Cylinders

Question 1

What are the four main incidents involving cylinders?

Answer 1

1. Leaks from the cylinder
2. Flashback from a torch into a cylinder
3. Cylinders in the vicinity of a fire and subject to direct or indirect heat
4. Hot-work residue

Question 2

What three forms can cylinder gases come in?

Answer 2

1. Permanent gases (oxygen)
2. Liquefiable (LPG)
3. Dissolved (Acetylene)

Question 3

What colour cylinder is Acetylene?

Answer 3

Maroon

Question 4

What colour cylinder is Oxygen?

Answer 4

White

Question 5

What colour cylinder is Argon?

Answer 5

Dark green

Question 6

What colour cylinder is Nitrogen?

Answer 6

Black

Question 7

What colour cylinder is Carbon Dioxide?

Answer 7

Grey

Question 8

What colour cylinder is Helium?

Answer 8

Brown

Question 9

What colour cylinder signifies inert gas?

Answer 9

Bright green

Question 10

What colour cylinder signifies flammable gas?

Answer 10

Red

Question 11

What colour cylinder signifies toxic gases?

Answer 11

Yellow

Question 12

What colour cylinder signifies oxidising gases?

Answer 12

Pale blue

Question 13

What is the UN classification 2.1?

Answer 13

Flammable gases

(Red background with fire symbol)

Question 14

What is the UN classification 2.2?

Answer 14

Non flammable, non toxic gases

(Green background with cylinder icon)

Question 15

What UN classification is 2.3?

Answer 15

Toxic gases

(White background with skull and cross bones)

Question 16

What is UN classification 4.3?

Answer 16

Substances which emit flammable gases when in contact with water

(Blue background with fire symbol)

Question 17

What are the main characteristics of LPG?

Answer 17

1. Odourless, colourless and non-toxic
2. Gas at normal temperature
3. Higher density than air
4. Flammable range between 2-10%
5. Expansion ratio of approx 250 times its liquid volume

Question 18

What are the main hazards of flammable gas cylinders that fail in a fire?

Answer 18

1. Blast pressure wave
2. Fireballs up to 25m
3. Cylinders in the thrown up to 150m
4. Fragments thrown up to 200m
5. Flying glass and other materials
6. Structural damage to buildings in vicinity

Question 19

What is different about the structure of Acetylene cylinders?

Answer 19

It can undergo self-sustaining internal decomposition, producing heat even after the fire is extinguished

Question 20

What is the default hazard zone for cylinders involved in fire?

Answer 20

200m

Question 21

What is a BLEVE?

Answer 21

Boiling liquid expanding vapour explosion

Question 22

What is UVCE?

Answer 22

Unconfined vapour cloud explosion