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For Malaysia water operator, NRW leak detection program recognized as major success
At Singapore International Water Week 2016, one of Pure`s licencees presented a poster on two acoustic-based technologies (tethered Sahara® and free-swimming SmartBall®) used to locate 674 leaks on large-diameter trunk mains operated by this Malaysia water operator.
Asset management for sewer systems
Traditional methods of wastewater condition assessment focuses almost exclusively on the gravity system and valve actuation, using tools such as smoke testing, CCTV, and zoom cameras. While effective on gravity mains and valves, these methods are not applicable in force mains. Inspecting force mains is more challenging due to lack of redundancy, lack of access points, cost, technology limitations, while the consequence of force main failures can be significant financially, environmentally and socially.
What’s in the numbers? Analysis of 400 miles of force main inspection and condition assessment data
Comprehensive condition assessment of wastewater force mains provides significant challenges to owners/operators of collection systems as the ability to shut down or expose the pipeline for a thorough inspection is often impractical due to operational and/or financial considerations. Traditional gravity sewer inspection techniques (i.e. visual based technologies) do not always transfer easily to their wastewater pressure pipe counterparts and visual assessments do not provide the structural condition of force main – something that is critical in determining the true pipe condition. Therefore, a different set of inspection tools and assessment techniques is required for force mains.
Numbers don’t lie: PCCP performance and deterioration based on a decade of condition assessment data
Since the late 1990s there have been numerous inspection and monitoring projects focused on identifying and quantifying wire break damage in PCCP water and wastewater pressure mains.
Failure risk of bar-wrapped pipe with broken bars and corroded cylinder
This study investigates the behavior of a deteriorating BWP under various levels of distress and various internal pressures. The results based on a 24-inch pipe transmission main, are used to define criteria to evaluate the performance of a damaged BWP. Based upon the finite element results obtained in this study, suggestions for future work are presented and discussed.
Liability for damage due to water main breaks or leaks
The topics of liability and negligence as they relate to water main failures are discussed from both a historical and current viewpoint. The historical perspective is provided in a 1948 Journal AWWA article, and we consider changes in liability issues from that time to the present. Case studies from various states are also presented that will provide water utilities insights into sovereign immunity and what constitutes discretionary function.
Beyond the wires: a sustainable approach to prestressed concrete cylinder pipe management
While evaluating wire breaks are an important part of PCCP management, it is important to acknowledge additional factors beyond wire breaks. By acknowledging additional condition factors, limitations of wire break assessment, and considering other rehabilitation approaches, there may be a more sustainable PCCP management approach (or combination of approaches).
Pipeline condition assessment. The essential engineering step in asset management
Condition assessment is a critical step in the asset management process. It is the point at which problems and challenges are understood and crystallize into definite plans,both operational and financial. This paper will describe the condition assessment process and its role within asset management. It will also describe the key elements in the condition assessment process and how they achieve the purpose of the assessment. This will include risk assessment, document and records review, physical inspection and finally distilling and interpreting all the data to make an assessment. This serves as a platform for all subsequent management decisions. The author will draw on examples of condition assessment projects in which he has been involved around the world.