BA

Question 1

What is the breakdown of inhailed air?

Answer 1

Nitrogen = 79%
Oxygen = 21%
CO2 = Trace

Nitrogen % incliudes other rare gases

Question 2

What is the breakdown of exhailed air?

Answer 2

Nitrogen = 79%
Oxygen = 17%
CO2 = 4%

Nitrogen % incliudes other rare gases

Question 3

How is working duration calcualted?

Answer 3

Air Contents of cylinders (L)/Consumption Rate (60 L/m) - Exit/Decon time (mins)

ie. (2040L/60Lpm) - 10mins = 24mins

Question 4

Define working duration?

Answer 4

• Its a notional figure that estimates the working duration of an air cylinder
• Uses a fixed breathing rate to account for a broad range of consumption rates

Question 5

Explain the difference between open-circuit BA and closed-circuit BA?

Answer 5

Open-circuit BA
- Air that is exhaled by the BA wearer is expelled to the atmosphere.
- Working time of 24 mins

Closed-circuit BA
- The cylinder holds compressed oxygen, carbon dioxide is absorbed by the equipment and unused oxygen is re-circulated.
- Working time of up to 4 hrs

Question 6

Define Emergency Evacuation Signal? How is it signaled?

Answer 6

• EES is used to signal rapid evacuation, cessation, or resumption of operations at a fire/incident site.
• Three short 1 second blasts, repeated every 10 seconds.

Question 7

What is the flash hood removal procedure?

Answer 7

1. Keep BA on
2. Place 2 hands under the inside of the hood at the back of the head
3. Move hands slowly upwards to start removing hood, then move hands forward over the face to finish removing the hood and leaving it hanging on the air line
4. Ensure the outside of the hood stays away from any skin to avoid any contact with contaminated side

Question 8

Why do we do a PACT check?

Answer 8

To assist FFs to practice, support and promote safe FF behaviour immediately prior to entering a hazardous environment when wearing BA.

Question 9

What is a PACT check?

Answer 9

PPC/PPE/Equipment

Air
* > 250 bar
* Positive pressure test

Communications
* Speaker
* Radio

Tally Tag/Task/Tactics