26 Ammonium nitrate or ammonium nitrate mixed fertilizers containing residual process heat and having a temperature exceeding 130°F shall not be accepted for storage in a storage facility subject to these Regulations.
(6) Ammonium nitrate or ammonium nitrate mixed fertilizers in bags or bulk shall not be stored in contact with hot pipes, conduits, ducts, light bulbs or any other object with a surface temperature exceeding 100°F and should be stored at least 30 inches from such objects.
2 The principal properties and hazards of ammonium nitrate are as follows:
(a) ammonium nitrate is an oxidizing material that, at elevated temperatures, will support the combustion of materials such as wood, paper, fuel oil and sulphur; but self-sustaining burning reactions are not usually obtained unless more than one per cent of combustible material is present;
(b) ammonium nitrate undergoes thermal decomposition when heated to temperatures above about 150°F and, under certain conditions, some of which are mentioned below, this decomposition may become dangerous; because ammonium nitrate is usually stored in very large quantities, it has the potential to escalate an ordinary fire into an event approaching disaster proportions and for this reason, even a very small probability of occurrence cannot be ignored;
2 In these Regulations,
ordinary location means a location in which electrical equipment, under normal conditions of use, is not unduly exposed to damage from mechanical causes, excessive dust, moisture, extreme temperatures or corrosive, flammable or explosive atmospheres; (emplacement ordinaire)