Abstract
This paper addresses the design of functional safety for process automation in accord with IEC 61508/ 61511 standard. Functional safety design of a tail gas treating unit has been conducted in this study. The average probability failure on demand was calculated using fault analysis and then used as the criterion for the safety instrumented function design in order to conform the required safety integrity level (SIL). The result reveals that the architecture of safety instrumented function, the test interval, and the test method made a significant impact on improving the average probability of failure on demand (PFD avg ) of the process. In addition, the cost-benefit evaluation was justified from asset & production loss consequence using As Low As Reasonably Practicable (ALARP) method in order to determine justification for the additional investment of the high SIL against the given additional risk reduction.
Highlights
In industrial automation processes, risks and hazards is very likely to occur due to the production process and the chemicals used
GE Jolliffe [6] discussed on the ALARP (As Low As Reasonably Practicable) assessment for the costs of Safety Instrumented Function design and installation The high cost by considering the relationship between the costs of investing in the benefits to be received, including compilation of case studies related to the introduction of ALARP
Will be done considering the cost of capital relative to the benefits by ALARP that the highest Safety Integrity Level (SIL) is resulted from asset & production loss consequence, to determine the additional investment of the high SIL of safety instrumented function against the given additional risk reduction gained is justified or not
Summary
Risks and hazards is very likely to occur due to the production process and the chemicals used. The consequences of this may cause injury, loss of production and environmental damages etc. Will be done considering the cost of capital relative to the benefits by ALARP that the highest SIL is resulted from asset & production loss consequence, to determine the additional investment of the high SIL of safety instrumented function against the given additional risk reduction gained is justified or not
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