Risk assessment methods of a water supply system in terms of reliability and operation cost

Zimoch, Izabela; Szymik-Gralewska, Jolanta

doi:10.2495/uw140051

Cited by 8 publications

(13 citation statements)

References 3 publications

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“…The analysis includes data related to pumps renewals and maintenance ie date of failure, renewal or inspections occurrence and date of its closure. The reliability indicators for each pump are calculated according to following formulas [3,10,15]: a) average operating time between failures T p :…”

Section: Reliability Calculation Methodsmentioning

confidence: 99%

“…According to the literature [3,10,[16][17][18][19]] the values of readiness indicator are calculated to seven decimal places [15].…”

Section: Reliability Calculation Methodsmentioning

confidence: 99%

“…To ensure required water quality, in many WTPs new subsystems have been provided eg ozonation, sorption etc. However, adjusting plant's production capacity to the current demand and bearing the lowest possible costs is much more complicated process and it requires various analysis including assessment of costs efficiency and reliability [3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Reliability-Cost Efficiency of the Pumping Subsystems at Water Treatment Plant

Zimoch

Szymik-Gralewska

2016

Ecological Chemistry and Engineering S

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Abstract:In last years all countries of the European Union experience decrease of water consumption. What is worse, in most cases large European water treatment plants (WTP) have been design and built decades ago, when water consumption was much higher than nowadays. It is a challenging task to adjust WTP's capacity to the current water demand as it is associated with costs and safety issues. Minding that fact, authors decided to propose an new authorial methodology of combined reliability-cost efficiency assessment for water supply system with exceeded redundant capacity, based on new index -unit indicator of reliability-cost efficiency. It included both reliability and costs aspects. It was decided to present the new method on example of the pumping subsystems working for WTP in Poland. The research was based on Activity-Based Life Cycle Costs (AB-LCC) methodology together with two-parametric reliability evaluation. Using real operational and financial data an application of proposed authorial reliability-cost indicator was presented. The reliability-cost efficiency assessment allowed to present how operation of each pumping subsystem influenced global operational costs of WTP. This information is essential for decision-making process for rational management of technical facilities.

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Section: Reliability Calculation Methodsmentioning

confidence: 99%

“…According to the literature [3,10,[16][17][18][19]] the values of readiness indicator are calculated to seven decimal places [15].…”

Section: Reliability Calculation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of the Reliability-Cost Efficiency of the Pumping Subsystems at Water Treatment Plant

Zimoch

Szymik-Gralewska

2016

Ecological Chemistry and Engineering S

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“…The biggest Polish drinking water treatment plants (DWTP) supplying cities such as Warsaw, Cracow, Wrocław or Katowice have been designed, built, and often expanded when the general assumption was, that there would be a continuous increase in water demand [3,4]. Minding the fact that lower water consumption is now observed, mentioned technical systems have significant redundant (underutilized) capacity.…”

Section: Introductionmentioning

confidence: 99%

Improving the operation of a surface water intake with exceeded redundant capacity using reliability analysis and life cycle costing

Zimoch¹,

Szymik-Gralewska²

2016

Environment Protection Engineering

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Integrated procedures of analysis have been presented combining both reliability and economical aspects of operation of a water supply system (WSS). The method presented is a practical application of the reliability analysis and life-cycle costing which is a part of a decision support system (DSS) for WSS. It focuses on undisturbed operation of systems with exceeded redundant capacity minding system's reliable and lower possible operational costs. The proposed analytical approach is shown on the example of the surface water intake which is the first subsystem of WSS influencing operation of a whole system. As a part of the study, reliability and economic assessments of various variants of future operation of water intake have been carried out as a basis for choosing most advantageous solution. The authors indicate how exceeded redundant capacity affects applied maintenance method of the system. All calculations of the reliability indicators are based on operating data contained in exploitation logs (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012). The costs have been estimated based on the obtained financial documentation.

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“…In [32], a reliability of sand filters, as a part of a whole WDS, is considered. For the costs function, a concept of Life Cycle Costing is adopted.…”

Section: Introductionmentioning

confidence: 99%

On simulation of maintenance costs for water distribution system with fuzzy parameters

Romaniuk

2016

EiN

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Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl IntroductionThe main aim of each water distribution system (WDS, water pipes network) is to deliver water of desirable quality and assumed quantity for customers. In order to meet these requirements, maintenance services, like repairs and replacements of broken or malfunctioned parts, are required.The literature devoted to the problems of simulation of the WDS behaviour and to analysis of its reliability is very rich (see, e.g, [3, 4, 7, 10, 11, 15, 17, 19, 25, 29] for a description of various approaches, and [16,28] for a more detailed review of methods and literature). Because of a necessary long-time horizon planning (e.g. 20 or even 50 years), an influence of a value of the money in the future on maintenance costs should be taken into account. Also such a problem is addressed in many papers.For example, in [20], the main aim is to estimate and validate various cost functions for different types of assets of a WDS, if their hydraulic (e.g., flow, pump head, pump power) and physical characteristics (e.g., volume, material, nominal diameter) are stored in a specially prepared data base. A method of a linear regression is used to model a dependency between various types of the costs (like an equipment cost) and the mentioned characteristics of a pipe (like a nominal diameter) based on data from several Portuguese urban water utilities. However, a method for a calculation of a present value of the total costs is not developed there in a more detailed way.Contrary to the previous paper, in [12], let's say, a "macro-management" approach for a WDS rehabilitation problem with a real long-time horizon is widely discussed. In this paper, both an economics and hydraulic capacity of a WDS is analysed, if a deterioration of a pipe follows the Hazen-Williams equation. The total costs are related RomAniuk m. on simulation of maintenance costs for water distribution system with fuzzy parameters. Eksploatacja i niezawodnoscmaintenance and Reliability 2016; 18 (4): 514-527, http://dx.doi.org/10.17531/ein.2016.4.6. to a rehabilitation of a pipe and some additional maintenance costs (mainly breakage repair costs). To model the breakage rate, the exponential dependency on an age of a pipe is assumed. The present value of the total costs is then calculated using a constant discount rate. The main aim of the whole procedure is to minimize the total costs associated with a rehabilitation, if some hydraulic constraints, necessary for a quality and a quantity of the supplied water, are preserved. As mentioned in this paper, an analysis period for such a procedure is typically equal to 30-60 years.There are also more specialized approaches to the problem of the costs estimation. For example, in [25], an optimisation procedure for a problem of minimising the costs is also described. In this case, the authors express the total cost of a renewal, risk and an unavailability of a WDS as one func...

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Risk assessment methods of a water supply system in terms of reliability and operation cost

Cited by 8 publications

References 3 publications

Assessment of the Reliability-Cost Efficiency of the Pumping Subsystems at Water Treatment Plant

Assessment of the Reliability-Cost Efficiency of the Pumping Subsystems at Water Treatment Plant

Improving the operation of a surface water intake with exceeded redundant capacity using reliability analysis and life cycle costing

On simulation of maintenance costs for water distribution system with fuzzy parameters

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