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<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: email@example.com 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<mailto:jcrawf...@phaserfire.ca> Web www.phaserfire.ca<http://www.phaserfire.ca>
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