Compressed gases
This video is a supplement to site-specific training. The quiz is to be marked by the
supervisor of your lab.
Safe handling of gas cylinders
Types of gases
1) Permanent gases eg, nitrogen, cannot be liquefy at room temperature
2) Liquefied gases eg propane and butane, will liquefy under pressure
All compressed gases are classed as dangerous goods
1) Flammable
2) Non flammable
3) Poisonous /toxic
Hazards,
Explosion
Because the cylinder is under pressure, it may rupture, if damaged or
structurally unsound or if subjected to extremes of heat. This will result in not only the
release of the gas but also flying chards in many directions.
Any damage due to escaping gas will depend on the properties of the gases involved and
the location of the material eg in an open area or in an enclosed lab space
To prevent a fire, avoid: 1) Sources of ignition
2) Mixtures of a flammable gases and oxygen or air,
3) Separate from oxidizing agents and combustible materials
Poisoning/freezing
1) Long or short term effects depending on the gas involved and the method of entry into
the body
2) TLV is the limit of an eight hour exposure to the material
3) IDLH means immediate danger to life and health
4) Oxygen deficient atmospheres exist when a gas replaces the normal oxygen
concentration of air
5) Do not enter any confined space without contacting the safety office
6) Gas cools on expansion and therefore can cause freezing of tissues. Protect yourself
Do’s
1) Read all MSDS and manuals associated with the use of your gas and regulator
2) Confirm the gas content of the cylinder prior to use
3) Read the properties of the gas on the cylinder label
4) If a label is absent or damaged, do not use a gas cylinder
5) Ensure all filled cylinders are securely chained, above the mid point
6) Store away from heat sources or flame
7) Do not roll the gas cylinder as shown in the movie, use a hand truck
8) All empty cylinders must have a protective cap installed
9) Match the regulator to the cylinder and the gas to be used
10) Do not repair or alter any gas associated equipment