Tag:reliability indicator



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UDC 628.3:62-192

Alekseev M. I., Yermolin Yu. A.

On the specific character of wastewater system reliability indicators


Authors of technical literature related to various aspects of municipal wastewater disposal systems sometimes introduce notions and definitions that concede varying interpretations which is inaccurate, particularly when using mathematical tools. Therefore, the seve­rity and definiteness of terminology under the circumstances are of special importance. The necessity, possibility and specific character of sewer reliability indicators are discussed. One of such indicators based on the hypothesis of the steady state of «failure-rehabilitation» processes is analyzed. The calculation of the introduced integrated municipal sewer reliability indicators essentially amounts to the estimation of the predictable volume of raw wastewater discharged from the system in some period because of the failure of some elements. One of the possible approaches to the solution of this problem in the context of the hypothesis of the steady origin of the sewer elements and facilities failure and rehabilitation flow is the method of segmentation and equivalenting. The ways of extending the suggested approach to an unsteady case when the failure flow rate shows seasonal periodicity or the network elements show tendency to «ageing» are designated.

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UDC 628.14:62-192

Yermolin Yu. A., Alekseev M. I.

Consideration of object ageing in estimating its reliability


The issues related to the estimation of reliability of nonstationary (ageing) objects that are characterized by increasing failure rate with time are discussed. The lack of methods that could be used in engineering evaluation of the reliability of these objects is stated. The method is suggested that consists in nominal replacing the nonstationary object with fictive stationary one with failure rate constant value that is selected basing on several additional considerations. The relationships readily usable in practice and expressing the reliability index of the fictive objects through the parameters of the ageing characteristics of the actual nonstationary objects were obtained.

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Российская ассоциация водоснабжения и водоотведения

Конференция итог

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