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Title: Increasing Importance Of Rapid Crack Propagation Rcp() For Gas Piping Applications - Industry Status
Author: Gene Palermo, Dane Chang
Source: American Gas Association 2010
Year Published: 2010
Abstract: Polyethylene (PE) is the primary material used for gas piping applications. Because of its flexibility, ease of joining and long-term durability, along with lower installed cost and lack of corrosion, gas companies want to install PE pipe instead of steel pipe in larger diameters and higher pressures. As a result, rapid crack propagation (RCP) is becoming a more important property of PE materials. This paper will review the two key ISO test methods that are used to determine RCP performance (full scale test and small scale steady state test), and compare the values obtained with various PE materials on a generic basis. The RCP performance in these test methods is significantly superior for both bimodal PE 2708 and bimodal PE 4710 compared to the unimodal materials. We will also review the status of RCP requirements in industry standards such as ISO 4437, ASTM D 2513 and CSA B137.4. In addition, we will review progress within CSA Z662 Clause 12 and the AGA Plastic Materials Committee to develop industry guidelines based on the values obtained in the RCP tests to design against an RCP incident. Finally, we will discuss how the superior RCP performance of bimodal PE 2708 and bimodal PE 4710 materials has led to a higher 0.45 design factor for gas applications in Canada. These materials are marked PE 2708 PLUS and PE 4710 PLUS to indicate they can use the 0.45 design factor.

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