fume hood clearance

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reclaim255

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Pittsburgh, PA
A fume hood for evaporting IPA (isopropanol) is proposed for my facility.
IPA is listed at an NFPA rating of 3 -flammable. Approximately 1 gallon of the IPA is evaporated in a 24 hour period. Explosion proof receptacles and lighting will be installed in the hood. A hot plate will provide the heat source for evaporation.
An exisiting electrical service panel (supplies 240V power for machinery) is situated on the same outside wall as the proposed hood. Both are in a framed enclosure (6'W x 10'L) Is there a minimum clearance to observe between the hood and electrical subpanel?
 
Will the service panel and the hood be in the same enclosure? What is the ventilation method? May we assume the hood will exhaust well way from the enclosure?

I'll probably think of a few more questions.
 
Bob,
Thanks you for the reply.
The service panel and fume hood will be in the same enclosure. This is a walled in structure (approximately 10' x 6') within a 2500 sq ft bldg. The fume hood will be ducted and vented as high as possible through the outside wall via a Harvey blower mounted at the top of the plenum where the vent enclosure meets the duct work.
Air exchange in the room is expected to be at least 4 changeouts per hour
The planned hood is 6 ft long and the proposed installation will be
within a foot of the electrical service panel's side due to size limitations.
My concern as Safety Officer is that the proximity of the hood to the panel may not conform to code.As I will have to approve the plan, I want the bid spec to indicate the correct parameters.
Ernie Robb
Safety Officer
 
The generally applicable Standard is NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals. The document covers explosion hazard requirements (Chapter 7), laboratory ventilating and hood requirements (Chapter 8) and other relevant subjects. It also references several other relevant Standards such as NFPA 496.

Without doing a full design review it is impossible to answer your basic questions definitively. I have a modest concern about the common enclosure and the ventilation rate seems a bit low. I would recommend having a qualified engineer conduct the design review.
 
Information Sufficient To Proceed

Information Sufficient To Proceed

Bob,
Thanks for the reply. I believe this suppplies enough information for me to obtain the reqired information.
Ernie
 
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