Define a risk-management strategy

1) Define a risk-management strategy establish a facility management system for how SIS are identified, designed, inspected, maintained, tested, and operated to achieve safe operation and perform a hazard and risk analysis to identify where SIS are needed and their target SIL. 

2) Implement the strategy develop a design basis to achieve the target SIL and execute the detailed design to meet the requirements. 

3) Validate, start-up, operate and maintain the strategy implement the SIS following the design basis and detailed design documentation and define what is required of operation and maintenance personnel to sustain the SIL. 

To develop the risk-management strategy, start with a process hazards analysis (PHA) and review the process design and its control, operation, and maintenance practices. Select a multidisciplinary team with expertise in these areas, and use an accepted hazard-evaluation procedure, such as a hazard and operability (HAZOP), what-if, or checklist analysis, to determine how process deviations from intended 

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