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Subject: Re: [DCHAS-L] Hydrogen gas exhaust
Date: Monday, December 6, 2021 at 12:14:50 PM
Author: Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM> 		Next by Date:
Subject: [DCHAS-L] Chemical Safety headlines (12 articles)
Date: Wed, 8 Dec 2021 06:48:28 -0500
Author: Ralph Stuart

From: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Subject: Re: [DCHAS-L] Hydrogen gas exhaust
Date: Mon, 6 Dec 2021 19:40:45 +0000
Reply-To: Monona Rossol <actsnyc**At_Symbol_Here**cs.com>
Message-ID: 333394095.2520.1638819645532**At_Symbol_Here**mail.yahoo.com
In-Reply-To


At 6 ACH and the right MERV filter and % fresh air, that would be a good place to hang out to avoid omicron.   Monona


-----Original Message-----
From: Dr Bob <drbob**At_Symbol_Here**FLOWSCIENCES.COM>
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Sent: Mon, Dec 6, 2021 12:14 pm
Subject: Re: [DCHAS-L] Hydrogen gas exhaust

 
 
Hi Princeton!
 
This 1scf.min/ft2 winds up being 6 ACH with a 10' ceiling. For storage or use.
 
{10 cfm * 60 = 600 Cubic feet per hour;   divided by 10 Cubic feet of projected floor area = 6 ACH}
 
No matter what?
 
Really?
 
Dr. Bob Haugen
Director of Product and Technology Development
Flow Sciences, Inc.
 
910 332 4878
 
www.flowsciences.com
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CONFIDENTIALITY NOTE: This e-mail, including all attachments, is directed in confidence solely to the person(s) to whom it is addressed, or an authorized recipient, and may not otherwise be distributed, copied or disclosed. The contents of this transmission may also be subject to intellectual property rights and all such rights are expressly claimed and are not waived. The contents of this e-mail do not necessarily represent the views or policies of Flow Sciences Inc. or its employees.
 
 
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Jeffrey Lewin
Sent: Monday, December 6, 2021 11:05 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Hydrogen gas exhaust
 
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 (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
 
--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas
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