2021 Amsterdam : MODIFIED PLAIN STRAIN GROOVED TENSILE TEST TO EVALUATE LARGE DIAMETER PE PIPES
Author(s) : Thomas R. Kratochvilla, Patrick Grünbeck, Christoph Bruckner, Raimund Eremiasch, Harald Wilhelm, Mario Vukelja
In the last decades pipe dimensions of extruded PE pipes have reached new orders
of size. Today, PE pipes with outer diameters of up to DN/OD 3500 mm are produced
and used for pressure pipe applications like seawater intake/discharge, outfall, sewage
and industrial process piping systems.
To test the long-term...
2021 Amsterdam : SLOW CRACK GROWTH RESISTANCE OF REPROCESSED PVC
Author(s) : Andreas Frank, Mario Messiha, Günter Dreiling, Norbert Schuler, Jens-Martin Storheil, Erwin Mayrbäurl, Stuart Ramella, Frank Krause, Rudi Berning, Philippe Gabriëls, Alpay Aydemir, Thomas Koch, Florian Arbeiter, Gerald Pinter
The Cyclic Cracked Round Bar (CRB) Test has been applied to study the slow crack growth
(SCG) resistance of virgin, recycled, and reprocessed PVC-U. This fracture mechanical test allows a
quick ranking of the SCG resistance of PVC-U. A clear correlation between the K-value and the SCG
resistance has been elaborated....
2021 Amsterdam : WHY PA-U12 HIGH PRESSURE PIPES DO NOT CARE ABOUT “ROCK ́N ́ SHARD” IN VIEW OF PAS 1075
Author(s) : Hermann van Laak, Jan Heimink, Mario Messiha, Andreas Frank, Christoph Bruckner, Thomas Kratochvilla
For high pressure pipes above maximum operation pressure of 10 bar, this paper
emphasizes PA-U12 as the easy to install alternative to steel. It underlines the superb
performance of PA-U12 pipes for alternative installation techniques without need for a
separate mechanical protection. An unplasticized polyamide 12...
2018 Las-Vegas : A recent survey of water main failures in the US and Canada
Author(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 : Molecularly oriented awwa C909 pipe for seismic applications
Author(s) : Richard St-Aubin, Dr. Thomas O’Rourke, Dr. Brad Wham, Blake Berger
Molecularly oriented polyvinyl chloride (PVC-O) pipe has been found to withstand large ground deformation during seismic events without damage. The properties of PVC-O pipe that support this performance have been investigated in a multi-year testing program undertaken at the Geotechnical Lifelines Large Scale Testing...
2018 Las-Vegas : Slow crack growth resistance of non-virgin polymers
Author(s) : Andreas Frank, Isabelle J. Berger, Mario Messiha, Carl-Gustaf Ek, Norbert Schuler, Jens-Martin Storheil, Erwin Mayrbäurl, Steve Heeley, Frank Krause, Lodewijk Niemöller, Philippe Gabriëls, Yogesh S. Deshmukh, Florian Arbeiter, Thomas Koch, Gerald Pinter
In order to improve the circular economy of polymers in terms of sustainability and reduced carbon footprint, the increased use of recyclates has become a topic of major importance. Due to their long design lifetimes, pipe applications represent an excellent opportunity to create added value to non-virgin polymers. In...
2018 Las-Vegas : The world's first class 3 safety related nuclear PE4710 piping project - 10 year review
Author(s) : Lonnie Corley, Dane Chang, Harvey Svetlik, Matt Brandes, Thomas Musto, Frank Schaaf, David Fink
This paper presents a brief overview of a challenging project at the Callaway Nuclear Power Plant where HDPE was utilized to replace degraded steel buried piping in a Safety Related water system. Callaway was the first Nuclear Power plant to obtain NRC approval and successfully place the HDPE piping system into...
2016 Berlin : A proposed procedure for PVC pipe temperature de-rating in north America
Author(s) : Steven Folkman, Ron Bishop
There are guidelines in AWWA standards for de-rating a PVC pipe’s pressure class if the operating temperature exceeds 23°C. These de-rating factors are appropriate for a system operated at a constant elevated temperature. In the warm desert climates in the USA it is common for the water mains to exceed room...
2016 Berlin : Mechanical stabilization of rigid PVC compositions
Author(s) : Thomas C. Pedersen, Robert R. Kwapisz
This paper presents rheological data on simple rigid PVC compositions lubricated paraffin wax, calcium stearate, and oxidized polyethylene wax. These three materials comprise the most widely used lubricant system for rigid PVC in North America. The influence of certain paraffin wax characteristics will be discussed....
2016 Berlin : Potentials of terahertz technology for the inspection of plastic pipes
Author(s) : Stefan Kremling, Thomas Hochrein, Peter Heidemeyer
In plastics industry, the use of terahertz technology opens up opportunities for novel non-destructive and contactless testing applications. For example, the thickness of individual layers of a foamed multilayered plastic pipe can be monitored contactless and continuously during the extrusion process. Furthermore,...
2014 Chicago : 150 Years Lifetime on PE-Piping Systems for Drinking Water, Can It Be Achieved?
Author(s) : Tomas Helenius, Karin Jacobson, Thomas Blomfeldt
Polyethylene is the leading material for new installation of drinking water pipes in Sweden. The material is recognized by the market as a flexible, light weight and an inexpensive solution. The material is ideal for water piping, however the lifetime is only guaranteed for 50 years. This is a problematic limitation...