Utilization of Notched Ring Test for larger diameter pipes and fittings

Author(s) : J.D. Kim, S. Kim , T. Schmutz, C. Malchaire, D. Scholz, K. Keck 2018 Las-Vegas

Since a few years, pipe producers are facing the challenge to protect their plastic pipe from degradation due to chlorine dioxide. Unfortunately, most existing stabilization solutions are not effective enough to insure the desired lifetime of the material. This study shows how the latest development allow to top-up...

Author(s) : Sunwoong Choi, Tom Marti 2016 Berlin

Small scale, steady state (S4) testing per ISO 13477 is a lab-based procedure to determine the critical pressure at which a fracture will propagate following initiation in a given pipe material filled with a given test medium. The S4 test was originally developed for the natural gas industry using air as the test...

Author(s) : Kim Endsley, Joseph Poniatowski 2016 Berlin

In order to free itself from the rising costs of water supplied by the Detroit Water and Sewerage Department, the Karegnondi Water Authority proposed a new water intake and delivery system from Lake Huron to Flint, Michigan. Because of the recent introduction of the zebra mussel into North America’s Great Lakes, a...

Author(s) : Juseok OHa, Youngjin Ohb, Seunggun Leeb, Jongsung Kimc, and Sunwoong Choia 2012 Barcelona

Butt fusion welding is a method of joining often practiced in structural plastic pipes used in pressure applications, where joint integrity is a strict requirement for design lifetime of fifty or more years. The fusion process encompasses melt flow and rheology as well as diffusion and solidification sciences in which...

Author(s) : Pyo, Seo, Mutter, Broutman, Choi 2006 Washington DC

A novel Notched Ring Test (NRT) method for measuring slow crack growth (SCG) in plastics pipes and fittings is developed and applied to determine its applicability as the standard test method. NRT specimen in the form of a notched full ring, directly obtained from the extruded pipe or injection molded fitting...

Author(s) : Chung, Couch, Kim, Vibien, Oliphant 2004 Milan

Environmental factors are known to significantly impact the oxidative failure mechanism of materials. For example, the chlorine present in potable water as a disinfectant is an oxidant that has been reported to impact the failure mechanism of materials in potable water applications. In this paper, the relationship...

Author(s) : Edwards, Broutman, Choi 2001 Munich

The Alternate Methods Committee of the Plastics Pipe Institute’s Hydrostatic Stress Board (HSB) has completed development of an alternate method for determining the hydrostatic design basis (HDB) for plastic piping materials. The initial work was reported at Plastic Pipes X, in Sweden in 1998.1 An ASTM test method...

Author(s) : Choi, Lee, Broutman, Edwards, Palermo, Cho, Choi, Park 2001 Munich

In recently designated plane strain grooved tensile (PSGT) methodology of ASTM F2018 standard, a groove in the direction perpendicular to the loading axis allows biaxial stress state to be generated under a uniaxial loading. The biaxial stress state produced very closely approximates the internally pressurized pipes...

Author(s) : Grigory, Kim, Kanninen, O'Donoghue, Mamo 1995 Edinburgh

The perceived need to ensure that polyethylene gas distribution pipes are safe from the possibility of long running catastrophic cracks has prompted a significant level of research recently. This paper brings to a completion an ongoing effort by the authors and their colleagues over the last few years. The...

Author(s) : Choi 1995 Edinburgh

A plane strain specimen has been developed which creates a biaxial stress state when loaded in uniaxial tension. A detailed stress analysis of this specimen is presented. The stress state was generated though the use of a groove across the width of the specimen. Both theoretical and experimental results are presented....