Ken, this is a very good tip which I had never considered in my own varied circumstances. Besides I really do like your statement on how it changes the worst case scenario. Thanks for both. Joseph

On Mon, 06 Dec 2021 9:22 AM, Ken Kretchman wrote:
> Hi Margaret
>
> If your hydrogen source is a gas cylinder I would highly recommend obtaining it with a flow restricting orifice installed in the
> cylinder valve,å as obtained from your vendor.å We do this with our non toxic flammables as well as toxics.å It changes your worst case scenario considerably.
>
> Hope all is well.
>
> Ken
>
>
> *Ken Kretchman, CIH, CSP, FAIHA * Director, Environmental Health and Safety
> NC State University / Box 8007 / 2620 Wolf Village Way / Raleigh North Carolina 27695-8007
> Email: Ken_Kretchman**At_Symbol_Here**ncsu.edu / Phone:(919).515.6860 /Fax: (919).515.6307
>
>
> On Mon, Dec 6, 2021 at 10:51 AM Margaret Rakas > wrote:
>
> Good (?) morning,
>
> I am trying to determine the minimum exhaust for hydrogen gas (not liquified) and see that in NFPA 55, section 6.17.3.2 requires a minimum exhaust of 1 scf/min/ft2.å I had to look up scf--it is 'standard cubic foot' and is defined as 1 cubic foot of naturalå gas at 60F and normal atmospheric pressure.
>
> If I know the size of the room and air changes per hour, is it possible to calculate my exhaust without doing an experiment?
>
> MANY thanks!
> Margaret
>
> --
> Margaret A. Rakas, Ph.D.
> Lab Safety & Compliance Director
> Clark Science Center
> 413-585-3877 (p)
>
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>
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--
Joseph A. DiVerdi, Ph.D., M.B.A.
Associate Professor of Chemistry
Colorado State University, Fort Collins, CO, USA
+1.970.980.5868 - /diverdi.colostate.edu/
/us02web.zoom.us/j/9460709393

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