A Strategic Decision-Making Framework for CIPP Liner Evaluation: OC San Sewer Rehabilitation

A significant proportion of sewer pipelines across the United States were installed during the early to mid-20th century, and many of these pipelines that are still in service have exceeded their intended design lifespan. Consequently, the need for pipeline rehabilitation or renewal is imperative for continued and reliable service. Given the recent adoption and adaptation of new design standards and manuals of practice, coupled with the limited widespread implementation of these methods, this study presents our systematic approach to selecting appropriate rehabilitation options. Specifically, this paper explores the two distinct approaches for designing a Cured-in-Place Pipe (CIPP) liner, utilizing ASCE Manual of Practice 145 and ASTM F1216. This paper introduces a reliable approach utilizing a weighted scoring matrix to evaluate and rank each method objectively. The matrix enables prioritization against a predefined set of evaluation criteria that are standardized. Each criterion description has been meticulously crafted to establish a foundation for rating parameters spanning from the least favorable condition to the most favorable condition. This systematic rating system has been methodically applied to both ASTM and ASCE methodologies for evaluating CIPP liners. The outcome of this study illustrates a comprehensive and holistic methodology for choosing the most suitable rehabilitation approach. This structured approach empowers infrastructure owners and engineering professionals to make well-informed decisions when it comes to selecting the optimal rehabilitation method. This paper, therefore, contributes to enhancing the decision-making process for sewer pipeline rehabilitation, ultimately leading to improved infrastructure management and longevity.