Lack of Condition Assessment Protocols

1277 Words6 Pages
1.4.2 Lack of Condition Assessment Protocols Based on a survey of twenty-four North American sewer agencies using condition assessment protocols, Rahman and Vanier (2004) identified the lack of consistent, standard condition assessment protocols as a critical gap. The survey results showed 68% of the respondents used a protocol based on that of the National Water Research Council. The biggest gaps identified were systematic collection of data and use of formal risk assessment methods to prioritize resources for maintenance and rehabilitation activities. 1.4.3 Lack of understanding about capabilities and limitations of technologies There is a gamut of technologies available for assessing the condition of water and wastewater pipelines, but more than often utility managers are ill-informed about their capabilities and limitations. The lack of knowledge with technology providers about their technologies also adds to the gap in knowledge. e.g., in case of acoustic fiber optic sensors, technology providers claim that the technology is capable of detecting and identifying all type of acoustic signals in the close proximity of pipes. But, more than often, false alarms are experienced by utility managers. In order to address this issue a case study was developed to investigate the existing gap in knowledge. The case study is presented in Chapter 5, which identifies the need of advanced signal processing to better understand the capabilities and limitations of acoustic fiber optic technology. This case study thus proves the lack of understanding about the capabilities and limitation of condition assessment technologies at present. 1.5 Problem Statement At present very few technologies like CCTV survey, Ultrasonic Inspection, etc. hav... ... middle of paper ... ...ese parameters in calculating the various indices. Last, the chapter explains the process for calculating performance and economical indices on the basis of the information collected from the users of CAST. Chapter 5 presents a case study on Acoustic Fiber Optic Sensor Systems (FOSS). It begins with a brief overview of Prestressed Cylinder Concrete Pipelines, Modes of Failure and Mechanisms and FOSS technology. It then briefly introduces a concept of Acoustic Emission based condition assessment technologies, signal features and signal processing methods. Next, it reviews the data collection and analysis of these signals to identify the underlying, unexplored potential of FOSS to monitor the structural performance of the pipes. Chapter 6 presents a summary of the research, an evaluation of CAST, a scope for future research and a dissemination of CAST to the users.
Open Document