Date: Tue, 13 Apr 2010 14:21:24 -0500
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Cook, Ray" <rlcook**At_Symbol_Here**MARATHONOIL.COM>
Subject: Re: Explosion Proof Refrigerators
As I understand the definitions, explosion-proof electrical equipment must be able to internally withstand an explosion without failing, resulting in an ignition source in the environment.

Intrinsically safe electrical equipment has insufficient energy to ignite an otherwise flammable atmosphere.

Regards, Ray - from my BB 


From: DCHAS-L Discussion List  
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU  
Sent: Tue Apr 13 14:06:34 2010
Subject: Re: [DCHAS-L] Explosion Proof Refrigerators 

I have a similar discussion with sales rep from Fisher. They are making the distinction between "flammable material storage" and "explosion proof" refrigerators. Usually any explosion proof equipment have to be installed in an "explosion proof" environment. i.e. that all eletrical devices and setup have to be rated "explosion proof" as well. This have to do with the building code that may vary with the regions, states or provinces. 

Hope this help 

Pierre Chantal
Section Head-Chemistry
Product Safety Laboratory
1800 Walkley road
Ottawa, On, K1A0K9

Sent by: DCHAS-L Discussion List  

2010-04-13 01:21 PM 
Please respond to
DCHAS-L Discussion List 

[DCHAS-L] Explosion Proof Refrigerators


I have a question about "explosion proof" or "explosion resistant" refrigerators/freezers.  Where is the best place to put one in a lab? Where are places to avoid putting them in a lab? What kind of ignitions sources should be avoided and how far away from these sources can the flammable or explosion proof refrigerator be safely installed? Do we have to worry about nearby lights and electrical outlets?

Another question that has come up for us is this: if the MSDS sheet states that mechanical ventilation is needed for a flammable solvent, does Cal OSHA mandate that this MSDS be followed? Obviously, for safety reasons we should, but we are having trouble getting our facilities people to understand this. The only thing they understand is when we say "it's the law".  We are purchasing new stand-alone flam cabinets and we would like mechanical ventilation, but they don't want to go to the trouble and expense. Currently, the only mechanically ventilated flam cabinets we have are the small ones underneath fume hoods. These are in the teaching labs and they have no locks, so we are hesitant about using them to store larger quantities of flammable solvents.

Thanks for any help!

Marjorie Samples
Chemistry Dept.
Folsom Lake College 


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