Functional Safety 2016

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…