NFPA 490 applies to the storage of ammonium nitrate in the form of crystals, flakes, grains, or prills including fertilizer grade as defined by Definitions and Test Procedures for Ammonium Nitrate Fertilizer, dynamite grade, nitrous oxide grade as defined by Standard for Ammonium Nitrate (Nitrous Oxide Grade), technical grade, and other mixtures containing 60 percent or more by weight of ammonium nitrate.
This Code gives requirements for storage structures, storage in containers and bulk storage, and separation from contaminants. Additionally, this document covers section fire protection and general safety precautions including housekeeping and material handling. (Approx. 11 pp., 2002)