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Subject: Re: [DCHAS-L] Hydrogen gas exhaust
Date: Monday, December 6, 2021 at 11:07:17 AM
Author: Richard Palluzi <000006c59248530b-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> 		Next by Date:
Subject: Re: [DCHAS-L] Hydrogen gas exhaust
Date: Mon, 6 Dec 2021 09:37:06 -0700
Author: Joseph DiVerdi

From: Ken Kretchman <kwkretch**At_Symbol_Here**ncsu.edu>
Subject: Re: [DCHAS-L] Hydrogen gas exhaust
Date: Mon, 6 Dec 2021 11:22:21 -0500
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: CAOYSQ48fixp-Z6D7nMxYpS3hbHpNX4cXuYoU-YCeYejnUPuiQQ**At_Symbol_Here**mail.gmail.com
In-Reply-To


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, as obtained from your vendor. We do this with our non toxic flammables as well as toxics. 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 <mrakas**At_Symbol_Here**smith.edu> 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. I had to look up scf--it is 'standard cubic foot' and is defined as 1 cubic foot of natural 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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