One change per hour seems very low. Have you considered putting an oxygen sensor in the room with the alarm outside the door?
Timothy M. Hauser, CHMM
Manager, Environmental, Health & Safety
2800 Woods Hollow Road, Madison WI 53711 USA
Timothy.Hauser**At_Symbol_Here**promega.com | Direct (608) 298-4807 | Cell: (262) 844-1665 | Fax: (608) 277-2677
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 9:40 AM
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 Stuart CIH
Chemical Hygiene Officer
Department of Environmental Health and Safety
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