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Previous by Date: Subject: Re: [DCHAS-L] benchmarking O2 monitoring with cryogen use Date: Wednesday, June 2, 2021 at 2:28:20 PM Author: "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>

Next by Date: Subject: Re: [DCHAS-L] benchmarking O2 monitoring with cryogen use Date: Wed, 2 Jun 2021 15:00:59 -0400 Author: Shannon Nephew

Completely agree which is why I always recommend specifying at least 1
CFM/SF or exhaust per cold room (or hot room) with a 500 CFM minimum if at
all possible. (Just means you need to buy one with a slightly higher heating
or cooling capacity.) I have seen issues in even when there is no dry ice or
liquid nitrogen stored. The release from samples over time can become
worrisome. And if you get a failure and the room warms up then everyone runs
out and puts in dry ice leading to a real hazard.

Richard Palluzi
PE, CSP

Pilot plant and laboratory consulting, safety, design, reviews, and training
www.linkedin.com/in/richardppalluzillc/

Richard P Palluzi LLC
72 Summit Drive
Basking Ridge, NJ 07920
rpalluzi**At_Symbol_Here**verizon.net
908-285-3782

-----Original Message-----
From: ACS Division of Chemical Health and Safety On
Behalf Of Stuart, Ralph
Sent: Wednesday, June 2, 2021 2:28 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] benchmarking O2 monitoring with cryogen use

> >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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