2023 07 17 Compressed Gases
•Definition of a
compressed gas –
any gas, or mixture
of gases, that is
pressurized and
contained in a
cylinder or tank.
•Examples of compressed gases
•acetylene
•anhydrous ammonia
•carbon dioxide
•helium
v
•Types of containers
in which compressed
gas is stored
•Definition of a cryogenic liquid - matter that exists at minus 200 degrees Celsius
•
•Examples of cryogenic liquids
•liquid nitrogen
•liquid argon
liquid oxygen
Handling and inspection procedures
•Ensure gas
containers are
identified with a
DOT label
•
•Cylinders must
never be
dropped, slid,
or rolled
•Use carts or other material handling equipment to move cylinders
•Tanks must be secured to cart
•Regulators, pressure
relief devices, valves,
and hoses must be
designed for the
specific container
•Never interchange equipment between different types of gases
•
•Pressure relief devices maintain
pressure in
cylinder at
a desired
level
•Never interchange equipment between different types of gases
•
•Pressure relief devices maintain
pressure in
cylinder at
a desired
level
•Inspect cylinders and devices, and remove defective equipment from service
•
•Inspect threads on valves and regulators for
damage, dirt,
grease, and oil
•Threads on regulators and auxiliary equipment must match the container valve
threads - adapters
are not allowed
•
•Connections must
not be tampered
with, or forced
together
•Threads on regulators and auxiliary equipment must match the container valve
threads - adapters
are not allowed
•
•Connections must
not be tampered
with, or forced
together
•Valves should be opened slowly, with valve outlets pointed away from the user and other persons
•
•Valves should be
opened with the
wrench supplied
by the vendor
•Valves should not be hammered open or closed
•Containers must be stored upright and not left on rolling cart
•
•Storage areas must
be well-ventilated
•
•Avoid storage
temperatures
above 125 degrees
Fahrenheit
Storage procedures
•Post the names of the gases in the storage area
•
•Keep valve caps on containers when not
connected to
dispensing
equipment
•Post the names of the gases in the storage area
•
•Keep valve caps on containers when not
connected to
dispensing
equipment
•Keep compressed gases away from fires, flames, and welding torches
•When containers are in storage, remove:
•regulators
•cylinder connections
•hose lines
•similar auxiliary devices
•Store oxygen away from flammable gas containers and combustibles
•20-foot rule
•non-combustible
5-foot high
barrier
•Ensure that the storage area is:
•properly labeled
•secure
•away from ignition
sources
•separate from
oxidizing
gases
•
•Types of containers
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