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4. Redesign the process
Fully rate and remove the HP/LP interface, or:
Redesign to enable credit to be taken for Independent Protection Layers
• Fit restriction orifice to limit flow to within PSV capacity (reduce SIL <1)
• Fit check valves to prevent backflow (e.g. 2 dissimilar check valves)
• Change LO/LC philosophy to prevent hazard…