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

2018 ◽  
Vol 44 ◽  
pp. 00175 ◽  
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.

scholarly journals Quality Analysis of Water Network Failure

2018 ◽  
Vol 47 (1) ◽  
pp. 67-85 ◽  
Author(s):  
Barbara Tchórzewska-Cieślak ◽  
Dawid Szpak ◽  
Izabela Piegdoń ◽  
Anna Szlachta
Keyword(s):  
Water Supply ◽  
Failure Rate ◽  
Quality Analysis ◽  
Material Structure ◽  
Supply Network ◽  
Water Supply Network ◽  
Network Failure ◽  
Rate Analysis ◽  
Provincial City ◽  
Water Supply Company

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.

scholarly journals Water Loss Analysis as an Element of Operation Management of Water Supply System

2019 ◽  
Vol 49 (2) ◽  
pp. 55-77
Author(s):  
Jakub Żywiec ◽  
Barbara Tchórzewska-Cieślak
Keyword(s):  
Water Supply ◽  
Failure Rate ◽  
Water Loss ◽  
Technical Condition ◽  
Supply System ◽  
Water Supply System ◽  
International Standards ◽  
Water Losses ◽  
Safety Level ◽  
Water Supply Company

Abstract The aim of the study was an cause and effect analysis of water losses in the collective water supply system of the city located in south-eastern Poland. The exploitation data provided by the water supply company from 2012 - 2016 was used for the analysis. The study uses the recommendations of the IWA (International Water Association) for the water balance making and determination of water loss indicators. The values of water loss indicators were compared to international standards and the technical condition of the network was determined. In addition, failure rate analysis of the water supply network was performed based on the failure rate index λ. Based on the performed analysis, it was found that the water supply company should consider renovation or replacement of the main network pipelines to increase the safety level of water supply, reduce the amount of water losses and the company exploitation costs.

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

2018 ◽  
Vol 44 ◽  
pp. 00140 ◽  
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.

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

Resources ◽  
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.

scholarly journals Failure Analysis of the Water Supply Network in the Aspect of Climate Changes on the Example of the Central and Eastern Europe Region

2019 ◽  
Vol 11 (24) ◽  
pp. 6886 ◽  
Author(s):  
Jakub Żywiec ◽  
Izabela Piegdoń ◽  
Barbara Tchórzewska-Cieślak
Keyword(s):  
Climate Change ◽  
Water Supply ◽  
Failure Rate ◽  
Air Temperature ◽  
Climate Changes ◽  
Economic Damage ◽  
Water Supply Systems ◽  
Sudden Increase ◽  
Supply Network ◽  
Water Supply Network

The consequences of climate changes are felt by society every day. A sudden increase or decrease in air temperature, increasingly frequent, extreme weather phenomena can cause enormous economic damage to countries and cities. The occurrence of random weather phenomena and their negative impact on technical infrastructure nowadays are the basic problem related to ensuring the safety of the functioning of each system. Climate changes and significant air temperature amplitudes have a direct impact on the functioning of the critical infrastructure of cities, which includes collective water supply systems (CWSS). The paper presents the impact of climate change on the failure of a water supply network. Correlation between failure rate and air temperature was determined. This was used to determine the number of failures for the near 2036–2050 and distant 2086–2100 future in terms of climate change (temperature increase). The results confirm the thesis known from the literature that the failure rate decreases as the temperature increases. For forecasted periods as a result of temperature rise due to climate change, the reduction of the number of water pipe failures is expected in the range of 1.22% to 2.35% for the 2036–2050 period and from 2.96% to 8.66% for the 2086–2100 period, depending on the development of Representative CO2 Concentration Scenarios (RCP). The decrease in the total number of failures will have an impact on the increase in the reliability and safety of water supply to consumers.

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