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Ethanol storage limits

We are building our CO2 extraction lab from the ground up. For the winterization process after extraction, my building plan was to have a 55 gallon drum of Ethanol in the lab with a pump dispenser mounted on it. The spent alcohol would be placed in an empty 55 gallon drum. The engineer working on the specs of the building is telling me that 55 gallons of ethanol will bump the building up to a class 1 Div 1 Classification. I have asked what the regulations are and I will conform but he says he can't tell me. Is 55 gallons too much? Can I have less than 30 gallons? Curious if other labs have run into this issue.


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