Filter
Top Products
TW-357 REV E
4
WARNING
The following safety precautions are for your protection. Before installing, operating, or maintaining this unit
read and follow all safety precautions in this section and in reference publications. Failure to observe all
safety precautions can result in property damage, personal injury, or possibly death.
Safety Precautions for Liquid Nitrogen
Nitrogen is an inert, colorless, odorless, and tasteless gas making up four-fifths of the air you breathe. Liquid
nitrogen is obtained by cooling air until it becomes a liquid and then removing the oxygen. Air is roughly
one-fifth oxygen. Liquid nitrogen is at a temperature of -320°F (-196°C) under normal atmospheric pressure.
Extreme Cold - Cover Eyes and Exposed Skin
Accidental contact of liquid nitrogen or cold issuing gas with the skin or eyes may cause a freezing injury
similar to frostbite. Handle the liquid so that it won't splash or spill. Protect your eyes and cover the skin
where the possibility of contact with the liquid, cold pipes and cold equipment, or cold gas exists. Safety
goggles or a face shield should be worn when operating this equipment. Insulated gloves that can be easily
removed and long sleeves are recommended for arm protection. Trousers without cuffs should be worn
outside boots or over the shoes to shed spilled liquid.
Keep Equipment Area Well Ventilated
Although nitrogen is non-toxic and non-flammable, it can cause asphyxiation in a confined area without
adequate ventilation. Any atmosphere not containing enough oxygen for breathing can cause dizziness,
unconsciousness, or even death. Nitrogen, a colorless, odorless, and tasteless gas, cannot be detected by the
human senses and will be inhaled normally as if it were air. Without adequate ventilation, the expanding
nitrogen will displace the normal air resulting in a non-life-supporting atmosphere.
Liquid Nitrogen System
The liquid nitrogen supply pressure at the inlet to the refrigerator should be in the range of 10 psig (0.7bar/69
kPa) to 20 psig (1l4bar/138 kPa) for optimum performance. Higher operating pressures will increase transfer
losses and create excessive turbulence of the liquid in the refrigerator which can generate false signals to the
liquid level controller causing the refrigerator to under-fill. In “liquid phase” storage applications, excessive
turbulence can cause splashing which could result in personal injury and/or damage to the refrigerator. When
installing piping or fill hose assemblies, make certain a suitable safety relief valve is installed in each section
of plumbing between shut-off valves. Trapped liquefied gas will expand greatly as it warms and may burst
hoses or piping causing damage or personal injury. A relief valve is installed in the refrigerator plumbing to
protect the line between the customer supplied shut-off valve and the refrigerator solenoid valve.
CAUTION: When installing field fabricated piping, make certain a suitable safety valve is installed
in each section of piping between shut-off valves.
For more detailed information concerning safety precautions and safe practices to be observed when handling
cryogenic liquids consult CGA pamphlet P-12 "Handling Cryogenic Liquids" available from the Compressed
Gas Association, 1235 Jefferson Davis Highway, Arlington, VA 22202.
Warning: Inlet pressure should not exceed 22 psig (1.5bar/152 kPa). Higher pressures could result in
damage to equipment.