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FRV RC7 Mid Course Exam 2 > Breathing Apparatus > Flashcards

Breathing Apparatus Flashcards

1
Q

State the composition of the following:

  • Inhaled Air
  • Exhaled Air
A

Inhaled Air:

  • 79% Nitrogen
  • 21% Oxygen
  • ‘Trace’ (0.03%) Carbon Dioxide

Exhaled Air:

  • 79% Nitrogen
  • 17% Oxygen
  • 4% Carbon Dioxide
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2
Q

State the four (4) respiratory hazards that a firefighter may encounter at a fire:

A

High air temperature
Oxygen deficiency
Toxic chemicals
Smoke concentration

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3
Q

State the two (2) types of self-contained breathing apparatus:

A
  • Closed circuit BA

- Open circuit BA

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4
Q

State the differences in the air flow and working time between the Open Circuit and Closed Circuit breathing apparatus:

A

Open Circuit:
Air that is exhaled by the BA wearer is expelled into the atmosphere.
At a consumption rate of 60lpm, a cylinder containing 2040 litres of air will have a notional full duration of 34 minutes and a working time of 24 minutes.

Closed Circuit:
Cylinder holds compressed oxygen, carbon dioxide is absorbed by the equipment and unused oxygen is re-circulated.
Working time is much longer than an open circuit BA at up to 4 hours.
*Requires specialist training

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5
Q

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.

A

2040 L / 60Lpm - 10 minutes (i.e 100 bar)
= 34 - 10 minutes
= 24 minutes working time

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6
Q

List the eleven (11) main components of the MSA G1 E Breathing Apparatus:

A
  1. Carrier frame and harness
  2. Control module
  3. Face mask with HUD
  4. Pressure reducer with low pressure warning whistle
  5. Power module
  6. Demand valve
  7. Voice projection speaker
  8. Buddy breather
  9. Battery
  10. Cylinder
  11. Tally tag
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7
Q

List eight (8) guideline procedures that are to be adhered to:

A
  1. The team should consist of a minimum of two (2)
  2. The team leader carries the guideline
  3. The last firefighter of the team ties the line off at a convenient height above ground (keep off ground). The line is to be fastened on the side of search. Crossing with other lines is to be avoided
  4. When a guideline is being laid, team members, other than the leader, should attach themselves to the line by the hook of their personal line, using the 1.2m length.
  5. When attached individually to the guideline by means of a short personal line, team members should maintain contact by physical touch
  6. If a team has to retire before the objective is reached, the container and the line should be removed and fastened at a convenient point for the next relief crew
  7. To move away from the guideline, personal lines are to be used to their full length, i.e. 6m. When the distance is greater, a branch line must be used.
  8. Firefighters operating branches do not need to remain attached to guidelines by personal lines
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8
Q

State the duties of the BA operator (12):

A
  • Don BA in fresh air
  • Work in teams of at least two (2)
  • Select the designated fireground channel on radios
  • Deposit BA tally tags at a BA entry point
  • Enter correct and relevant details on BA tally tag
  • Report to the BA entry and collect their BA tally tags on exiting the fire/incident.
  • Check time out/low air periodically
  • Exit the fireground accompanied by at least one (1) other member of the team when the cylinder gauge of their BA reaches a pre-determined level, or the cylinder low-air warning signal operates
  • Proceed towards the sound of a full alarm or distress signal, assistance takes precedence over the work in hand. Communication of the situation to BA Entry officer/IC is required.
  • All crews will withdraw immediately upon the operation of the evacuation alarm.
  • Use guidelines on the instruction of the IC
  • Report to BA service after collecting BA tally tags from the BA entry (if in operation)
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9
Q

State five (5) responsibilities of your agencies BA Control Officer (DIV A):

A
  1. To supervise BA service, entry points and all BA requirements
  2. Set up the Emergency Signal Unit (ESU)
  3. To liaise with BA entry, BA service
  4. As directed by the IC, have an adequate number of firefighters available and dressed in BA as reliefs, and to order them to the appropriate BA entry in time to enable those points to carry out their responsibilities
  5. Notify the IC of unaccounted firefighters for activation of relief crews.
  • To liaise with the IC and Operations Officer on BA strategies and tactics and send periodic reports to the IMT.
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10
Q

List the shift procedures for BA operators:

A
  • Carry out general checks of BA as per the procedures
  • Record relevant information on the BA tally tag
  • Check that BA control board is in order and available for use
  • Check time on BA control board matches the time on Station Turn Out (STO) system in the watchroom and adjust if necessary
  • Check that personal lines and guidelines are available
  • Report result of check to Officer-in-Charge
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11
Q

In relation to the emergency signal unit, specify the blast sequence for the following signals:

  • Evacuation
  • Cease operations/quite
  • Resume operations
A

Evacuation:
3 short blasts of 1 second each

Cease operations/quiet:
1 blast of 3 seconds

Resume operations:
1 blast of 3 seconds followed by 1 blast of 1 second

A 3 second interval will occur and the signal is then repeated until the site is evacuated, or as deemed necessary

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12
Q

If a faulty BA is identified during your Change-of-Shift tests, list the actions necessary for your Fire Service (DIV A):

A
  1. Notify your OIC
  2. Remove the BA from the vehicle
  3. Complete a ‘BA Fault Tag’ and attach it to the BA
  4. Arrange for a replacement BA set from your Zone Station or FS38 for Central Zone stations
  5. Send the BA away as a complete unit
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13
Q

List five (5) safety features incorporated into the MSA G1 E Breathing Apparatus:

A
  1. Hand wheel with a ratchet mechanism that stops the cylinder from being closed accidently.
  2. Low pressure warning whistle (below 55 bar)
  3. Four (4) buddy lights
  4. Pressure reducer
  5. Piezo Alarm Speakers
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14
Q

Explain the two (2) stages of BA control:

A

Stage 1:
Implemented in any situation where it is necessary to use a BA. BA entry procedures should be implemented, however the BA entry point initially may or may not be supervised i.e. if you are the first truck on scene.

Stage 2:
At larger jobs and where BA is required to be to be worn over a longer period, under severe conditions or involve a number of BA operators, Stage 2 will be implemented if determined by the IC. It is only instigated if BA38 is in attendance. A larger control board is required to account for BA operators and more detail.

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15
Q

Explain why a Pressure Sealing Test is conducted on a BA:

A

The pressure value must read a minimum of 250 bar to be classified as in service and placed on the truck. The pressure check is conducted to ensure that there are no leaks in the pressure valve, there should not be a reduction of more than 10 bar after monitoring for 1 minute during the check.

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16
Q

What does the acronym H.O.T.S stand for?

A

H - High Temperature
O - Oxygen Deficiency
T - Toxic Chemicals
S - Smoke Inhalation/Concentration

17
Q

For a BA set, what is meant by:

  • Full duration
  • Working duration
  • Safety margin
A

Full Duration:
The estimated time that a full cylinder will have air. For a 2040 litre cylinder, at 60lpm consumption it would be 34 minutes.

Working Duration:
An exit/decontamination time is subtracted from the full duration to provide an actual working time for the operator, leaving some wiggle room.

Safety Margin:
A safety margin of approximately 10 minutes is allowed for exit/decontamination.

18
Q

Explain how to perform the Audible Warning Signal Test (Low Air alarm) on the MSA G1 E:

A
  1. Open the cylinder valve fully to fully pressurise the BA
  2. Close the cylinder valve fully.
  3. Activate purge button of the demand valve so air pressure is released.
  4. When the pressure displayed on the control module and analogue gauge drops below 100 bar, ensure the following occurs.
    a) A flashing yellow LED must display in the HUD
    b) The electronic low pressure warning alarm must sound from 99-0 bar every 10 seconds
    c) All the buddy lights must be flashing yellow
    d) The control module LCD screen backlight must turn yellow.
  5. When the pressure displayed on the control module and analogue gauge drops below 55 bar +- 5 bar:
    a) A flashing red LED must display in the HUD
    b) The mechanical low pressure warning whistle should be sounding
    c) All the buddy lights should be flashing red
    d) The control module LCD screen backlight must turn red.
    The alarms should continue until the air pressure is 0
  6. When the system falls below 15 bar, put the control module into sleep mode by pressing the reset button (green) twice within one second.
  7. Keep the purge button pressed to release any remaining pressure in the system.
  8. Release the purge button
  9. Park the demand valve by pressing the red detachment button.
    If the mechanical low pressure warning whistle, control module, or HUD does not function properly, the BA must be removed from service.
19
Q

What four (4) standards does the MGA G1 E meet?

A
  • BS EN 137:2006 Respiratory protective devices. Self contained open-circuit compressed air breathing apparatus with full face mask. Requirements, testing, marking
  • BS EN 136:1998 Respiratory protective devices- full face masks - requirements, testing, marking
  • AS/NZS 1715:2009 Selection, use and maintenance of respiratory protective equipment
  • AS/NZS 1716:2012 Respiratory protective devices
20
Q

Name the disinfectant, the amount (ratio to water) and submersion time required to disinfect facemasks:

A

Biogard Concentrate
Mixing ratio - 1:80 (1 part Biogard to 80 parts water)
Eg. 250mL of Biogard - 20L water
Completely submerge facemask for 10 minutes, do not submerge for any longer than 10 minutes.

21
Q

State your actions at an incident should your BA lose all power or electronic functionality:

A
  1. Attempt to use the purge button in the event of an airflow restriction
  2. Communicate with a team member and exit immediately to BA entry
    Emergency radio communication may be required, depending on the situation
22
Q

State the min pressure for first use of a BA set:

A

The BA should not be placed on the truck or into service if the pressure in the cylinder is less than 250 bar.
BA Operator must not enter a fireground if the pressure in the cylinder is less than 200 bar

23
Q

State the flow capacity of the pressure reducer:

A

The pressure reducer has a flow capacity of 700 litre per minute at full pressure.

24
Q

What is the preferred minimum pressure the provider must have to enact the buddy breathing procedure?

A

There is preferred minimum pressure of 150 bar.

25
Q

When should you change the battery?

A

When the low battery warning activates.
There are two (2) hours of continuous power remaining, however at this point the operator should prepare to leave the fireground and change the battery before heading back in.

26
Q

State the 4 HUD air cylinder pressure indicator levels and the corresponding pressure ranges in the bar:

A

Four (4) circular pressure status indicators
4 green = 300 - 271 bar
3 green = 270 - 181 bar
2 green = 180 - 100 bar
1 yellow = 99 - 60 bar (Oscillating)
1 red = 59 - 0 bar (Flashing continuously until shutdown)

27
Q

State what the solid red triangle indicates in the HUD:

A

Motion Full Alarm or

Manual Alarm has been activated

28
Q

Explain the PACT check:

A

P - PPC / PPE / Equipment

  • Personal Protective Clothing - all structural clothing is correctly worn
  • Personal Protective Equipment - all PPE is carried and functioning ie. BA on, torch, portable radio
  • Equipment - all necessary equipment is carried and function ie. branch charged and set to correct flow and pattern, TIC on, forcible entry tools

A - Air

  • Is your partner’s BA pressurised? (check their buddy lights - Green is Go)
  • Check the number of HUD lights on a visible in your mask (4 lights, 3 lights, 2 lights)
  • Positive Pressure Test (pull your face mask away slightly from your face by the demand valve to ensure you have air flow, Ensure your demand valve is securely attached to your face)

C - Communications

  • Voice Projection Speaker on an working
  • Portable Radio
  • Who are you? (what is your team designation ie. BA team Alpha)

T - Tally tag, Task

  • Has your BA tally tag been correctly filled out and placed in the BA control board
  • Task - What is your objective ie. locate fire and extinguish
  • Tactics - how are you going to achieve your task
29
Q

What are the four (4) actions you should consider when entrapped?

A
  • Manually activate the alarm on the control module, then make way as close to the nearest point of entry as possible. Remain calm and still where possible to increase the duration of the BA set.
  • The team should sit down, remain together and not remove their BA sets
  • Use a hose line, if available, to safeguard the team.
  • Notify BA entry and the IC of the situation using portable radio.
30
Q

Name the main components of the BA Face Mask:

A

Outside:

  • Head harness
  • Quick release tabs
  • Neck strap
  • Full view polycarbonate visor
  • Nose cup
  • Inhalation valve

Inside:

  • Nose cup
  • Reverse flange facial seal
  • Speech diaphragm
31
Q

List the four (4) levels of the Motion Alarm:

A 
Level 1 - Control module inactive for 17.5 secs (Move control module to de-activate)
Level 2 - Control module inactive for 20 secs (Move control module to de-activate)
Level 3 - Control module inactive for 25 secs (Move control module to de-activate)
Level 4 - Full Alarm - Control module inactive for 30 secs (Press reset twice to de-activate)

FRV RC7 Mid Course Exam 2 (17 decks)

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