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...
2014 Chicago : Validation of the Long Life of PVC Pipes
Author(s) : Steven Folkman
Several analytical studies have estimated that PVC pipe can have a useful life of over 100 years. The earliest widespread use of PVC pipes was in Germany in the late 1930’s. These early pipes lacked proper extrusion technology. Extrusion technology was greatly developed during the 1950’s and 1960’s. Use of PVC pipe in...
2012 Barcelona : Accelerated material testing with cyclic CRB tests
Author(s) : Andreas Frank, Anita Redhead, Thomas Kratochvilla, Heinz Dragaun, Gerald Pinter
Key words : Polyethylene, pipe, test method, lifetime, slow crack growth For a qualitative characterization of the slow crack growth resistance of polyethylene pipe grades several test methods are available. Especially for modern pipe grades these test methods exceed practical time frames and new acceleration methods...
2012 Barcelona : Polyethylene pipes: PE water pipes and chlorinated disinfectants: a pragmatic approach to even safer solutions
Author(s) : Francis R. Costa, Christophe Salles, Anh Tuan Tran, Jeroen Oderkerk and Thomas Hjertberg
Over the years polyethylene has gained preference as the material of choice for
water distribution pipes due to its long successful track record offering comparatively
lower frequency of leakage, corrosion resistance, flexibility, light weight, easy
installation, etc. However, in recent years, there have been growing...