Guidelines to Minimize Downtime During Pipe Lining Operations
Guidelines to Minimize Downtime During Pipe Lining Operations

Author: Thomas D. Rockaway

Publisher: American Water Works Association

Published: 2007

Total Pages: 164

ISBN-13: 1583215441

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This report provides best utility practices to minimize downtime during pipe lining operations. "Downtime" refers to not only the amount of time customers are without water service, but also the amount of time customers must rely on temporary service, endure restricted service, or are served by less secure networks. The report reviews pipe lining procedures in current use by water utilities and identifies those that improve efficiency and reduce costs.

Water, Wastewater, and Stormwater Infrastructure Management
Water, Wastewater, and Stormwater Infrastructure Management

Author: Neil S. Grigg

Publisher: CRC Press

Published: 2012-06-08

Total Pages: 365

ISBN-13: 1439881847

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Urban water services are building blocks for healthy cities, and they require complex and expensive infrastructure systems. Most of the infrastructure is out of sight and tends to be taken for granted, but an infrastructure financing crisis looms in the United States because the systems are aging and falling behind on maintenance. A road map for pu

External Corrosion and Corrosion Control of Buried Water Mains
External Corrosion and Corrosion Control of Buried Water Mains

Author: Andrew E. Romer

Publisher: American Water Works Association

Published: 2004

Total Pages: 188

ISBN-13: 9781583213476

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Water utilities often do not know the specific cause of external corrosion observed on their water mains, and consequently, the chosen preventative measure may not work effectively. Historically, these choices are based on data from other industries (e.g., gas and oil) and may not be suitable for the water industry. Corrosion of metallic pipes can be caused by a variety of mechanisms, each of which requires a different solution. Determining which corrosion mechanism is at work is not a simple matter, because the resulting pipe damage looks similar for all of them. The failure to properly identify corrosion sources may produce prevention systems that are ineffective or do not last. For example, it is not effective to install an anode bag on a main that has a bacteriological corrosion problem. Similarly, an anode bag installed to reduce corrosion caused by a stray impressed current would be quickly used up and would provide only short-term protection. Much recent research on corrosion has focused on internal corrosion, primarily related to water-quality issues, such as lead and copper control and red water. This project will examine external corrosion, which affects the structural integrity of the pipe and makes it vulnerable to leaks and breakage. After identifying the causes of external corrosion, the study will find economical solutions for each type of corrosion and verify them through field trials.

Deterioration and Optimal Rehabilitation Modelling for Urban Water Distribution Systems
Deterioration and Optimal Rehabilitation Modelling for Urban Water Distribution Systems

Author: Yi Zhou

Publisher: CRC Press

Published: 2018-05-03

Total Pages: 249

ISBN-13: 0429837771

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Pipe failures in water distribution systems can have a serious impact and hence it’s important to maintain the condition and integrity of the distribution system. This book presents a whole-life cost optimisation model for the rehabilitation of water distribution systems. It combines a pipe breakage number prediction model with a pipe criticality assessment model, which enables the creation of a well-constructed and more tightly constrained optimisation model. The pipe breakage number prediction model combines information on the physical characteristics of the pipes with historical information on breakage and failure rates. A weighted multiple nonlinear regression analysis is applied to describe the condition of different pipe groups. The criticality assessment model combines a pipe’s condition with its hydraulic significance through a modified TOPSIS. This model enables the optimisation to focus its efforts on those important pipes. The whole life cost optimal rehabilitation model is a multiple-objective and multiple-stage model, which provides a suite of rehabilitation decisions that minimise the whole life cost while maximising its long-term performance. The optimisation model is solved using a modified NSGA-II. The utility of the developed models is that it allows decision makers to prioritize their rehabilitation strategy in a proactive and cost-effective manner.

Reliability and Maintainability of In-Service Pipelines
Reliability and Maintainability of In-Service Pipelines

Author: Mojtaba Mahmoodian

Publisher: Gulf Professional Publishing

Published: 2018-06-13

Total Pages: 188

ISBN-13: 0128135794

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Reliability and Maintainability of In-Service Pipelines helps engineers understand the best structural analysis methods and more accurately predict the life of their pipeline assets. Expanded to cover real case studies from oil and gas, sewer and water pipes, this reference also explains inline inspection and how the practice influences reliability analysis, along with various reliability models beyond the well-known Monte Carlo method. Encompassing both numerical and analytical methods in structural reliability analysis, this book gives engineers a stronger point of reference covering both pipeline maintenance and monitoring techniques in a single resource. - Provides tactics on cost-effective pipeline integrity management decisions and strategy for a variety of different pipes - Presents readers with rational tools for strengthening and rehabing existing pipelines - Teaches how to optimize materials selection and design parameters for designing future pipelines with a longer service life