Analysis on Service Life of Ductile Cast Iron Pipes Wrapped in Polyethylene Sleeves

Abstract

 This paper conducted an analysis of the service life of ductile cast iron pipes wrapped in polyethylene sleeves. In a previous study, focused on the pitting corrosion that occurs on the outer sur-face of ductile cast iron pipes due to aging, and attempted to analyze the prediction of water pipe deterioration. Using the pitting corrosion depth prediction formula, we calculated the service life of pipes that are not wrapped in polyethylene sleeves. However, for pipes wrapped in polyethylene sleeve, there remained problems in applying the pitting corrosion depth prediction formula, such as large variations in data. Therefore, adding the latest data, reexamined the pitting corrosion depth prediction formula, and conducted multiple analyzes using physical property test results, etc., and attempted to reexamine the service life with polyethylene sleeves encasement . As a result, analysis of measured data confirmed that polyethylene sleeves encasement can extend the service life by at least 20 to 40 years.