Purge 5 : General.The replacement of a flammable, indeterminate, or high-oxygen-bearing atmosphere with another gas that, when complete, results in a nonflammable final state
NFPA 86C Standard for Industrial Furnaces Using a Special Processing Atmosphere, 1999 ed. (Std: Ind Furnaces Using a Special Procss Atm - Amer) {231 NFC}