Mechanical-Based Approach for Operational Risk Evaluation of Water Mains in Shanghai

A mechanical-based approach was applied in this study to evaluate the operational risk of water mains in the Shanghai region. First, a pipeline's structural performance in terms of stress indicators and structural failure criteria were determined by the mechanical-based approach. Second, a comprehensive parametric study was carried out to evaluate the variation of operational risk of water mains at different periods. Finally, the evolving operational risk of water mains in the Shanghai region was evaluated. The accuracy and applicability of the mechanical-based approach were validated by reviewing recorded accidents. According to the investigation, the mechanical-based approach is an efficient method to evaluate the operational risk of water mains. The operational risk level of water mains grows with increasing exposure due to corrosion of wall thickness. In applications, the mechanical-based approach can be extended as an early warning system for city officials to improve day-to-day operational conditions. Consequently, an appropriate maintenance scheme can be designed to make the rehabilitation of the entire water supply network economical.