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Subject: Re: [DCHAS-L] Butyl Lithium & syringe safety
Date: March 8, 2013 11:27:01 AM EST
Author: Zack Mansdorf 		Next by Date:
Subject: Re: [DCHAS-L] Liquid nitrogen storage
Date: March 8, 2013 12:27:16 PM EST
Author: "Smith, George S."

From: NEAL LANGERMAN <neal**At_Symbol_Here**CHEMICAL-SAFETY.COM>
Subject: Re: [DCHAS-L] Liquid nitrogen storage
Date: March 8, 2013 11:42:18 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
1 acph is really low, way too low for a room w/ LN2 dewars. If other
reasons require that low level, then 1 or 2 O2 sensors (they need PM) are
essential.

If the complete failure of 1 dewar will drop O2 to < 20%, regardless of air
changes, then sensors are needed.

nl

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NEAL LANGERMAN, Ph.D.
ADVANCED CHEMICAL SAFETY, Inc.
PO Box 152329
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-----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 7:40 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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