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Abstract
The 100 year stress crack resistance of corrugated high density polyethylene (HDPE) pipes was evaluated using a 600 mm diameter pipe. The stress crack resistance (SCR) tests were performed on the finished pipe at the liner and junction locations. The notched constant ligament stress test was used for the pipe liner assessment. For the pipe junction, a new method was developed to assess the effects of the liner corrugation join geometry. The test media was water at different elevated temperatures to accelerate crack growth rate. Two extrapolation methods, Popelar's shift method and the rate processing method (RPM), were examined by comparing the predicted curve with experimental data. The results indicate that the RPM is a more reliable method, and has been adopted to perform the failure time prediction at 23°C. The predicted time was found to exceed 100 years at the stress level of 3·4 MPa. Based on the test results, specification for 100 year stress crack resistance of corrugated HDPE pipes was established.