From: Eugene Ngai <eugene_ngai**At_Symbol_Here**COMCAST.NET>
Subject: Re: [DCHAS-L] benchmarking O2 monitoring with cryogen use
Date: Wed, 2 Jun 2021 15:20:02 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: 015e01d757e4$5649b4f0$02dd1ed0$**At_Symbol_Here**comcast.net
In-Reply-To


Location, location, location! If you determine that these are required, location is absolutely critical. Cold cryogen vapors are heavier than air, O2 deficiency will be at floor level. I have seen facilities that have them located in the ceiling because its convenient. They should be close to the breathing zone to be effective. Deadzones in a room are also a no no. Do some smoke testing to see what the typical air currents are

 

Eugene Ngai

Chemically Speaking LLC

www.chemicallyspeakingllc.com

 

 

 

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Shannon Nephew
Sent: Wednesday, June 2, 2021 3:01 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] benchmarking O2 monitoring with cryogen use

 

We have oxygen monitors (PureAire monitors) in our NMR facility and in our gas cylinder tank room.  Never any issues so far, but the peace of mind is definitely reassuring.  

They weren't super expensive and the customer support was great.

 

Shannon


SHANNON C. NEPHEW, 

MS, CSM

Chemical Hygiene Officer, Hudson Hall Science Complex Building Manager

Science Programs and Facilities Support Professional

Hudson Hall 317

101 Broad Street
Plattsburgh, NY 12901

plattsburgh.edu

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SUNY Plattsburgh Logo

 

 

On Wed, Jun 2, 2021 at 2:28 PM Stuart, Ralph <Ralph.Stuart**At_Symbol_Here**keene.edu> wrote:

> >In my experience, except for very small laboratories, or those with very low exhaust rates (like SEM labs) oxygen monitoring is not required unless the owners try to stack a 10 day supply of cryogens on hand at all times.

Or if they are storing dry ice or liquid nitrogen in a cold room, assuming that that location will extend the life of their stockpile of those items. (Fresh air in cold rooms is 0%.) We have found 16% O2 levels in those situations.

- Ralph

Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
603 358-2859

ralph.stuart**At_Symbol_Here**keene.edu

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