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ALL THINGS FIRE PROTECTION | SUBSCRIBE NOW

How is Safety Factor Applied for Clean Agent?

1/2/2020

1 Comment

 
NFPA 2001 requires a safety factor under sections 5.4.2.3 through 5.4.2.5 for clean agent extinguishing concentrations.

What is the difference between the "design concentration" listed in Table A.5.4.2.2(b) (2015 edition) and this minimum extinguishing concentration (the minimum extinguishing concentration MEC x applied safety factor)?

In some cases the design concentrations are higher than the MEC x safety factor - is there a proper one to be using under NFPA 2001? Sorry if the question is basic - I've always just used the design concentrations.

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1 Comment
Randy
1/2/2020 10:42:13 am

If you read the note on Table A.5.4.2.2(b), it specifically says that the Class A design values are the greater of:
-the Class A MEC with 1.2 safety factor
-the Class B MEC for heptane (without a safety factor).

That should explain the variability you are seeing.

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  • Blog
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