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Case Study Application Of Determining End Of Asset Physical Life Using Survival Analysis:(WERF Report INFR2R11a)
Citation:
Rose, D., S. Iyer, D. Jeong, AND D. Marlow. Case Study Application Of Determining End Of Asset Physical Life Using Survival Analysis:(WERF Report INFR2R11a). Water Environment Research Foundation, Alexandria, VA, 2015.
Impact/Purpose:
Benefits: This case study (INR2R11a) report provides discussion on an application to water and wastewater pipes in Cincinnati of selected advanced concepts included in the End of Asset Life (EOAL) Reinvestment decision-making process tool, which: • Provides step-by-step process guidance to the asset management practitioner in making the cyclical transitional decisions between maintenance, operations and capital with a particular focus on the transition to capital reinvestment. • Assists the asset manager in determining which renewal strategy (maintenance/repair, refurbishment, replacement) is most cost effective and when in the life cycle of a given asset to transition from an operations and maintenance strategy to a capital reinvestment (renewal) strategy given a set of user established baseline conditions and assumptions.
Description:
Abstract:This case study application provides discussion on a selected application of advanced concepts, included in the End of Asset Life Reinvestment decision-making process tool, using a utility practitioner’s data set. The tool provides step-by-step process guidance to the asset management practitioner in making the cyclical transitional decisions between maintenance,operations, and capital with a particular focus on the transition to capital reinvestment. An application test team consisting of approximately 15 key utility staff and four tool developers (consultants/academics) was formed to review application of the tool. The City of Cincinnati volunteered to test the logic and application of the tool on selected water and wastewater pipes. Water pipe data was provided by the Greater Cincinnati Water Works (GCWW), while sewer pipe data was supplied by the Metropolitan Sewer District of Greater Cincinnati (MSD). Senior staff from the United States Environmental Protection Agency and the Water Environment Research Foundation joined the two-day application test team in applying the tool to Cincinnati’s data and business practices. The focus of the application of the tool was more on the usefulness of the decision logic rather than on data mechanics; while every step and task of the tool was “workshopped” with the application team over the two-day period, due to time and financial data constraints the hands-on application of the tool in the workshop invested more in introducing and testing the viability of the advanced concepts to determine the end of physical life (determining the end of service level/capacity life and the end of economic life were also carefully illustrated and reviewed, but no actual utility data were applied).Chapter 1.0 provides an overview of the tool. The final chapter reports the assessment results of the tool by workshop participants. The other chapters discuss the advanced method in determining the end of physical life – survival rate of a pipe at a specific age using the survival analysis method. [NOTE: The link below connects to a WERF site where the Final Report can be downloaded for free, after registering at the WERF site. For some projects the Executive Summary is available and can be downloaded for free without registering on the WERF site.]
