Abstract
The aim of the paper is to present proposals for the determination of the operational failure probability categories of sewers. It includes the results of a review of eleven classifications for assessing the technical condition of sewer pipes used in some countries in Europe, North America, Asia and Australia. The result of the analysis is to indicate differences between the recommendations formulated in the guidelines, resulting from the types of defects and the accepted classes. The key conclusion highlights that the application of different classification methods to assess the operational state of sewer pipes contributes to the receiving of discrepancies in their assessment. Consequently, different priorities are indicated for subsequent inspection and maintenance as well as contradictory forecasts of potential failures. The original element of the work is to present discrepancies in the assessment of three types of defects (roots, sediments, protruding connections) occurring in sewers, assessed according to selected classifications, as well as proving the necessity to undertake work aimed at determining correct recommendations, and enabling a reliable assessment of the operational condition.
Highlights
The technical condition of sewers deteriorates over time
As previously indicated, the guidelines of PN EN 13 508-2 (2006) do not provide proposals for classifying defects and classes of technical condition These classifications indicate other additional defects from the exploitation group, i.e. the WRc classification (2001), apart from those mentioned in point 3, indicates: other obstacles and infiltration, for which it does not propose a determination of the category of probability
Many classifications are used to assess the technical condition of sewers, which as a result of their use unevenly assess their operational state
Summary
The technical condition of sewers deteriorates over time. This is influenced by the long-term work of sewers, the quality of materials used, the quality of workmanship, or the chemical composition of transported sewage, and the surroundings of the pipe (eg. the condition of the ground or the way the land above the sewer is used). The technical condition of sewers deteriorates over time This is influenced by the long-term work of sewers, the quality of materials used, the quality of workmanship, or the chemical composition of transported sewage, and the surroundings of the pipe Sewage systems are technical systems that fulfill specific functions in a given area [2]. Their basic task is to safely transport wastewater [3] from the catchment area to the receiver. According to [1], a properly working sewer discharges the assumed amount of sewage into the receiver, it is neutral for the environment in which it is arranged and operates with the minimum (according to the state of the art) operating nuisance for the network manager
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