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. 


Bruce Verhei 

> 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
> craig.pr...@ch2m.com
> http://www.jacobs.com
> From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] 
> On Behalf Of James Crawford
> Sent: Tuesday, February 13, 2018 1:18 PM
> To: sprinklerforum@lists.firesprinkler.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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