Subject: Re: [DCHAS-L] FW: Hydrogen
Date: June 3, 2012 3:37:02 AM EDT
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: <ceecrdjbsjfo28mu9gt71x2o.1338665636184**At_Symbol_Here**>

I concur with purchasing pre-mixed gases; gas blending is an art form with a strong unpinning of science.

As for guidance I suggest the CGA pamphlet on Hydrogen and I think there is an NFPA document also. Purchase them and follow them; much less costly than rebuilding a lab or building.





The information contained in this message is privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer.


ACSafety has a new address:



PO Box 152329


011(619) 990-4908 (phone, 24/7)


We no longer support FAX.


Please contact me before sending any packages or courier delivery. The address for those items is:

5340 Caminito Cachorro

San Diego CA 92105


From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Todd Perkins
Sent: Saturday, June 02, 2012 12:34 PM
Subject: Re: [DCHAS-L] FW: Hydrogen


H2/N2 mixtures greater than 5.7% H2 are flammable, therefore a different level of hazard than the 5% mix. In the presence of an ignition source you could have one heck of an explosion.


I would question the.researcher's need for these mixes and the safeguards he will be putting in place.


If you still decide that you want a richer hydrogen mix, I strongly urge you to have it pre-mixed by a specialty gas lab. Our labs at Airgas use a patented Gravimetric system -Accugrav - for custom blends, which I believe is the most accurate in the compressed gas industry.


So again - take a second look at whether thats really what you want/need, what safety measures you will have in place, and if you choose to go forward, have a Spec Gas Lab mix it for you.


There is a lot of danger inherent to using hydrogen, and a lot of potential for harm to the people using it. Please be safe.


Note- In training for your personnel, I would review the hydrogen explosion at University of Missouri last year


Todd Perkins

Regional Safety Director

Airgas USA,LLC

-------- Original message --------
Subject: [DCHAS-L] FW: Hydrogen
From: Wayne Phan <Wayne.Phan**At_Symbol_Here**POMONA.EDU>


A colleague of mine has a question about hydrogen and nitrogen mixture.  Please advise.

See email below.



Hi Wayne, I have a question for you.  I'd like to use 80/20 H2/N2 or other high % mixes of hydrogen.  I have never used more than 5% before.  We would not use it much and would not use large volumes-we would bubble the gas into sealed 100 ml bottles of fluid to equilibrate the gas and that's it (in other words, we would never have hydrogen gas flowing for more than a couple minutes at a time, and in very small amounts).
Any idea where I could look for guidelines, etc?  Thanks, ejc

This message has been scanned by Postini anti-virus software.

Previous post   |  Top of Page   |   Next post

The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.