2014 Chicago : An Assessment of the Approach to Validate Polyethylene Pipe in Potable Water Systems
Author(s) : Dr. Ken Oliphant, Patrick Vibien, Dr. Michael Conrad, Sarah Chung
A new methodology has been developed to validate the performance of polyethylene piping materials in potable water applications. The methodology is based on several research programs which examined a standardized accelerated test methodology (ASTM F2263 Standard Test Method for Evaluating the Oxidative Resistance of...
2006 Washington DC : Rapid Crack Propagation in Loosely Fitted PE Liner Pipe
Author(s) : Leevers, Henderson, Pereira
Laboratory-scale S4 tests have been used to determine whether it would be possible, at any
realistic working pressure, for a loosely-fitted PE liner within a rigid host pipe to fail by
Rapid Crack Propagation (RCP). The standard ISO 13477 S4 method was modified by
replacement of the containment ring cage by a rigid,...
2006 Washington DC : S4 Critical Pressure and Critical Temperature
Author(s) : Maeger, Vanspeybroeck, Lamborn, Mamoun, Leevers, Oliphant
As polyethylene pressure pipes enter the global marketplace under an ever-wider range of
operating conditions, there is increasing emphasis on their rapid crack propagation
performance. It is important that both producers and end-users are able to rely on the
robustness of the rapid crack propagation test results and...
2004 Milan : S4 critical temperature tests: procedure and interpretation
Author(s) : Patrick Leevers
International Standard ISO 13477 defines the ‘S4’ RCP test itself, and specifies two
procedures which use it. The first procedure, already well embedded in referring standards,
evaluates a critical pressure at constant temperature (usually 0°C) below which RCP arrests.
The second procedure evaluates, at constant...
2001 Munich : Fully Predictive Model of RCP in Plastics Pipes
Author(s) : Ivankovic, Tropsa, Jasak, Leevers
This work presents a 3D coupled solid-fluid model for predicting fast failures in pressurised
plastic pipes. It is developed within a unified computational procedure where both solid
pipe and pressurising media are discretised using the Finite Volume method. The coupling
is achieved across the pipe-fluid interface...
2001 Munich : The Ductile-Brittle Transition in Pipe-Grade PE
Author(s) : Leevers, Moreno, Paizis
The resistance of PE pipes to rapid crack propagation depends strongly on temperature.
The critical pressure measured using ISO 13477 ‘S4’ tests increases abruptly above a
transition temperature Tc. For PE100 grades Tc has become a primary index of quality : it
must remain below 0°C despite a tendency to increase...
1998 Gothenburg : Ductile deformation in Pipe Grade PE
Author(s) : Hillmansen, Davis, Leevers
Rapid Crack Propagation in PE-100 gas pipes is governed primarily by a brittle-tough transition temperature
TBT,above which ductile deformation will absorb energy and promptly arrest a fast-running brittle crack. Even at
low temperatures, a layer of plastically deformed material is formed at the pipe bore during...
1998 Gothenburg : Impact Rate and Geometry Effects in Pipe Grade Materials
Author(s) : Douglas, Leevers
A model for dynamic and impact fracture has been recently proposed whereby the fracture event is controlled by adiabatic heating and subsequent melting of the cohesive crack tip craze. The crack initiation resistance is shown to be an inherent function of specimen geometry and impact speed. This theoretical framework...
1998 Gothenburg : Process and Property Interactions in PE Pipelines
Author(s) : Davis, Greenshields, Dabas, Leevers
The study of Rapid Crack Propagation (RCP) in pressurised pipelines is of particular importancr to th? g a
industry, where the possibility of such a failure must he minimised. Polyethylene (PE) currently dominates
the market for plastic gas pipelines, and as the demands for larger diameters .and higher operating...