From: "paracelcusbombastusvon**At_Symbol_Here**" <paracelcusbombastusvon**At_Symbol_Here**JUNO.COM>
Subject: Re: [DCHAS-L] Liquid nitrogen storage
Date: March 8, 2013 2:42:10 PM EST
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: <20130308.134210.16815.0**At_Symbol_Here**>

We have a liquid CO2 system with an enclosed pump house. The pump house has a CO2 monitor piped into it with the meter outside the entrance door. Policy is the meter is monitored before entering the pump house and the levels must be below 1000ppm before entering.

One exchange is quite low. You could install an O2 monitor similarly and possibly interlock it with the door so that the room could not be entered unless the O2 levels were above 21%. Also install a fan controlled remotely to ventilate at a higher level before entry.

Lynn Knudtson

---------- Original Message ----------
From: Ralph B Stuart
Subject: [DCHAS-L] Liquid nitrogen storage
Date: Fri, 8 Mar 2013 15:40:28 +0000

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

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