresting role of soft interlayers in a...
- C-PVC-O, PUSHING LIMITS BEYOND IN MOLECULAR ORIENTATION
Author(s) : Ignacio Muñoz 2018 Las-Vegas
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...
- CHARACTERIZATION OF POST-USE POLYETHYLENE AND POLYPROPYLENE RECYCLATE BLENDS FOR PIPE APPLICATIONS
Author(s) : Markus Gall, Reinhold W. Lang, Joerg Fischer, Ansgar Niehoff, Steven Schmidt 2018 Las-Vegas
Despite recent efforts in promoting the utilization of recycled polymeric materials for more diverse and more advanced applications, there are still significant knowledge gaps with regards to the applicability of certain recyclate types for specific “re-use” purposes. When it comes to pipe applications, for...
- CHINA PLASTIC PIPE INDUSTRY -- TECHNICAL PROGRESS AND QUALITY IMPROVEMENT
Author(s) : Wang Zhanjie 2018 Las-Vegas
As the largest production country, with numerous applications, China’s plastic pipe industry is developing steadily to meet the demand and needs. This paper analyzes the current situation and barriers, and proposes the breakthroughs to achieve a sustainable, stable and healthy development of China’s plastic pipe...
- CHLORINE DIOXIDE RESISTANT HDPE MECHANISM, ANALYTICAL TOOLS AND SOLUTIONS
Author(s) : M. Boerakker, S. van Mierloo, D. v. Beek, R. Schipper, P. Voets, M. Soliman, K. Jacobson, D. Lukes, B. Rabaud, F. Zraick 2018 Las-Vegas
HDPE pipes are used for standard pressurized water pipes, offering an excellent solution for safe transport of (drinking) water. The HDPE pipe market is growing globally. Especially in countries that suffer from water scarcity, surface water and water from rivers have to be used for drinking water supply. To guarantee...
- CONSIDERATIONS WHEN RESTRAINING MOLECULARLY ORIENTED PVC PIPE
Author(s) : G.M. Quesada, K.H. Steinbruck 2018 Las-Vegas
The benefits of molecularly oriented PVC pipe (PVC-O) are well known and documented. Numerous studies covering improved pipe impact, toughness, hydraulics, and life cycle have been published. There is less information about PVC-O pipe under pipeline hydraulic forces. The objective of this paper is to identify design...
- CPVC APPLICATION IN THE FIRE SPRINKLER SYSTEM IN CHINA
Author(s) : Jiang Tongjun, Fu Zhimin, Yang Yuanjin 2018 Las-Vegas
This paper introduces the application of CPVC pipe in fire sprinkler systems in China. The advantages and differences of CPVC pipe versus to galvanized steel pipes, the improvement of related laws and regulations and the market outlook are discussed. The overall result is a change in the upstream and downstream...
- DESIGN AND QUALIFICATION OF PA-PERT PIPE FOR OIL AND GAS TRANSPORTATION
Author(s) : Liang Yu, Akshay Ponda, Dane Chang 2018 Las-Vegas
Following the development of US shale oil and gas production since 2007, the demand for thermoplastic pipes with better corrosion resistance, and lower installation and operation cost than carbon steel pipe, has been growing significantly. Nylon 12 has been qualified for hydrocarbon transportation in offshore flexible...
- DESIGN OF LARGE DIAMETER BURIED PIPES
Author(s) : Anders Andtbacka, Frans Alferink, Peter Sejersen 2018 Las-Vegas
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...
- DETERMINATION OF THE SLOW CRACK GROWTH RESISTANCE OF PA12 PIPE GRADES
Author(s) : Mario Messiha, Andreas Frank, Isabelle J. Berger, Jan Heimink, Hermann van Laak, Florian Arbeiter, Gerald Pinter 2018 Las-Vegas
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...
- DEVELOPMENT OF CYCLIC PRESSURE FATIGUE (CPF) TEST METHOD
Author(s) : Ernest Lever 2018 Las-Vegas
Six different polyethylene materials were tested using Cyclic Pressure Fatigue (CPF) as the accelerating process to correlate the results to conventional long-term hydrostatic test results that were previously developed as part of the material qualification process. The designation of the materials was unknown to the...
- DEVELOPMENT OF LARGE-DIAMETER CONTINUOUS-FIBER- REINFORCED THERMOPLASTIC PIPE
Author(s) : Fengliang Jiang, Nian Wu 2018 Las-Vegas
This article discusses the development of the technique in producing large-diameter, medium-and-lowpressure water-delivery pipes. The continuous fiber-reinforced thermoplastic tapes perfectlyimpregnated with thermoplastic resin are wound layer by layer to form three-layer fibre reinforced polyethylene(PE) composite...
- DEVELOPMENT OF POLYETHYLENE BALL VALVE TO PURSUE ROBUSTNESS
Author(s) : Ryosuke Nagahisa, Shinichi Katoh 2018 Las-Vegas
We investigated the possibility of using a greaseless polyethylene (PE) ball valve by applying a coating on it to improve the valve’s robustness. In order to verify the valve’s operability, we performed initial-operating-torque, abrasion, and dust tests on both grease-applied and coatingapplied ball valves. These...
