(+62) 778 392 900

Liquid Nitrogen

Liquid nitrogen is inert, colorless, odorless, noncorrosive, nonflammable, and extremely cold. Nitrogen makes up the major portion of the atmosphere (78.03% by volume, 75.5% by weight). Nitrogen is inert and will not support combustion; however, it is not life supporting.

Nitrogen is inert except when heated to very high temperatures where it combines with some of the more active metals, such as lithium and magnesium, to form nitrides. It will also combine with oxygen to form oxides of nitrogen and, when combined with hydrogen in the presence of catalysts, will form ammonia.

Since nitrogen is noncorrosive, special materials of construction are not required to prevent corrosion. However, materials of construction must be selected to withstand the low temperature of liquid nitrogen. Vessels and piping should be designed to American Society of Mechanical Engineers (ASME) specifications or the Department of Transportation (DOT) codes for the pressures and temperatures involved.

Although used more commonly in the gaseous state, nitrogen is commonly stored and transported as a liquid, affording a more cost-effective way of providing product supply.

Liquid nitrogen is a cryogenic liquid. Cryogenic liquids are liquefied gases that have a normal boiling point below –130°F (–90°C). Liquid nitrogen has a boiling point of –320°F (–196°C). The temperature difference between the product and the surrounding environment, even in winter, is substantial. Keeping this surrounding heat from the product requires special equipment to store and handle cryogenic liquids.

A typical system consists of the following components: a cryogenic storage tank, one or more vaporizers, and a pressure and temperature control system. The cryogenic tank is constructed like, in principle, a vacuum bottle. It is designed to keep heat away from the liquid that is contained in the inner vessel. Vaporizers convert the liquid nitrogen to its gaseous state. A pressure control manifold controls the pressure at which the gas is fed to the process. Processes that use nitrogen as a liquid do not require the vaporizers and pressure control manifold.

Liquid Nitrogen Physical and Chemical Properties

  • Molecular Weight: 28.01
  • Boiling Point @ 1 atm: -320.5°F (-195.8°C, 77oK)
  • Freezing Point @ 1 atm: -346.0°F (-210.0°C, 63oK)
  • Critical Temperature: -232.5°F (-146.9°C)
  • Critical Pressure: 492.3 psia (33.5 atm)
  • Density, Liquid @ BP, 1 atm: 50.45 lb/scf
  • Density, Gas @ 68°F (20°C), 1 atm: 0.0725 lb/scf
  • Specific Gravity, Gas (air=1) @ 68°F (20°C), 1 atm: 0.967
  • Specific Gravity, Liquid (water=1) @ 68°F (20°C), 1 atm: 0.808
  • Specific Volume @ 68°F (20°C), 1 atm: 13.80 scf/lb
  • Latent Heat of Vaporization: 2399 BTU/lb mole
  • Expansion Ratio, Liquid to Gas, BP to 68°F (20°C): 1 to 694


The image below shows a typical cryogenic liquid cylinder.

Cryogenic liquid cylinders are insulated, vacuum-jacketed pressure vessels. They come equipped with safety relief valves and rupture discs to protect the cylinders from pressure build-up.

These containers operate at pressures up to 350 psig and have capacities between 80 and 450 liters of liquid.

Product may be withdrawn as a gas by passing liquid through an internal vaporizer or as a liquid under its own vapor pressure.

Liquid Nitrogen Storage Tank at BatamLiquid Nitrogen Storage Tank at Batam
Liquid Nitrogen Cryogenic at BatamLiquid Nitrogen Cryogenic at Batam