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Tuesday, August 17, 2010

Inherent Safety = Lower Risks?

On his blog our friend Dr. Saraf asks: Inherent Safety = Lower Risks?

He is speaking of chemical processes, but this thinking can be applied to other industries and processes. For example, on a dust collection system, considering where you locate the fan and what type fan used, whether to return the air back to the plant, etc., can lead to an inherently safer design.

Recently a customer utilized a spark resistant fan on a wood dust closed loop relay system with light loading, thus reducing the need for additional spark detection and extinguishing systems in this particular design. The NFPA 664 Prescriptive design was to add Spark detection. By building the process safer, he was able to get his design approved by the local AHJ.


The rest of Dr. Saraf's blog post:
Chemical processes and designs are increasingly being evaluated for inherent safety - i.e. reduce the hazard rather than the risk. The philosophy behind inherent safety is ‘What You Don’t Have, Can’t Leak’ and so you take necessary steps to reduce the hazard.
Issues where inherently safer approaches can be successfully applied are fairly low, maybe 2%. Inherent safety framework suffers few major drawbacks - (a) not accounting for risk-benefit and (b) not providing acceptable risk criteria and a decision system to go along with it.
Eliminating hazards is may not always be practical as we know there is risk involved in every action. Even eating a burger.
Therefore as a matter of practicality, I recommend thinking of inherently safer alternative as lower risk option.
Within the framework of risk management, one can include evaluations of safer alternatives and be able to reach a decision.

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