Determination of Optimal Rehabilitation Time for Types of Cast Iron Pipes of Small Pipe Diameter on Water Distribution System in Metropolitan

2003 ◽  
Author(s):  
Won-Sik Chung ◽  
Myong-Jin Yu ◽  
Ja-Yong Koo ◽  
I-Tae Kim ◽  
Hyun-Dong Lee
Keyword(s):  
Cast Iron ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Pipe Diameter ◽  
Optimal Rehabilitation ◽  
Rehabilitation Time

scholarly journals Effects of disinfectant and biofilm on the corrosion of cast iron pipes in a reclaimed water distribution system

2012 ◽  
Vol 46 (4) ◽  
pp. 1070-1078 ◽  
Author(s):  
Haibo Wang ◽  
Chun Hu ◽  
Xuexiang Hu ◽  
Min Yang ◽  
Jiuhui Qu
Keyword(s):  
Cast Iron ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Reclaimed Water

scholarly journals Ranking Approach to Scheduling Repairs of a Water Distribution System for the Post-Disaster Response and Restoration Service

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1591 ◽  
Author(s):  
Bałut ◽  
Brodziak ◽  
Bylka ◽  
Zakrzewski
Keyword(s):  
Distribution System ◽  
Disaster Response ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution System ◽  
Preference Ranking ◽  
Task List ◽  
Sequencing Method ◽  
Post Disaster

: On the maintenance task list of each water distribution system (WDS) operator, determination of the order of undertaken repairs seems quite a typical task. Characteristics of damages, their localization, and other factors that influence repair sequencing have a sound impact on the execution of such tasks. In the case of the most complex cases where numerous failures of different types occur at the very same time (i.e., due to earthquakes), there is a long list of selection criteria that have to be analyzed to deliver an objectively logical schedule for repair teams. In this article, authors attempt to find out if it is possible to define pipe rankings in having obtained the best factors for defined objective functions (criteria), making it feasible to deliver judicious repair sequencing. For the purposes of this paper, a survey has been carried out. Its conclusions made it possible to propose a method to create rankings of pipes and evaluate them using a selected multicriteria decision method: preference ranking organization method for enrichment evaluation (PROMETHEE). The work was carried out for five different disaster scenarios that had been supplied by ‘The Battle of Post-Disaster Response and Restoration’ organization committee. Obtained results might be further used to finetune this sequencing method of undertaken repairs, while conclusions could be useful to model similar events in WDS when required. This article is an extended paper based on the conference preprint presented at the 1st International Water Distribution Systems Analysis (WDSA)/International Computing & Control for the Water Industry (CCWI) Joint Conference in July 23–25, 2018 in Kingston, Ontario, Canada.

Determination of cast iron pipe wall decay coefficient for combined chlorine in a municipal water distribution system

2015 ◽  
Vol 42 (4) ◽  
pp. 250-258 ◽  
Author(s):  
Megan J. Liu ◽  
Stephen Craik ◽  
David Z. Zhu
Keyword(s):  
Water Quality ◽  
Cast Iron ◽  
Distribution System ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution System ◽  
Water Quality Model ◽  
Quality Model ◽  
Decay Coefficient ◽  
Municipal Water

Predicting disinfectant concentrations in water distribution systems using water quality models requires the input of the wall decay coefficient of the disinfectant. In this study, field water sampling data was integrated with network hydraulic and water quality model simulations of a section of the municipal water distribution system in the City of Edmonton, composed of predominantly cast iron piping, to determine a wall decay coefficient for combined chlorine (chloramine). Unique combined chlorine wall decay coefficients that provided the best fit of model-predicted chlorine concentrations to the field data were determined at two temperatures. Using the determined wall decay coefficients, the water quality model can be used to predict combined chlorine concentrations.

scholarly journals Modeling and Optimization of Potable Water Network

2000 ◽  
Author(s):  
Berge Djebedjian ◽  
Ahmed Herrick ◽  
Magdy Abou Rayan
Keyword(s):  
System Design ◽  
Distribution System ◽  
Water Distribution ◽  
Potable Water ◽  
Water Distribution System ◽  
Optimization Technique ◽  
Unconstrained Minimization ◽  
Pipe Diameter ◽  
Water Network ◽  
Minimization Technique

A potable water network hydraulic analysis is presented in this paper. A mathematical model was developed, the model treats looped network. A computer program is developed in order to facilitate water distribution system design, which satisfies all constraints including pipe diameter and nodal pressure. An optimization technique is developed in order to evaluate the optimum network configuration and cost, the parameters are pipe diameter, flow rate, corresponding pressure and hydraulic losses. A non-linear technique was adopted in the solution. The model uses the sequential unconstrained minimization technique (SUMT) of Fiacco and McCormick (1964) to solve the optimal design of network. The adopted optimization technique decreases the required number of design iterations which for example may reach 1.48 billion iterations for a network with 8 pipes and a set of 14 available commercial pipes. The initially assumed pipe diameters are successively adjusted to suit the existing standard commercial pipe diameters. The technique was applied on a simple case study of gravity-fed network. The objective of the present investigation is to present a practical tool to help in the optimization of water distribution system, design and operation.

Variations regularity of microorganisms and corrosion of cast iron in water distribution system

2018 ◽  
Vol 74 ◽  
pp. 177-185 ◽  
Author(s):  
Wei Qiu ◽  
Weiyu Li ◽  
Junguo He ◽  
Hongyu Zhao ◽  
Xiuming Liu ◽  
...  
Keyword(s):  
Cast Iron ◽  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System
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