Abstract
This article describes the subject matter of the failure frequency of water supply pipes in Poland. The introduction to the article describes the causes of failures in the water supply network as well as a tool for assessment of the failure frequency of water supply pipes, i.e. damage intensity index. The status of Polish literature concerning the problem of failure frequency of water supply networks is also presented, and attention is paid to the absence of studies within the area of the Podlaskie voivodeship. The research part of the article presents the results of calculations of failure frequency indexes for water supply networks in the Podlaskie voivodeship. Materials from the Central Statistical Office for the period of 2015–2017 served as the basis for studies. Damage intensity indexes throughout the entire Podlaskie voivodeship were analyzed. The status of failure frequency of water supply networks was assessed in poviats of the Podlaskie voivodeship during the years 2015–2017. The mean level of failure frequency of water supply networks was also compared between the Podlaskie voivodeship, other voviodeships and the national average. As a result of calculations that were carried out, reference material was obtained for current and future studies concerning failure frequency of water supply networks in the Podlaskie voivodeship as well as other voivodeships of northern Poland.
Highlights
Failure repair in water supply pipes is part of a water supply system’s operation[1, 2]
In the Podlaskie voivodeships, the mean failure frequency of water supply pipes decreased from the value of 0.26 in 2015 to 0.23 in 2017
In 2015, the highest failure frequency indexes (λ2015, fail/(km·a)) of water supply pipes were noted in the Śląskie, Dolnośląskie, and Małopolskie voivodeships, and the lowest in the Lubelskie, Wielkopolskie and Mazowieckie voivodeships
Summary
Failure repair (e.g. water leaks) in water supply pipes is part of a water supply system’s operation[1, 2]. The occurrence of failures is a direct cause of water leakage from a water supply system[3]. Failures may be responsible for up to 75% of non-revenue water in a water company. Despite the fact that pipe failures are a normal phenomenon over the course of exploitation, their number, and the amount of water that is irreversibly lost, should be minimized [9, 10]. Damage intensity indexes λ are determined in the operational practice of a water supply system [16]. According to Kwietniewski [17], the value of damage intensity index λ should not exceed: - for mains λ < 0.3, - for distribution pipes λ < 0.5, - for service lines λ < 1.0
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