From:
Margaret Rakas <mrakas**At_Symbol_Here**SMITH.EDU>
Subject:
[DCHAS-L] Hydrogen Gas Safety
Date:
Feb 21, 2025 15:18 UTC
Reply-To:
ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID:
<CAAszpkwm=Y=FH4mevV4WpoKw5xEqD=RXUCMvALW6qOiW1TGAzw**At_Symbol_Here**mail.gmail.com>
In-Reply-To:
Good morning-
We have 3 different cylinders of hydrogen in use in one lab (different grades for different pieces of equipment ) and have the following questions (I've searched the web but am not sure what is done with relatively small amounts of hydrogen versus a lab that has higher number in use or a 'tank farm' setup.
1) Do you routinely use excess flow shutoff valves? We do have flame arrestors in line with each regulator....
2) How long are regulators (for inert gases as well as hydrogen) used before refurbishing or replacement? Apparently hydrogen gas can embrittle metals...
3) If you send them out for refurbishment I would be interested in knowing where, and how you know their initial age?
thanks very much!
Margaret
-- Margaret A. Rakas, Ph.D.
Lab Safety & Compliance Director
Clark Science Center
Smith College
413-585-3877 (p)
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