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Subject: Re: [DCHAS-L] Liquid nitrogen storage
Date: March 8, 2013 10:47:24 AM EST
Author: Timothy Hauser 		Next by Date:
Subject: Re: [DCHAS-L] Liquid nitrogen storage
Date: March 8, 2013 11:06:54 AM EST
Author: "Ferm, Barret"

From: "Brennan, Catherine (Environment Health & Safety)" <CRBRENNAN**At_Symbol_Here**EHS.UNC.EDU>
Subject: Re: [DCHAS-L] Liquid nitrogen storage
Date: March 8, 2013 10:54:02 AM EST
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: <5564F9EDC11C09468EE5DAF02B5CB30F29529073**At_Symbol_Here**BY2PRD0410MB376.namprd04.prod.outlook.com>

Ralph-
You will need to figure out volume of room, volume of gas and do a calculation based on expansion ratio with ACH to determine % oxygen. This is a nice document from Jefferson lab with more info": http://www.jlab.org/accel/safetylb/ODH-book.pdf
-Cathy

-----Original Message-----
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Ralph B Stuart
Sent: Friday, March 08, 2013 10:40 AM
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
Subject: [DCHAS-L] Liquid nitrogen storage

Does anyone have a rule of thumb for a ventilation rate in a room which is being used to store liquid nitrogen containers? Several credible web sources recommend a "well-ventilated area" without mentioning numbers. We have a room under consideration for this purpose with about 1 air change per hour. This seems low to me, but I thought I would sanity check it with DCHAS-L.

Thanks for any help with this.

- Ralph


Ralph Stuart CIH
Chemical Hygiene Officer
Department of Environmental Health and Safety Cornell University

rstuart**At_Symbol_Here**cornell.edu

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