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Previous by Date: Subject: Re: [DCHAS-L] FW: Hydrogen Date: June 2, 2012 11:43:37 PM EDT Author: Sujit Sengupta |
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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.
Neal
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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
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
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>
To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
CC:
Hello,
A colleague of mine has a question about hydrogen and nitrogen mixture.
Please advise.
See email below.
Thanks,
Wayne
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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