Quality Analysis of Water Network Failure

Abstract The main objective of the study was to analyse and assess the failure rate of the water supply system of a provincial city located in south-eastern Poland. In the analysis the exploitation data provided by the water supply company were used. The received data include, among others, material structure, age of water supply network and failure log. The failure rate analysis of the water supply network was based on the failure rate index λ [failure/(km∙year)]. Based on the performed analysis, it was found that the water company should consider renovating or replacing steel pipes.

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Modelling of failure rate of water supply network using the Bayes theorem

E3S Web of Conferences ◽

10.1051/e3sconf/20184400175 ◽

2018 ◽

Vol 44 ◽

pp. 00175 ◽

Cited By ~ 2

Author(s):

Dawid Szpak ◽

Barbara Tchórzewska-Cieślak

Keyword(s):

Water Supply ◽

Failure Rate ◽

Bayes Theorem ◽

Probability Of Failure ◽

Technical Condition ◽

Supply Network ◽

Water Supply Network ◽

South Eastern ◽

The Subject ◽

Water Supply Company

The subject of the publication is the analysis and assessment of failure rate of the water supply network in a district city located in south-eastern Poland. The analysis was based on the failure rate index. In addition, the paper uses the Bayes theorem to determine the probability of failure of water supply network. The exploitation data obtained from the water supply company were used in the work. It was found that the water supply network of the analysed city is characterized by good technical condition.

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Seasonality of water supply network failure in the aspect of water supply safety

E3S Web of Conferences ◽

10.1051/e3sconf/20184400140 ◽

2018 ◽

Vol 44 ◽

pp. 00140 ◽

Cited By ~ 2

Author(s):

Izabela Piegdoń ◽

Barbara Tchórzewska-Cieślak

Keyword(s):

Water Supply ◽

Water Supply Systems ◽

System Failure ◽

Supply Network ◽

Water Supply Network ◽

Network Failure ◽

Water Supply Company ◽

Supply Systems ◽

Special Case ◽

Operational Data

Many phenomena are characterized by unevenness and variability in time, so-called periodic fluctuations, of which seasonal variations are a special case. In water supply systems, the failures of water pipes are also characterized by unevenness during the year. Seasonality is especially evident when the failures are analysed at particular times of the year. The main purpose of this paper is to present the problems of failures in water supply network caused by seasonal changes, to determine seasonal indicators and to give an example of the system failure analysis for the selected city of south-eastern Poland. The analysis was based on actual operational data obtained from water supply company.

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Detection and Localization of Water Leaks in Water Nets Supported by an ICT System with Artificial Intelligence Methods as a Way Forward for Smart Cities

Sustainability ◽

10.3390/su11020518 ◽

2019 ◽

Vol 11 (2) ◽

pp. 518 ◽

Cited By ~ 12

Author(s):

Izabela Rojek ◽

Jan Studzinski

Keyword(s):

Water Supply ◽

Smart Cities ◽

Urban Transport ◽

Geographical Information ◽

Material Structure ◽

City Management ◽

Supply Network ◽

Water Losses ◽

Water Supply Network ◽

It Systems

The last decade has seen the development of complex IT systems to support city management, i.e., the creation of so-called intelligent cities. These systems include modules dedicated to particular branches of municipal economy, such as urban transport, heating systems, energy systems, telecommunications, and finally water and sewage management. In turn, with regard to the latter branch, IT systems supporting the management of water supply and sewage networks and sewage treatment plants are being developed. This paper deals with the system concerning the urban water supply network, and in particular, with the subsystem for detecting and locating leakages on the water supply network, including so-called hidden leakages. These leaks cause the greatest water losses in networks, especially in old ones, with a very diverse age and material structure. In the proposed concept of the subsystem consisting of a GIS (Geographical Information System), SCADA (Supervisory Control and Data Acquisition) system and hydraulic model of the water supply network, an algorithm of leak detection and location based on the neural networks’ MLP (multi-layer perceptron) and Kohonen was developed. The algorithm has been tested on the hydraulic models of several municipal water supply networks.

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Bayesian Inference in the Analysis of the Failure Risk of the Water Supply Network

Journal of Konbin ◽

10.2478/jok-2019-0066 ◽

2019 ◽

Vol 49 (3) ◽

pp. 433-450 ◽

Cited By ~ 1

Author(s):

Barbara Tchórzewska-Cieślak ◽

Janusz R. Rak ◽

Dawid Szpak

Keyword(s):

Bayesian Inference ◽

Water Supply ◽

Conditional Probability ◽

Water Distribution ◽

Posteriori Probability ◽

Supply Network ◽

Water Losses ◽

Water Supply Network ◽

A Posteriori Probability ◽

Network Failure

Abstract One of the basic subsystems of the collective water supply system is the water distribution subsystem which has a direct impact on the reliability and safety of water supply to consumers. Failures of water pipes may cause water losses (leaks), interruptions in the water supply to consumers and can be the cause of secondary water pollution in the water supply network. It was proposed to use Bayesian inference to locate failures on the water supply network and to determine a posteriori probability of water network failure. It was found that the conditional probability of distribution water supply network failure is definitely higher than the conditional probability of home connections failure. The research results should be used by the water supply company during the development of an operational strategy for the renovation and modernization of the water supply network.

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Analysis and assessment of water distribution subsystem failure

Journal of Konbin ◽

10.1515/jok-2016-0040 ◽

2016 ◽

Vol 40 (1) ◽

pp. 47-62

Author(s):

Katarzyna Pietrucha-Urbanik ◽

Katarzyna Pociask

Keyword(s):

Water Supply ◽

Failure Rate ◽

Water Distribution ◽

Material Structure ◽

Water Supply Systems ◽

Water Network ◽

Network Failure ◽

Failure Frequency ◽

Key Indicators ◽

Supply Systems

Abstract The aim of the study is to analyse and assess the water supply network failure frequency in last ten years, with particular emphasis on the last year of the analysis. The analysis is based on actual data obtained from the water company. The study contains the analysis of the network failure with division into used material, the type of network and place of failure occurrence. Also the failure rate was calculated. Continuous changes in the age and material structure of the water network cause the need for conducting failure frequency research because data on failure rate are the key indicators for operational policy of water supply systems.

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Research Methodology of Water Network Failure in Terms of Reneval / Metodologia Badania Awaryjności Sieci Wodociągowej w Aspekcie Jej Odnowy

Journal of Konbin ◽

10.1515/jok-2015-0031 ◽

2015 ◽

Vol 33 (1) ◽

pp. 233-242 ◽

Cited By ~ 2

Author(s):

Katarzyna Pietrucha-Urbanik ◽

Barbara Tchórzewska-Cieślak

Keyword(s):

Water Supply ◽

Main Element ◽

Water Services ◽

Supply Network ◽

Water Network ◽

Water Losses ◽

Water Supply Network ◽

Network Failure ◽

Strategic Plans ◽

Quality Water

Abstract The important and crucial issue concerning water supply functioning in terms of conducting failure analysis were discussed. In the work failure indicators, water losses and availability of water services, that define standards of quality water services and their values were determined based on data from exploitation. In order to understand the current situation of water supply infrastructure it is necessary to perform periodic analyzes of water supply network failure, which was proposed in this paper. A detailed analysis of the failure and the water loss of the water supply network should be the main element of the urban management water supply network, particularly in the strategic plans for its modernization.

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Analysis of the Negative Daily Temperatures Influence on the Failure Rate of the Water Supply Network

Resources ◽

10.3390/resources10090089 ◽

2021 ◽

Vol 10 (9) ◽

pp. 89

Author(s):

Jakub Żywiec ◽

Krzysztof Boryczko ◽

Dariusz Kowalski

Keyword(s):

Water Supply ◽

Failure Rate ◽

Critical Infrastructure ◽

Operational Reliability ◽

Daily Temperature ◽

Water Supply Systems ◽

Supply Network ◽

Water Supply Network ◽

Cause Of Failure ◽

The Impact

As a part of the critical infrastructure, water supply systems must be characterized by an appropriate level of operational reliability and safety. One of the threats to this is the failure of the water supply network, influenced by many factors, among which we can distinguish internal factors related to the process of designing, construction and system operation, and external factors related to the impact of the environment. The paper presents the influence of negative daily temperature on the failure rate of the water supply network, taking into account the material of the pipes, their diameters, and the cause of failure. The research was carried out on operational data from the period 2004–2018 from the water supply network in a city located in south-eastern Poland. The relationship between the daily temperature and the failure rate of the water supply system has been shown. As the temperature values drop, the failure rate values increase. The biggest influence of the negative daily temperature on the water supply network failure rate is observed for cast iron pipes. PE and PVC pipes are more resistant to the influence of negative temperatures. The most common cause of failure is corrosion and unsealing of the pipes. Pipes with the diameters of 100, 150, 300, 350, and 400 mm in distribution and main networks turned out to fail most often. These results can be used by water supply companies to limit the influence of factors related to negative daily temperatures on the failure rate of the water supply network.

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A Comparative Study on a Hydraulic and Water-Quality Analysis Method for Determining Rechlorination Injection Points for a Water-Supply Network

Water ◽

10.3390/w11040697 ◽

2019 ◽

Vol 11 (4) ◽

pp. 697 ◽

Cited By ~ 3

Author(s):

Sang Myoung Lee ◽

Ho Min Lee ◽

Do Guen Yoo ◽

Joong Hoon Kim

Keyword(s):

Water Quality ◽

Water Supply ◽

Water Pressure ◽

Pressure Head ◽

Quality Analysis ◽

Residual Chlorine ◽

Supply Network ◽

Water Quality Analysis ◽

Water Supply Network ◽

Proposed Model

Water supply facilities are vulnerable to extreme weather events, such as droughts and floods. To establish a sustainable solution that resists accidents and disasters, a distributed system is required. To supply high-quality tap water using the existing water-supply network, rechlorination facilities must be installed to secure residual chlorine at the pipe end. In this study, a process is developed to determine the injection points and dosages of rechlorination using the latest pressure-driven analysis. The method was compared to the results of demand driven analysis methods. The proposed model was applied to P City in Korea to draw results. A detailed evaluation was performed to study how water pressure head and demand-based hydraulic and water quality analysis results impact the injection points and dosages of rechlorination. Thus, the existing demand-based model shows significant spatial deviations in the pressure head in the presence of water pressure drops, which subsequently lead to over-estimation of chlorine injection dosages for maintaining the concentration of residual chlorine. However, the proposed model involves a numerically validated theory and draws more reasonable results for hydraulic, water quality, and rechlorination dosages. The proposed model can be used as a decision-making tool based on hydraulic analysis for the supply of water of a stable quality.

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