The analytical hierarchy process (AHP) method can be used as a powerful tool to prioritize assets according to their criticality. Several group creativity activities, such as brainstorming, nominal group techniques, etc., can be organized to assess equipment. A wide range of documents and drawings may be analyzed to help provide a more effective and efficient study. Document analysis is used as another tool. Such expertise is provided by any group or individual with specialized knowledge or training in safety, cost estimation, operation, maintenance, environment, health, design, etc. Tools and techniquesĮxpert judgment should apply to the inputs used to develop the equipment criticality list/classification, and to all technical details during this assessment. Hidden faults that are not evident to the operator during normal operation should also be considered as input to the assessment. Typically, each index contains a table with three different levels (A, B, C), as shown in TABLES 3 and 4. Decision criteria normally includes four main indexes for safety, environment, production, and operation and maintenance costs. The definition of the consequence classes should be conducted in accordance with the company’s criteria for safety and the environment, and reflect actual plant operations for determining economic losses, such as costs related to lost operation. This helps assess the consequences of equipment failures, and the degree of sparing and redundancy. To conduct the analysis, which mainly assesses the consequences of equipment failures and the degree of sparing and redundancy, the consequence classes must be properly defined prior to beginning the analysis. as sub-systems.įor criticality analysis, the following drawings and documentation should be available: detailed plant/system description or control narratives, datasheets, P&IDs, process flow diagrams (PFDs), single-line diagrams, cause-and-effect diagrams, shutdown logic, etc. For example, scrubbing would include scrubbers, pressure safety valves (PSVs), shutdowns, alarms, etc.
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