Quantity of indoor storage of Class III-B Combustible Liquids is not limited in
an NFPA 13 protected building. You aren’t even required to have normal vents or
relief go to the exterior. 2015 IFC.
Craig asked a few more questions. I wouldn’t even start a review yet. Fire plan
reviewers get to ask a lot of questions. I’d want to understand the process.
One question I’d have would be about points in operations cycle with a small
amount of water in tank. I’d never want my FF’s involved in a situation where
water at bottom of tank boiled. This is the final link in boilover event in
crude oil tanks.
> On Feb 13, 2018, at 10:53, Prahl, Craig/GVL <Craig.Prahl@ch2mcom> wrote:
> The grease and oils are hydrocarbons and will not mix with water. The water
> will separate out and depending on where a leak would occur in the tank, your
> spill could be wholly combustible in nature. Typically these are Class IIIB
> combustible liquids.
> IF you are following NFPA 13, I would not do less than EHII. Also take a
> look at NFPA 30 for indoor storage tanks.
> Oil and grease fires can be difficult to control with water alone. With a
> 32,000-gallon tank and 20% (6300 gallons being a combustible liquid) I’d be
> talking with the local fire department to be sure they are equipped for such
> a fire or you may need to provide a foam-water sprinkler system.
> Other questions, what is the storage tank made of, steel or plastic? What
> chemical is used for cleaning the tank and piping systems, any solvent
> materials? How is the transfer from truck/tank to bldg./tank performed?
> What is the potential fire hazard there and how is that mitigated?
> Craig L. Prahl
> Fire Protection Group Lead/SME
> Direct - 864.920.7540
> Fax - 864.920.7129
> Direct Extension 77540
> CH2M is now Jacobs.
> 200 Verdae Blvd.
> Greenville, SC 29607
> From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org]
> On Behalf Of James Crawford
> Sent: Tuesday, February 13, 2018 1:18 PM
> To: firstname.lastname@example.org
> Subject: Tank Storage [EXTERNAL]
> I was asked to do a review of a building that collects waste from commercial
> grease traps. They take this waste back to their warehouse and put it in
> large tanks (120,000 liters) to allow separation. 75% water, 20% vegetable
> oils and animal fats, 5% solids.
> Once separated the waste materials are then disposed of separately.
> I am trying to classify the mixture that is stored in the tanks, but can find
> no direction in NFPA #13, but due to the concentration of water to oils I am
> leaning toward a non-combustible liquid. But that being said I can find no
> direction on tank storage for a non-combustible liquid.
> Any help out there
> Thank you
> James Crawford
> Phaser Fire Protection Ltd.
> Phone 604-888-0318
> Fax 604-888-4732
> Cel 604-790-0938
> Email jcrawf...@phaserfire.ca
> Web www.phaserfire.ca
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