Volume 22, Issue 2 (IJIEPM 2011)                   2011, 22(2): 193-204 | Back to browse issues page

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Associate Professor, Iran University of Science and Technology, Tehran, Iran , shahanaghi@iust.ac.ir
Abstract:   (7677 Views)
This paper describes Risk Based Inspection (RBI) methodology which is constructed in one of the units of Tehran Oil Refinery, (ISOMAX unit). The result of RBI Execution is a risk matrix which is constructed with Probability of Failure and Consequence of Failure. To define risk, probability of failure and consequence of failure and active damage mechanism were recognized. Riskwise software was assisted for implementing RBI. All equipment categorized into 3 main risk area based on the RBI results which were high risk, medium risk and low risk. High risk area is separated to Toxic and Non-Toxic area. As a result 4 risk area was considered. In addition an application of the Analytical Hierarchy Process (AHP) to select the most practicable maintenance strategy for equipment which is located in each risk area is described. To arrange the hierarchic structure & evaluation, four main criteria were defined (safety, cost, value added, feasibility) for pairwise judgments. Four possible alternatives are considered to complete the model, preventive, corrective, condition based and reliable centered maintenance.
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