Safety integrity level cost impact

Given the high PFD of the ZS sensor subsystem, it is likely that the entire subsystem could be eliminated without a significant penalty in overall PFD. This would again reduce the false trip rate and lifecycle cost. Of course, the calculations must be repeated for each proposed design to assure that the changes will not impact safety integrity below the required levels. 

An increase in management safety culture should have the same impact on safety outcomes as an increase in worker participation in safety decision making, for similar reasons as more management resources are employed toward integrating safety within overall corporate strategy—and as more ways are foimd to minimize post-injury retum-to-work hurdles—accident costs will be reduced. To the extent this happens, the returns to safety investments increase, the level of job safety rises, and time away from work because of injuries falls. Higher values... 

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