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Design of Safety Instrumented Systems:

Safety Instrumented Systems are designed to reduce the risk that a Process may become hazardous. The required Safety Integrity Level (SIL) for a process is the number of orders of magnitude by which the baseline risk factor must be reduced to bring it to an acceptable level. Using well-established risk identification and assessment techniques such as Hazard and Operability Reviews (HAZOP), Failure Mode Effects Analysis (FMEA), Event Tree Analysis, and Layer of Protection Analysis (LOPA), we work with our clients to establish the baseline risk levels for their processes. Next, we work with them to establish where the acceptable risk levels should be. This allows a selection to be made of the appropriate Safety Integrity Levels required of the system. Finally, from this, we are then able to design Safety Instrumented Functions within the Safety Instrumented System that provide the required levels of risk reduction in the most cost-efficient manner possible.

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