Evaluation of safety instrumented system using “HAZOP-LOPA-FTA” methodology
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Date
2024-12-31
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ALGERIAN JOURNAL OF SIGNALS AND SYSTEMS (AJSS)Vol 9, Issue 4,2024.p-p 287-293
Abstract
Following the IEC 61508 standard, this paper presents a combined "HAZOP-LOPA-FTA" method
for evaluating the safety level of a High Integrity Pressure Protection System (HIPPS) which is a type of SIS.
The technique combines hazard and operability analysis (HAZOP), layers of protection analysis (LOPA), and
fault tree analysis (FTA). This paper aims to confirm that a safety instrumented system achieves the intended
safety integrity level as per IEC 61508. If not, suggest upgrading the safety instrumented system to lessen the
effects of the scenario under study. The technique was used in the C-63 distillation column at RA1K Skikda
refinery. HAZOP identified important causes and effects. According to LOPA, a minimum safety level was
determined. The real SIL rating was calculated using the Tree module in the GRIF software.