Breathing Apparady

HOTS and humans

100

Using the phonetic alphabet, state the acronym we use for the four respiratory hazards we may be faced with.

Hotel, Oscar, Tango, Sierra

200

The composition of inhaled air is:

___ nitrogen,
___ oxygen, and
___ carbon dioxide.

79%, 21%, and trace

300

The composition of exhaled air is:

79% nitrogen, 

17% oxygen, and 

4% carbon dioxide.

400

State the four respiratory hazards that a firefighter may encounter at a fire, and give an example of each.

H - High Air Temperature 

O - Oxygen Deficiency 

T - Toxic Atmosphere 

S - Smoke Concentration

500

State the seven parts of our respitory system mentioned in the PowerPoint.

(100 points given for each part)

Bronchi
Trachea
Ribs
Lungs
Diaphragm
Capillaries
Alveoli

Pressure

100

What is the minimum pressure for first use of a breathing apparatus set?

250bar

200

At what pressure will the Electronic low pressure warning alarm sound?

99 bar

300

At what pressure will the Exhaled air Mechanical low pressure warning whistle sound?

55 bar ±5 bar

500

On the whiteboard, calculate the working duration (in minutes) of a fully charged BA set with a 2040 litre cylinder, and a consumption rate of 60 L/min. Show all steps in your calculation.

For a fully charged 2040 litre cylinder: 

Actual Working Duration = (2040 L)/(60 L/m)
– 10 minutes (i.e. 100 bar) = 34
- 10 minutes = 24 minutes working time

Components

100

List four of the eight main components of the MSA G1.

◼ Carrier Frame and Harness
◼ Control Module
◼ Face Mask with HUD
◼ Pressure Reducer/low pressure warning whistle
◼ Power Module
◼ Demand Valve
◼ Voice Projection Speaker
◼ Buddy Breather
◼ Battery
◼ Cylinder
◼ Tally tag