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Title: High Performance Bimodal Pe 100 Materials For Gas Piping Applications
Author: Gene Palermo
Source: American Gas Association 2005
Year Published: 2005
Abstract: This paper describes the key features of high performance bimodal PE 100 materials, which have a unique combination of the highest pressure rating for a PE material, outstanding resistance to SCG (slow crack growth) and outstanding resistance to RCP (rapid crack propagation). We will review the higher pressure rating of PE 100 materials obtained from ISO 9080 and ISO 12162 called the MRS (minimum required strength) and compare it to the North American pressure rating method called the HDB (hydrostatic design basis) obtained from ASTM D 2837. We will then review the changes that the Plastics Pipe Institute (PPI) members are making to several ASTM standards so that these PE 100 materials can achieve the same higher pressure ratings of the ISO method using ASTM standards. The new pipe material designation code for these PE 100 materials using the new ASTM terminology will be PE 4610. Finally, we will show that the pipe cost for the traditional PE materials (PE 2406 and PE 3408) is actually higher than the new high performance PE 4610 materials. These high performance PE 100 materials rated using the ISO method not only have all the benefits we will describe, but they also have the lowest cost.

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