Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Reliability Analysis by Dynamic Fault Trees - A case study in sewage treatment systems
Submission Author:
Celso Luiz Santiago Figueirôa Filho , BA
Co-Authors:
Celso Luiz Santiago Figueirôa Filho, Edilson Assis, Lucas Silva, Ana Luiza Luiza Brasileiro Costa
Presenter: Celso Luiz Santiago Figueirôa Filho
doi://10.26678/ABCM.COBEM2017.COB17-2054
Abstract
The impact for environment preservation of sewage treatment systems reliability is significant. Fault Tree Analysis (FTA) is a well used method for reliability engineers but cannot express some dynamic behaviours of the system. Dynamic Fault Tree Analysis (DFTA) can describe some real scenarios that is not possible by static analysis.. The aim of this paper is to to compare the application of the static and a dynamic Fault Tree analysis for a sewage treatment system. First a static Fault Tree (FT) was elaborated in order to describe the tank overflow failure mode. Second, company experts interviews was carried out to detail the system behaviour. Next, the 1st and 2nd orders cuts were identified. Each basic event was defined and the probability of failure for each branch of the fault tree was formulated. Some operating conditions in which static gates do not represent the reality have been found. Then, the need for DFT gates were identified. Finally, failure probability was calculated by the DFTA and was compared to the FTA. The paper concluded that, in this case and in many others industrial systems, the DFTA modeling represents real scenarios better than the FTA.
Keywords
reliability, Fault Tree, sewage treatment, environment impact
