SAFETY
Handling Liquid
Nitrogen
Nitrogen is a colorless, odorless, and tasteless gas. Liquid nitrogen (LN2) is a potential asphyxiate and may
cause severe frostbite. Please observe all proper safety precautions to ensure proper handling of LN2.
Consult your local LN2 dealer for detailed handling instructions.
Cryogenic liquid containers (dewars) must be operated in accordance with the manufacturer’s instructions.
Dewars must be kept in a well-ventilated space where they are protected from the weather and are away from
any sources of heat.
Nitrogen is a potential asphyxiate and can cause rapid suffocation without warning. Store and use it in area
with adequate ventilation. DO NOT vent the container or system in confined spaces. DO NOT enter confined
spaces where gas may be present unless the area has been well ventilated. If inhaled, remove to fresh air. If
not breathing, give artificial respiration. If breathing is difficult, supplemental oxygen may be required. SEEK
MEDICAL ATTENTION IMMEDIATELY.
LN2 can cause severe frostbite to the eyes or skin. DO NOT touch frosted pipes, hose assemblies or valves. In
case of frostbite, consult a physician at once. If a physician is not readily available, warm the affected areas
with water that is near body temperature.
Never place LN2 in a sealed container without a pressure relief device. The expansion of LN2 to N2 gas is
approximately 1 to 700. When handling LN2, the most important safety aspects to consider are adequate
ventilation and eye and skin protection. Although nitrogen gas is non-toxic, it is dangerous in that the gas will
displace the oxygen in ambient air. Therefore, it is imperative that cryogenic supply and storage dewars be
stored and operated in open and well-ventilated areas. Oxygen Deficiency Monitoring Equipment should be
used in areas where use of LN2 poses the risk of creating an oxygen deficient atmosphere. Never enter a space
where oxygen deficiency is detected.
Persons transferring LN2 should make every effort to protect the eyes and skin from accidental contact with liquid
or cold gas. Protect the eyes with a full-face shield. Safety glasses are not adequate. Always wear cryogenic
gloves or equivalent when handling anything that is or may have been in contact with the liquid, cold gas, cold
pipes, or cold equipment. Long sleeve shirts and trousers without cuffs that are of sufficient length to prevent
liquid from entering the shoes are recommended.
Notice
The CryoWiz™ is intended for low pressure 22 to 35 PSIG Cryogenic Liquid Nitrogen Applications
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