Compressed Gases

1
Compressed Gases
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Compressed gas description

• Definition of a compressed gas - any gas, or
  mixture of gases, that is pressurized and
  contained in a cylinder or tank.

1a
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Compressed gas description

• Examples of compressed gases
• Acetylene
• Anhydrous ammonia
• Carbon dioxide
• Helium
• Types of containers in which compressed gas is
  stored

1b
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Cryogenic liquids

• Definition of a cryogenic liquid - matter that
  exists at minus 200 degrees Celsius
• Examples of cryogenic liquids
• Liquid nitrogen
• Argon
• Liquid oxygen

2a
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Handling and inspection procedures

• Ensure gas containers are identified with a DOT
  or TC label
• Cylinders must never be dropped, slid, or rolled

3a
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Handling and inspection procedures

• Use carts or other material handling equipment to
  move cylinders
• Regulators, pressure relief devices, valves, and
  hoses must be designed for the specific container

3b
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Handling and inspection procedures

• Never interchange equipment between different
  types of gases
• Pressure relief devices maintain pressure in
  cylinder at a desired level

3c
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Handling and inspection procedures

• Inspect cylinders and devices, and remove
  defective equipment from service
• Inspect threads on valves and regulators for
  damage, dirt, grease, and oil

3d
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Handling and inspection procedures

• 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

3e
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Handling and inspection procedures

• 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

3f
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Handling and inspection procedures

• Valves should not be hammered open or closed

3g
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Storage procedures

• Containers must be stored upright
• Storage areas must be well-ventilated
• Avoid storage temperatures above 125 degrees
  Fahrenheit

4a
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Storage procedures

• Post the names of the gases in the storage area
• Keep valve caps on containers when not connected
  to dispensing equipment

4b
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Storage procedures

• Keep compressed gases away from fires, flames,
  and welding torches

4c
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Storage procedures

• When containers are in storage, remove
• Regulators
• Cylinder connections
• Hoselines
• Similar auxiliary devices

4d
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Storage procedures

• Store oxygen away from flammable gas containers
  and combustibles
• 20-foot rule
• Non-combustible 5-foot high barrier

4e
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Storage procedures

• Ensure that the storage area is
• properly labeled
• secure
• away from ignition sources
• separate from oxidizing gases
• Types of containers in which cryogenics are stored

4f
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Compressed gas hazards

• Inert gases
• Oxidizing gases
• Fire hazards of flammable compressed gases

5a
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Compressed gas hazards

• Health hazards of poison gases
• Corrosive gases
• Other hazards

5b
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Cryogenic liquid hazards

• Extreme cold temperatures
• Asphyxiation
• Splashing and boiling during transfer

6a
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Personal protective equipment

• Eye and face protection
• Gloves
• Aprons
• Foot protection

7a