Typical risk reduction methods found in process plants

2 The risk reduction factor for a BPCS (which does not conform to tEC 61511 ANSI/ISA-84.00.01-2004 (lEC 61511 Mod) or lEC 61508) used as a protection layer shall be below 10. 

NOTE When considering how much risk reduction credit to be given to a BPCS, consideration should be given to the fact that a part of the BPCS may also be an initiating source for an event. 

3 If a risk reduction factor of greater than 10 is claimed for the BPCS, then it shall be designed to the requirements within this standard. 

No reproduction or networking permitted without license from IHS 

5 Requirements for preventing common cause, common mode and dependent failures 

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NOTE 3 Typical risk reduction methods found in process plants are indicated in Figure 9 (no hierarchy implied). 

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