After the West Texas fertilizer explosion

[Rod.H]

Fair enough, as ammonium nitrate were I'm at, is now considered a restricted substance in concentrations over 45% and all I can find so far on it's safe storage is: less than 3kg minimal issues, but have a bucket of water or water-based fire extinguisher handy; 100kg to 50 tonnes, a fire hose is all ya need but you should be storing and treating it like a high explosive; over 50 tonnes, add more fire hoses; 500 tonnes - whilst you might have enough fire fighting equipment handy, if the fire's not controllable and you're within 150 meters, be somewhere else!