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Anhydrous ammonia is a colorless, corrosive chemical that is lighter than air, extremely soluble in water, and has a piercing odor that is highly irritating. You are probably familiar with household ammonia, which is dissolved in water. In contrast, anhydrous ammonia is pure ammonia that is not mixed with water. Liquid anhydrous ammonia is a gas that is compressed into a liquid, has all of the hazards of ammonia, but also has the hazards of a compressed gas.
Anhydrous ammonia is widely used as a fertilizer and refrigerant.
OSHA’s standard on anhydrous ammonia applies to the design, construction, location, installation, and operation of anhydrous ammonia systems including refrigerated ammonia storage systems. This standard does not apply to:
Employers must: