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Subject: [DCHAS-L] Hydrogen gas exhaust
Date: Monday, December 6, 2021 at 10:42:00 AM
Author: Margaret Rakas <mrakas**At_Symbol_Here**SMITH.EDU> 		Next by Date:
Subject: Re: [DCHAS-L] Hydrogen gas exhaust
Date: Mon, 6 Dec 2021 11:07:17 -0500
Author: Richard Palluzi

From: Jeffrey Lewin <jclewin**At_Symbol_Here**MTU.EDU>
Subject: Re: [DCHAS-L] Hydrogen gas exhaust
Date: Mon, 6 Dec 2021 11:04:41 -0500
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: CAEwQnqikpsLJ=0C3mP68bZN-AEz+1UU4FZqv_9B60+=oO+TLLQ**At_Symbol_Here**mail.gmail.com
In-Reply-To


The 2020 edition has the following revision (in parenthesis):

Mechanical exhaust or fixed natural exhaust ventilation shall be provided at a rate of not less than 1scf.min/ft2 (0.0051 m3 / sec / m2) of floor area over the area of storage or use.

Jeff


On Mon, Dec 6, 2021 at 10:52 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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--
Jeff Lewin
Director of Chemical Laboratory Operations
Research Integrity Office
Laboratory Operations
205 Lakeshore Center
Michigan Technological University

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