Abstract
Process equipment and plant maintenance problems are complex in the oil refinery business, since effective maintenance needs to ensure the reliability and availability of the plant. Failure Mode and Effects Analysis (FMEA) is a risk assessment tool that aims to determine possible failure modes, and to reduce the ratio of unknown failure modes, by identifying business-critical systems and the risks of their failures. For the identified failure modes, FMEA determines risk mitigation action(s). The goal is to prevent failure and keep assets and plants running at peak performance by providing fully integrated operations, maintenance, turnarounds, modifications, and asset integrity solutions, during all phases of the asset life cycle. This research was based on FMEA use/application in refineries’ units, and proposes the new fuzzy FMEA risk quantification approach method: “four fuzzy logic system”. The model included a pre-assessment, by sets of fuzzy logic systems, that examined the input parameters that affected the variables of severity, occurrence, and detectability. The proposed model prioritized risks better and addressed the drawbacks of the conventional FMEA method.
Highlights
Faculty of Mechanical Engineering and Naval Architecture Ivana Lučića 5, 10002 Zagreb, Croatia; Abstract: Process equipment and plant maintenance problems are complex in the oil refinery business, since effective maintenance needs to ensure the reliability and availability of the plant
The proposed model consisted of four separate fuzzy logics and included the initial assessment of the input parameters that influenced the variables of severity, occurrence, and detectability for the identified failure modes in the refinery production process
The rank of output for the fuzzy Risk Priority Number (RPN) variable was defined by int val set [1, 1000] (Table 4), with the objective of a simpler comparison 7ofof 22 the resu achieved by applying the model with a conventional RPN calculation
Summary
Faculty of Mechanical Engineering and Naval Architecture Ivana Lučića 5, 10002 Zagreb, Croatia; Abstract: Process equipment and plant maintenance problems are complex in the oil refinery business, since effective maintenance needs to ensure the reliability and availability of the plant. Failure Mode and Effects Analysis (FMEA) is a risk assessment tool that aims to determine possible failure modes, and to reduce the ratio of unknown failure modes, by identifying business-critical systems and the risks of their failures. For the identified failure modes, FMEA determines risk mitigation action(s). The process of understanding risk implies the specific causes of risk, and the possible effects that are relevant to them. This can be manifested in the form of safety, health, environment, business impacts, damage to equipment, or a combination of the above. Risk assessment can be defined as the general process of identifying, analyzing and evaluating risk. Risk is a subjective concept that takes into account both the uncertainty and limitations of the existing know-how, as well as the attempts to predict a reliable outcome of an event
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