Katarzyna Pietrucha-Urbanik

Failure Prediction in Water Supply System – Current Issues

The presented method for the assessment of water supply system functioning in face of undesirable events occurrence takes into account the failure analysis. The developed analysis will allow decision support in the economic efficiency assessment of the water supply infrastructure functioning. The proportional hazard method for the failure of water pipes assessment enables to assess the reliability of water pipes and to obtain the possibility of prediction of undesirable events. The use of the proposed method can significantly support management analysis of water supply system. The establishment of the assessment parameters is very important issue that requires the use of waterworks experience. Moreover, it is based on the real data from the water supply system functioning.

Assessing the Costs of Losses Incurred as a Result of Failure

Recently, availability of the water supply system safety is the important issue in the water management. Water network is very complex and therefore requires proper analysis of its functioning. Water companies are responsible for providing potable water to the recipients, who anticipate that drinking water utilities guarantee reliable and safe supply. The aim of this paper is to present the method of failure cost assessment with application of multidimensional comparative analysis. In the paper the set of cost analysis was presented, that can be implemented to the assessment of planning investments and modernization. The approach will enable the comparison of costs level intended for failure removal in different water supply system.

Prioritizing Water Pipe Renewal Using Fuzzy Set Theory / Priorytetyzacja Odnowy Przewodów Wodociągowych z Zastosowaniem Teorii Zbiorów Rozmytych

Abstract The aim of this paper is to present the novel approach to risk assessment in combination with failure and consequence analysis, depending on two parameters defined by the fuzzy functions: the repair time of water pipe and the cost of water pipe repair, what allow to determine particular risk levels. The presented methodology can be used to describe the functioning of the public water supply in terms of its renewal. Streszczenie Celem niniejszej pracy jest przedstawienie oceny ryzyka w połączeniu z analizą awarii oraz konsekwencjami, w zależności od dwóch parametrów określonych przez rozmyte funkcję: czas naprawy poszczególnych przewodów wodociągowych, jak również kosztów naprawy przewodów, co pozwoli określić, poszczególne poziomy ryzyka. Przedstawiona metodologia może być stosowana w celu opisania funkcjonowania wodociągów publicznych oraz w zakresie ich odnowy.

Contribution to Diffusion Processes Application in the Area of Critical Infrastructure Security Assessment

Assessing the vulnerability of critical infrastructure objects is of major concern when dealing with the process of dependability and risk management. Special attention is paid to the objects of higher interest, such as nuclear power plants. In spite of the protection of these objects, there is still a certain level of a potential threat. The aim of the paper is to describe a possible way of attacking on the object in order to get into a particular part of it. Several characteristics of an adversary ́s attempt were obtained. For this reason as well as for modelling adversary ́s behaviour diffusion processes have been used.

Analysis of chemical stability of tap water in terms of required level of technological safety

Abstract The main goal of this work is to show the new approach to determining safety technological levels (SLs) in terms of water quality and its chemical stability, as well as issues of water corrosion properties in water distribution systems (WDSs), due to the fact that water supply pipes are prone to corrosion. In the paper the methodology of determining the risk associated with threat to technical infrastructure was considered. The concept was studied on the basis of real operational data from the water treatment plant. The probability of exceeding the individual parameters for WTPI is slightly larger than for WTPII, which means that this water treatment process may cause lack of chemical stability in the water supply network. Operators should anticipate in the process of designing water distribution system, using proper materials, as to ensure an adequate level of safety from the water source to the water recipient. It should be noted that it is necessary to adjust the material of internal installation of water supply networks to the parameters of the water. At present, there are no correlations between the designing step and water parameters. It was concluded that to protect the water supply infrastructure, which belongs to critical infrastructure, water company should put more emphasis on distribution of stable water that has not potentially corrosion properties. Some suggestions were made for the protection of WDS and to ensure safety of system functioning and long-term usability of water pipes.

Safety Problems of Small Water Supply Systems

Abstract The paper presents issues related to risks associated with the operation of small water supply systems on the background of water consumer safety assessment made on the basis of risk analysis. Definition of water consumer safety loss as a risk associated with the water consumption of poor quality or water lack was proposed. For this purpose, a three-parameter matrix is implemented with the parameters of the probability of a representative accident scenario, the losses of the water consumers and their protection. Risk management, together with the implementation of protective barriers of small water supply system against threats is a fundamental condition for the continued operation of the system.

Analysis and assessment of water distribution subsystem failure

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.

Spatial Analysis of Water Infrastructure Development On Example of Eastern Europe Rural Regions

In the paper the assessment of water supply in rural areas in Poland was performed in aspect of future problems and the necessity of investments. The analysis proposed in this work is a helpful tool in making the ranking of the level of infrastructure development in different regions of the country. The assessment of the water supply network functioning is a very important issue that requires the use of operational experience with the practice of water supply. The analysis was based on data associated with the exploitation of water supply systems. Among others, to illustrate this diversity, the multidimensional comparative analysis was used. The developed analysis will enable decision support in the process of evaluating the economic efficiency of the operation of water supply infrastructure, through established indicators including the water network length development.

Simulation model of contamination threat assessment in water network using the EPANET software

Abstract The aim of this study is to assess the risk of failure of group water network in case of raw water contamination. The analysis was based on qualitative simulation performed in hydraulic water network model developed in the EPANET software. It was focused on the quantitative description of the consequences of chemically contaminated water. The methodology of risk assessment relies in determining the consequences of the supply water containing contamination threatening the health and lives of water consumers. The research methodology is as follows: development of a hydraulic model of the water pipeline and it’s hydraulic verification, computer simulations of contamination propagation, calculating the dose delivered to the i-th section of the water supply system supplying water to Ni recipients and the mass of a substance that enters the body li. The simulation results indicate the spread of contamination that after 24 h covered most of the area supplied with water. The load delivered to the resident obtaining water from the i-th section of the water supply network, Li/Ni, was up to 18 g·d-1, at least 15 g·d-1 was received by 34.9% of the population, 10-15 g·d-1 by 12.5% of the residents, 5-10 g·d-1 by 10.7% of the residents, 0-5 g·d-1 by 41.7% of the residents and uncontaminated water was delivered to only 13.3% of the consumers. The dose taken by the statistical consumer (calculated as for adults) l is up to 0.8 g for Li/Ni = 18 g·d-1 and is proportional to Li/Ni.

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

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. Streszczenie W pracy omówiono kluczowe zagadnienia dotyczące zaopatrzenia w wodę w zakresie prowadzenia analizy awaryjności sieci wodociągowej. Przedstawiono wskaźniki opisujące awaryjność, straty wody oraz dostępność usług wodociągowych oraz wyznaczono ich wartości w oparciu o dane z eksploatacji. W celu poznania bieżącej sytuacji infrastruktury wodociągowej konieczne jest przeprowadzanie okresowo analiz awaryjności sieci wodociągowej, które zaproponowano w tej pracy. Szczegółowa analiza awaryjności oraz strat wody występujących w sieciach wodociągowych, powinny być głównym elementem systemu zarządzania miejską siecią wodociągową, a w szczególności uwzględnione w strategicznych planach jej modernizacji.