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Subject: Re: [DCHAS-L] Liquid nitrogen storage
Date: Friday, January 19, 2018 at 5:07:45 PM
Author: "Chance, Brandon" <bchance**At_Symbol_Here**MAIL.SMU.EDU> 		Next by Date:
Subject: Fwd: [DCHAS-L] [CHMINF-L] Google Memory Loss
Date: Sun, 21 Jan 2018 07:24:26 -0600
Author: Ralph Stuart

From: Jeffrey Lewin <jclewin**At_Symbol_Here**MTU.EDU>
Subject: Re: [DCHAS-L] Liquid nitrogen storage
Date: Fri, 19 Jan 2018 22:12:22 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: CAEwQnqhCOCy1z891G5AvL0xvviehtn=r2EeW6U93HHE_t316tw**At_Symbol_Here**mail.gmail.com
In-Reply-To <3696a28c7a9a4b8ca87d089ba460ac53**At_Symbol_Here**WinEx15Mbx05.SHSU.EDU>


Just some quick thoughts you should consider:

Are they storing in fixed tanks, portable liquid cylinders, or dewars?

How big are they?

How big is the room?

Are they dispensing or using for cold storage?

Have you done back of the envelope calculations to determine the concentration during a catastrophic release? For a small spill?

I've been working with one lab being fed with a 1500 gallon tank (tank is outside) for cooling then vented back outside and the vendor recommended that we install an O2 sensor.

I'm also aware of a smallish electron microscope lab that uses 100-gallon cylinders that, after doing spill calculations, also had a sensor installed.

We did spec sensors into our new Chemistry Stores addition in the LN dispensing room.

The biology labs with 20L dewars being used for cold storage typically don't.

Jeff





On Fri, Jan 19, 2018 at 3:48 PM Battles, Paul <pmb024**At_Symbol_Here**shsu.edu> wrote:

Hello All,

We are in the process of building a new biology building and one of the labs will regularly contain a liquid nitrogen tank. Are oxygen depletion sensors required? The only thing I have come across said "recommended if room doesn't have adequate ventilation."

Thanks,

Paul Battles

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--
Jeff Lewin
Chemical Safety Officer
Compliance, Integrity, and Safety
Environmental Health and Safety
Michigan Technological University
Houghton, MI 49931

O 906-487.3153
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