![]() ![]() rapid combustions or explosion, may occur if the materials which make contact with the oxygen are combustible. ![]() Similar oxygen enrichment may occur where condensed air accumulates on the exterior of cryogenic piping. Repeated replenishment of the system can thereby cause oxygen to accumulate as an unwanted contaminant. The types of containers in use are the dewar, cryogenic liquid cylinder, and cryogenic storage tank.Ĭryogenic fluids with a boiling point below that of liquid oxygen are able to condense oxygen from the atmosphere. Liquid nitrogen is stored, shipped, and handled in several types of containers, depending upon the quantity required by the user. Personnel, including rescue workers, should not enter areas where the oxygen concentration is below 19.5%, unless provided with a self-contained breathing apparatus or air-line respirator. At low oxygen concentration, unconsciousness and death may occur in seconds and without warning. Death may result from errors in judgment, confusion, or loss of consciousness that prevents self-rescue. Inhalation of nitrogen in excessive amounts can cause dizziness, nausea, vomiting, loss of consciousness, and death. Although nitrogen is nontoxic and inert, it can act as a simple asphyxiant by displacing oxygen in air to levels below that required to support life. Humans possess no senses that can detect the presence of nitrogen. Health EffectsĮxtensive tissue damage or burns can result from exposure to liquid nitrogen or cold nitrogen vapors.īeing odorless, colorless, tasteless, and nonirritating, nitrogen has no warning properties. All cryogenic liquids produce large amounts of gas when they vaporize. Liquid nitrogen has a boiling point of -195.8 ☌ (-320.5 ☏). When nitrogen is converted to liquid form it becomes a cryogenic liquid.Ĭryogenic liquids are liquefied gases that have a normal boiling point below -150 ☌ (-238 ☏). Nitrogen is inert and will not support combustion however, it is not life supporting. Nitrogen makes up the major portion of the atmosphere (78% by volume). Liquid nitrogen is inert, colorless, odorless, non corrosive, nonflammable, and extremely cold. ![]()
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