5 minute posters
Plastic Pipes Conference Association # 2014 Chicago
MSc. J. Weller, R.J.M. Hermkens
More than 75,000 km of PVC pipes are currently in use for the distribution of natural gas in The Netherlands, which make up over 60% of the distribution grid. To gain insight in the factors that influence the quality of those pipes a so called Exit Assessment programme was started in 2004. Part of this programme investigates how the handling of these pipes is influencing their quality. It is shown that PVC pipes wrapped in plastic sheet material are efficiently protected against UV-degradation.
In this research PVC (PVC-U, PVC-A and PVC-CPE) pipes have been exposed to direct sunlight with periods varying from 1 month to a year. Half of these pipes were wrapped in standard packaging sheets. Using a further improved test method [1] the ductility of these pipes was measured. Field failure studies have shown that the lack of ductile behaviour is the most important reason for incidents involving PVC gas pipes. With the further improved test method the ductility of the PVC pipes was determined at temperatures ranging from -25°C to +50°C. With this method it is possible to determine small changes in the ductile-brittle transition temperature of PVC. The influence of direct sunlight was shown by comparing the side of the pipe that was exposed to direct sunlight with the side that had been in the shadow. It also enabled us to measure the influence of using protective plastic sheet material.
Influence of direct sunlight on PVC without sheet material was measurable and visible after 3 months. The plastic sheet material proved to be an excellent protection against UV-degradation and preserved its function during the test period of one year. This also underlines the importance of using the plastic sheet material.
Related papers
Author(s) : Robin Bresser, Ilari Aho, Shima Holder, Tijana Duric, Kaisa Suvilampi
Through innovation and experience, PEX pipe solutions have been enabling comfortable heating and safe plumbing with a successful 50-year track record. They are an important facilitator of the green energy transition and the ambitious climate targets of, for example, the European Union (EU) Green Deal by enabling...
Author(s) : James F. Mason, Akshay Ponda, Hermann van Laak, Tobias Bauer
The long-term strength of unplasticized polyamide 12 (PA-U12) has been characterized using standard methods for plastic pressure pipe during the qualification process for use in buried piping systems for natural gas delivery operating at low ambient temperatures, usually less than 20 to 30°C at pressures...
Author(s) : Aisha Khaleel, Suleyman Deveci, Sulistiyanto Nugroho, Fatima AlHameli
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) : Antonio Rodolfo Jr., Vanderley M. John
Unplasticized (U-PVC) ABNT NBR 5647-2 regular industrial pipe samples, with nominal diameter DN 100, outside diameter 110 mm, nominal wall thickness 7.8 mm, Ca/Zn stabilized, were studied using an essential work of fracture (EWF) approach. These pipe samples were also tested for the degree of gelation via...
Author(s) : Gerald Pinter, Lukas Travnicek, Johannes Wiener, Jan Poduska, Florian Arbeiter, Pavel Hutar
Crack initiation and subsequent crack growth are known to be the key factors which determine the final lifetime of a polymeric pipe. Subsequently, exact knowledge regarding the crack growth behavior is a key issue to guarantee safe operation. Furthermore, novel concepts are needed to satisfy increasing demands, for...
Author(s) : Zhanjie Wang, Jing Guo, Lin Wang
In the past two years, the Chinese plastic pipe industry has faced a complex and changeable development situation. The domestic economy has faced the pressure of demand shrinkage, supply impact, and expected weakness, and the market has changed greatly. The impact of the Covid-19 and the influence of many unfavorable...
Author(s) : Chris Greggs
Much has been done to improve the quality and efficiency of HDPE pipe installations over the years. Now, a totally new concept for fusion where the machine meets the pipe where it lays to improve worksite safety, boost jobsite efficiency, and minimize the amount of time spent between fusions has been developed. This...
Author(s) : Karin Jacobson, Daniel Ejdeholm
Plastic pipes often have much better corrosion resistance than metallic pipes and have, in addition, the benefits of low weight and flexibility. Thanks to this, they are often used to convey chemicals. There is, however, still a large potential for a much more extensive use of plastic pipes for this application. The...
Author(s) : Suleyman Deveci, Aisha Khaleel, Birkan Eryigit
Short and long term hydrostatic pressure resistance of plastic pipes are measured according to ISO 1167, by applying an internal pressure that is calculated for the target hoop stress considering outer diameter and wall thickness of the pipe samples. Due to the nature of the extrusion process, wall thickness...
Author(s) : Dr. Ricky Selle
Structural behavior of flexible plastic manholes is very different from rigid concrete products. Although this is state-of-the-art knowledge, no international or EN standard exists on structural design of these products. Therefore, traditional soil models and soil pressure coefficients are usually applied if...
Author(s) : Yunyan Li, Qianshi Ma, Haihua Yu
Effect of sunlight and high temperature on PE-Xa pipe’s performance was investigated in this work. Pipes with different formulations, including formulations without and only with antioxidant, and formulation with both antioxidant and light stabilizer were employed to study the relationship of cross-linking density,...
Author(s) : Guido Quesada, Mark Weih
The Plastic Retainer Ring (PRR) gasket is an old friend of pipe joints, and it is still used among other sealing solutions developed more recently. With origins traced back to the end of the 1960s, it is recognized among the first solutions developed for gasketed plastic pipe joints. It is very likely to have...
Author(s) : James F. Mason, Akshay Ponda, Hermann van Laak, Buc Slay
The effects of liquid hydrocarbons on long term strength of pipe grade thermoplastic resins is an important consideration when designing pressure pipe for use in the oil and gas industry. There is an extensive body of work going back several decades descri bing these effects for pipe grade polyethylenes, and all...
Author(s) : Antonio Rodolfo Jr., Vanderley M. John
Unplasticised (U-PVC) and modified (M-PVC) pipes used in irrigation and infrastructure applications, outside diameter 326 mm, were evaluated according to various fracture mechanics methodologies, including fracture toughness (stress intensity factor KC and energy release rate GC, both at fracture), essential work of...
Author(s) : Gerald Pinter, Johannes Wiener, Florian Arbeiter, Abhishek Tiwari, Otmar Kolednik
For pipe applications, catastrophic failure due to crack growth has to be prevented by all means. Techniques to develop new and even tougher pipe materials are explored in this contribution. The aim is to create a multi-layer architecture, that exhibits high toughness as well as damage tolerance towards sharp notches....
Author(s) : Christian Schalich
Plastic pipes for infrastructure and building applications are precisely specified with regards to wall thickness and diameter. Pipe manufacturers use different measuring methods in order to ensure the required dimensional accuracy and maintain a constant high quality. This paper introduces a measuring system based on...
Author(s) : Suleyman Deveci, Nisha Preschilla, Sulistiyanto Nugroho, Birkan Eryigit
Carbon black (CB) has been used as a perfect and the cheapest solution to prevent photo degradation of polyethylene against UV light exposure. The effect of carbon black on the mechanical properties of polyethylene pipes was studied extensively, but only on well dispersed and distributed carbon black...
Author(s) : Argnani Claudio, Ing. Gianpaolo Contarini
...Clogging of the pipes can be experienced in sewer systems after a short period of service, due to the intrusion of roots from plants and trees. Plants, and in particular their roots, are attracted by the water flowing inside the pipes. These roots will strain the connections between pipes, in particular the sockets...
Author(s) : Mark Boerakker, Rudy Deblieck, a Harm Caelers, Arno Wilbers, Tine Boonen a DSM, Britta Gerets, Mirko Wenzel
Components made of plastic are facing ever-increasing demands with respect to their production, use and durability. This also holds for gas and drinking water pressure pipes made of high-density polyethylene (PE-HD), where service lifetimes of up to 50 years and in some cases even 100 years are required. One of the...
Author(s) : Sjoerd Jansma, Peter Cloos, Ernst van der Stok
This paper describes two different test methods used to determine the permeation rate of hydrogen through a reinforced thermoplastic pipe (RTP) system with a HDPE liner pipe and a gas-tight layer at a pressure of 42 bar(g) hydrogen and ambient temperature. One method involThe results of the aforementioned tests...
Members of the Association
