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Title: The Dependence Of Small Scale Steady State (S4) Critical Pressure On Pipe Geometry
Author: Mark Lamborn, Bryan Hauger
Source: American Gas Association 2005
Year Published: 2005
Abstract: Crack growth analysis is used to investigate the specimen geometry dependence of the critical pressure test results provided by the small-scale steady-state (S4) test. This study demonstrates that S4 critical pressure is indeed dependent on the pipe diameter and standard dimension ratio (SDR), as anticipated. Stated another way, S4 critical pressure does not specifically characterize the rapid crack propagation (RCP) resistance of the pipe resin. Rather, S4 critical pressure characterizes the RCP resistance of the pipe. An understanding of this geometry dependence is important, as it provides the basis for the efficient selection of pipe sizes for S4 critical pressure tests, as well as interpretation of S4 test results. Comparison of measured and predicted critical pressure results demonstrate that the crack growth analysis can be used to conservatively estimate the critical pressures for specific pipe geometries.

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