BT- 434 Rev.A
4
WARNING
Extreme Cold - Cover Eyes and Exposed Skin
Accidental contact of liquid oxygen 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 equipment, or the cold gas exists. Safe-
ty goggles or a face shield should be worn if liquid ejection or splashing may
occur or cold gas may issue forcefully from equipment. Clean, insulated gloves
that can be easily removed and long sleeves are recommended for arm protec-
tion. Cuffless trousers should be worn outside boots or over the shoes to shed
spilled liquid. If clothing should be splashed with liquid oxygen or otherwise
saturated with the gas, air out the clothing immediately, removing it if possible.
Such clothing will be highly flammable and easily ignited while the concentrat
-
ed oxygen remains, and should not be considered safe for at least 30 minutes.
Replacement Parts Must be Suitable for Oxygen Service
Many materials, especially some non-metallic gaskets and seals, constitute a
combustion hazard when in oxygen service, although they may be acceptable for
use with other cryogenic liquids. Make no substitutions for recommended spare
parts. Also, be sure all replacement parts are thoroughly “Cleaned For Oxygen
Service” in accordance with Compressed Gas Association (CGA) Pamphlet G-4.1
“Cleaning for Oxygen Service” or equivalent industrial cleaning specifications.
Observe Safety Codes When Locating Oxygen Equipment
Before locating oxygen equipment, become thoroughly familiar with National
Fire Protection Association (NFPA) Standard No. 50, “Bulk Oxygen Systems”,
and with all federal, state and local safety codes. The NFPA Standard covers
the general principles recommended for the installation of bulk oxygen sys-
tems on industrial and institutional consumer premises.
Safety Precautions for Liquid Nitrogen
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 con-
tact with the liquid, cold pipes and equipment, or the cold gas exists. Safety gog-
gles or a face shield should be worn if liquid ejection or splashing can occur or
cold gas can issue forcefully from equipment. Insulated gloves that can be easily
removed and long sleeves are recommended for arm protection. Trousers with-
out cuffs should be worn outside boots or over the shoes to shed spilled liquid.
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.