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From: "Bell,Martin" <mwb32**At_Symbol_Here**drexel.edu>
Subject: Re: [DCHAS-L] 4% vs. 5% hydrogen
Date: Wed, 6 Jun 2018 13:15:48 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: A12189CB-417F-4B33-9D1E-F9172C95478A**At_Symbol_Here**drexel.edu
In-Reply-To


Debbie


Purdue University has a good explanation. See the link. 

https://engineering.purdue.edu/ChE/aboutus/safety/documents/hydrogen-use-guidelines-october-2011.pdf


Martin W. Bell, M.S. CIH CSP 

Director, Environmental Compliance

Department of Environmental Health and Safety

 

Drexel University

400 North 31st Street

Philadelphia, PA 19104

Tel: 215.895.5892 | Fax: 215.895.5926

Mobile: 215-778-4278

drexel.edu/facilities/healthsafety


On Jun 5, 2018, at 8:35 PM, Debbie M. Decker <dmdecker**At_Symbol_Here**UCDAVIS.EDU> wrote:

Hi all:

 

Riddle me this - why is 5% hydrogen in nitrogen considered NOT flammable and 4% in argon considered flammable?  Tried to reach Praxair but no one is home.

 

This makes absolutely no sense to me.

 

Thanks,

Debbie

 

Debbie M. Decker, CCHO, ACS Fellow

Past Chair, Division of Chemical Health and Safety

Councilor and Programming Co-Chair

University of California, Davis

(530)754-7964

(530)304-6728

dmdecker**At_Symbol_Here**ucdavis.edu

 

Birkett's hypothesis: "Any chemical reaction

that proceeds smoothly under normal conditions,

can proceed violently in the presence of an idiot."

 

 

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