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Fracture & Resistance # 1992 Eindhoven
This paper outlines a theoretical approach developed to quantify the conditions for a long-running crack in PE gas distribution pipes. Comparisons with a full-scale experiment on a 250 mm diameter SDR 17.6 MDPE pipe are made to demonstrate the validity of the model. The present status of a user-oriented procedure to prevent rapid crack propagation in PE gas pipes is described.
Author(s) : Mel Kanninen, Kyle Bethel and Aron Ekelund
It is well known that gas permeation in thermoplastic pipe is proportional to pressure. Accordingly, quantitative consideration must be given to this phenomenon to properly design and operate reinforced thermoplastic composite pipe (RTCP) in high pressure applications. In this paper a permeation predictive model based...
Author(s) : Grigory, Kim, Kanninen, O'Donoghue, Mamo
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) : Grigory, O'Donoghue, Mamoun
Measurements of temperature, power input, and pressure of the molten PE at the pipe-coupling interface in 4-, 6-, and 8-inch (1 14-, 168- and 219-rnm)' electrofusion (EF) couplings were made using instrumented experiments during the fusion cycle. The high temperature properties of several medium and high density...
Author(s) : Kanninen, Buczala, Kuhlman, Green, Grigory, O'Donoghue, McCarth
Most current procedures for the design, installation and qualification of electrofused jointsin polyethylene gas piping systems are empirical in nature. To improve this situation, the Gas Research Institute initiated an integrated experimental and analysis research program at the Southwest Research Institute. The...
Author(s) : Kuhlmann, Kanninen, Tweedy
Accelerated slow crack growth testing procedures that are coupled with newly developed bi-directional time-temperature shifting functions can provide reliable fracture mechanics based forecasts of long-term service performance of polyethylene gas distribution pipes. This methodology is first reviewed, then used in...
