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Title: Evaluation Of Squeeze-Off Procedure For The Control Of Gas Flow In Polyethylene Pipe
Author: Michael J. Cassady
Source: American Gas Association 1988
Year Published: 1988
Abstract: The research program to evaluate the squeeze-off procedure in polyethylene pipe is composed of three phases: Phase I-test selection, Phase II - screening tests to identify critical variables, and Phase III - focused testing of variables selected. The results of Phase I and part of Phase II were presented at the 10th Plastic Fuel Gas Pipe Symposium in October 1987. This paper presents an update of that work, including the results of the initial focused testing of the critical process variables. The results reported here include: (1) selection of the stress-rupture test using 1-percent Igepal-water solution as the test most sensitive to squeeze-off damage, (2) identification of percent squeeze and rerounding as the process variables most affecting material performance, and (3) preliminary focused test results for one material indicating an interaction between the two process variables selected.

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