DCHAS-L Discussion List Archive
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
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)
--
Jeff Lewin
Director of Chemical Laboratory Operations
Research Integrity Office
Laboratory Operations
205 Lakeshore Center
Michigan Technological University
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