Plastic Pipes Conference Association # 2023 Lake Buena Vista
Aisha Khaleel, Suleyman Deveci, Sulistiyanto Nugroho, Fatima AlHameli
The use of polyethylene pipes in transportation networks of pressurized water and gas have shown superb performance over the history. High density, high-molecular-weight, and bi-modal polyethylene materials, known as PE80, PE100 and PE100RC, have successfully served the market for many years in standard applications. High density Polyethylene pipes performance requirement with regards to hydrostatic pressure and slow crack growth (SCG) resistance have been defined in application-related product specifications. Notched pipe test (NPT) according to ISO 13479, originally developed by Allwood and Beach, is one of the most common and industry accepted SCG test method. In this test, a plastic pipe with four axial predefined notches at the outer surface around its circumference is subjected to hydrostatic pressure in a water bath at 80 °C. Following a recent international round robin study, it was proposed to have a control on notch radius by setting a maximum limit to improve reproducibility of the NPT method. In this study we present a method to measure and quantify the notch radius, which is used to investigate the effect of notch radius on the failure time of NPT. Identical pipes were notched with five different notch radiuses and tested until failure to develop a correlation between notch radius and failure hours. Brittle fracture depth of each notch is measured together with microscopic analyses of fracture surfaces. The outcome of this work is expected to help the revision of ISO 13479 and improve the reproducibility of the test method.
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