Trying to help a friend of a friend. Has anyone ever provided any type of fire suppression system for underground storage of ANFO (Ammoniun Nitrate and fuel oil mixture)? The area in question is in a limestone mine underground. The space is pretty large and has 30' ceilings so I'm guessing that chemical suppression is not going to be an option. I tend to believe that sprinklers may not be the route to go. Water will apparently render the ANFO inert but in case of a fire I'm not sure that the sprinklers could operate fast enough to provide any real protection. Additionally, the water supply is inadequate for almost any type of sprinkler system anyway.
I'm not really finding much in NFPA except Annex C in NFPA 495 which refers to separation distances. I did find a reference to NFPA 490 2002 Edition but cannot find a current code so I'm guessing it was folded into 495 at some point. Any direction at all would be appreciated to help me in my research. Chris Dorn Dorn Fire Protection LLC
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