From: Sujit Sengupta <admiradhes**At_Symbol_Here**GMAIL.COM>
Subject: Re: [DCHAS-L] FW: Hydrogen
Date: June 2, 2012 11:43:37 PM EDT
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: <ceecrdjbsjfo28mu9gt71x2o.1338665636184**At_Symbol_Here**>

The following advise is absolutely right
We should not go above 1.5% H2 to be absolutely safe.
The mixing should be done in a accredited gas lab
and there should be a documented and reviewed safety plan in place
Sujit Sengupta

On Sat, Jun 2, 2012 at 3:33 PM, Todd Perkins <p3wt3r**At_Symbol_Here**> wrote:
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

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