Nitrogen gas and liquid Nitrogen
GOST 9293-74
(with Modifications 1, 2, 3 approved in December, 1979, September, 1985, and April, 1991)
Nitrogen gas - rare gas, odourless and colourless, with the density of 1,25046 kg/m3 at 0°С and 101,3 kPa. The specific volume of nitrogen gas is 860,4 dm3/kg at the pressure of about 105 Pa and the temperature of 290K.
Liquid nitrogen - colourless and odourless liquid with the boiling-point of -196°С and the pressure of 101,3 кPа and the specific volume of 1,239 dm3/kg at the temperature of -196°С and the pressure of 101,3 кPа.
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Parameter name
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Standard for grade of gaseous and liquid Nitrogen
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Special purity
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Increased purity
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Industrial
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1stgrade
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2ndgrade
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1stgrade
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2ndgrade
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1stgrade
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2ndgrade
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1. Volume ratio of Nitrogen, %, not less than
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99,999
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99,996
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99,99
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99,95
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99,6
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99,0
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2. Volume ratio of Oxygen, %, no more than
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0,0005
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0,001
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0,001
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0,05
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0,4
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1,0
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3. Volume ratio of water steam in gaseous Nitrogen, %, no more than
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0,0007
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0,0007
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0,0015
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0,004
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0,009
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Stands the test as per it. 3.6of GOST 9293-74
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4. Oil content in gaseous Nitrogen
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Not to be determined
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Stands the test as per it. 3.7 of GOST 9293-74
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5. Oil content, mechanical admixtures and moisture in liquid Nitrogen
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Stands the test as per it. 3.8of GOST 9293-74
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6. Volume ratio of Hydrogen, %, no more than
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0,0002
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0,001
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Not standardized
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7. Volume ratio of sum of carbon-bearing compounds in equivalent ofСН4, %, no more than
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0,0003
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0,001
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Not standardized
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Induces of nitrogen produced by the JSC “Shchekinoazot” correspond to the 1st grade of the technical brand of nitrogen gas and liquid nitrogen.
In industry nitrogen is obtained from atmospheric air by means of low-temperature separation.
Fields of nitrogen gas application:
- for creating inert atmosphere at the production, storage and transportation of the easily oxidizable products,
- at high temperature processes of working of the metals that don’t interact with nitrogen,
- for conservation of the secluded metal vessels, conduits and other purposes.
Liquid nitrogen is used as refrigerating medium.
Nitrogen gas is transported in steel cylinders with a capacity of 40 l.
Liquid nitrogen is transported in cylinders, when transported by motor transport it is put in cryogenic tanks, Dewar vessels of any capacity. Vessels with liquid nitrogen, as well as vessels with oxygen, are safe for usage and passed a test on the special equipment.
Guaranteed storage life is 18 months as from the date of production.
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