Extinguishers

Question 1

What can a CO2 extingusiher USED for? (3)

Answer 1

Class A, B & E fires

solids, liquids & electrical

Question 2

What is a Dry Chem extingusiher USED for? (4)

Answer 2

Class A, B C, E fires

solids, liquids, gases & electrical

Question 3

What is a Foam extingusiher USED for? (3)

Answer 3

Class A, B & F (limited) fires

solids, liquids & fats

Question 4

What is a Water extingusiher USED for? (1)

Answer 4

Class A fires (only)

solids

Question 5

What is unique to CO2 extingusiher CONSTRUCTION? (4)

material, contents, components

Answer 5

• Drawn steel cylinder
• CO2 gas in liquid form
• Non-conductive director horn
• Safety valve operates at 17.2 MPa

Question 6

What is unique about the Foam extinguishers CONSTRUCTION? (4)

Answer 6

• Stainless steel cylinder
• Mixture = 8.4L water & 600ml of foam concentrate
• Pressure gauge → pressurised with air to 700kPa
• Aspirating branch and nozzle

Question 7

What is unique to Dry Chem extingusiher CONSTRUCTION? (4)

Answer 7

• Welded steel cylinder
• 9kg of dry chem powder
• Pressurised with inert gas (nitrogen) → pressure gauge connected to internal pickup tube
• Polypropylene or metal applicator

Question 8

What is unique to Water extingusiher CONSTRUCTION? (4)

Answer 8

• Stainless steel cylinder
• 9L of water
• Pressure gauge → pressurised with air to 700kPa
• 4mm nozzle

Question 9

What are (3) common CONSTRUCTION components of ALL 4 extinguishers? (3)

Answer 9

1. Valve assembly with squeeze handle
2. Locking pin & tamper proof seal
3. Delivery hose

Question 10

What are the common OPERATION practices of ALL 4 extinguishers? (2)

Answer 10

1. Operate in an upright position
2. Pull Pin, Aim, Squeeze & Sweep (PASS)

Question 11

What is the STREAM & DURATION of ALL 4 extinguishers? (4)

Answer 11

• CO2 = 1-2m & 15sec
• Dry Chem = 3-4m & 10-20sec
• Foam = 5m & 45secs
• Water = 6m & 1min

Question 12

What is the MAINTAINENCE of ALL 4 extinguishers? (3)

Answer 12

1. Visual inspection
2. Inspect seal/locking pin & hose
3. Check pressure gaugue (⚪🔵🔴), director horn (⚫) & aspirating branch (🔵) → if present

Question 13

What is the SAFETY of ALL 4 extinguishers? (3)

Answer 13

• Wear PPE
• Be aware that re-ignition may occur
• Have 2nd extinguisher ready (as backup or alternate extinguisher type)

⚪Dry Chem → Use in confined spaces is potentially dangerous & extinguisher may flashback
🔵Foam → Can make floor slippery

Question 14

What is the LOCATION of ALL 4 extinguishers?

Answer 14

• MKV = OS Centre
• Heavy = OS1