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.
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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