A TWO-UNIT WATER PROCESS SYSTEM CONSIDERING ONLINE REPAIR OF MINOR FAULTS WITHOUT AUTOMATIC SWITCHING OF COMPONENTS IN REDUNDANT SUBSYSTEM

摘要

The aim of the present paper is to assess reliability and cost-benefit of a two identical units water process system wherein each unit comprises several redundant and non-redundant subsystems. The redundant subsystems are considered to be of two types, namely 1 -out-of-2 (Type-I) and 2-out-of-3 (Type-II). On occurrence of a minor fault in the unit it goes to partial failure whereas in case of a major fault the unit goes to complete failure. Further, on partial failure of the unit, the repairman firstinspects the unit to judge which subsystem has the minor fault and accordingly carries out the online repair of the subsystem without automatic switching of the components of redundant subsystem to avoid losses (including loss of power generation) etc.Various measures of system effectiveness for the model are obtained using Markov process and regenerative point technique. Using these measures, profit incurred to the system is computed. Using real data the reliability and cost analyses of the system are carried out as a particular case. Various conclusions are made by plotting graphs.