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Mine Rescue Training > BG4 > Flashcards

BG4 Flashcards

1
Q

What is the purpose of the pneumatic system in the context of oxygen distribution?

A

The pneumatic system is responsible for the oxygen distribution to the breathing loop.

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2
Q

List the components of the pneumatic system.

A
  • O2 Cylinder
  • O2 Pressure Reducer
  • Minimum (Demand) Valve
  • O2 Lines
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3
Q

What is the volume of the O2 cylinder used in the BG4?

A

Two litres.

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4
Q

What materials can the O2 cylinder be constructed from?

A
  • High-grade alloy-steel
  • Carbon composite
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5
Q

What is the pressure of a fully charged O2 cylinder?

A

About 200 bar.

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6
Q

How much oxygen does a fully charged O2 cylinder contain?

A

At least 400 litres of 99 per cent O2.

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7
Q

Under normal breathing conditions, how long is the O2 cylinder rated to last?

A

Four hours.

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8
Q

What is the function of the brass On/Off valve on the O2 cylinder?

A

To control the flow of oxygen from the cylinder.

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9
Q

What safety feature is included in the On/Off valve to prevent over-pressurization?

A

A safety cap that will burst at about 275 bar.

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10
Q

True or False: Cylinder valves should be opened quickly to prevent oxygen burn out.

A

False

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11
Q

How often must steel cylinders be hydrostatically tested?

A

Every five years.

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12
Q

To what pressure must steel cylinders be tested to comply with regulations?

A

345 bar.

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13
Q

What is the volume of the O2 cylinder?

A

Two litres

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14
Q

What materials are the O2 cylinders available in?

A

High-grade alloy-steel or carbon composite

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15
Q

What is the pressure of a fully charged O2 cylinder?

A

About 200 bar

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16
Q

How much oxygen does the cylinder contain?

A

At least 400 litres of 99 per cent O2

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17
Q

How long is the O2 cylinder rated to last under normal breathing conditions?

A

Four hours

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18
Q

What type of valve is equipped on each cylinder?

A

Brass On/Off valve

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19
Q

What safety feature prevents over-pressurization in the O2 cylinder?

A

A safety cap that will burst at about 275 bar

20
Q

Why should cylinder valves be opened slowly?

A

To prevent oxygen burn out

21
Q

How often must steel cylinders be hydrostatically tested?

A

Every five years

22
Q

What pressure must steel cylinders be tested to during hydrostatic testing?

A

345 bar

23
Q

True or False: The O2 cylinder is secured to the BG4 frame using a pull strap and buckle.

A

True

24
Q

Fill in the blank: A fully charged O2 cylinder contains at least _______ litres of 99 per cent O2.

A

400

25
Q

What is the primary function of the O2 pressure reducer in the BG4?

A

Distributes high and medium pressure O2 to the breathing loop

The O2 pressure reducer is crucial for managing oxygen delivery during operation.

26
Q

What activates the electronics of the O2 pressure reducer?

A

High pressure from the O2 cylinder

This activation is essential for the functioning of the pressure reducer.

27
Q

What is the output pressure range of the O2 pressure reducer?

A

4.0 bar to 4.4 bar

This medium pressure output is vital for supplying O2 to the breathing loop.

28
Q

At what pressure does the relief valve activate to prevent over pressurization?

A

6.0 bar

The relief valve is a safety feature to avoid excessive pressure in the system.

29
Q

What is the rate at which O2 is replaced in the breathing loop during normal operation?

A

1.5 to 1.9 L/min

This constant dosage is necessary to maintain adequate oxygen levels.

30
Q

What flow rate of medium pressure O2 is supplied when the minimum (demand) valve is activated?

A

80 L/min

This high flow rate ensures that the user receives sufficient oxygen on demand.

31
Q

What is the flow rate of O2 injected into the breathing loop by the manually operated by-pass valve?

A

50 L/min

This manually controlled feature allows for additional oxygen supply when needed.

32
Q

How is the O2 pressure reducer connected to the O2 cylinder?

A

By a hand-tightened connector

This design facilitates easy assembly and disassembly for maintenance.

33
Q

What is the function of the minimum (demand) valve?

A

To inject additional O2 into the breathing loop during extreme physical effort.

34
Q

Where is the minimum valve located?

A

On the right side of the breathing bag.

35
Q

At what pressure range does the minimum valve activate?

A

When the breathing loop pressure drops to between 0.1 and 2.5 mbar.

36
Q

What triggers the activation of the minimum valve?

A

Deflation of the breathing bag, which activates the valve’s rocker arm.

37
Q

What causes a pressure drop in the breathing loop?

A

Excessive breathing demand or a leak in the system.

38
Q

What type of O2 does the minimum valve use?

A

Medium pressure O2 from the O2 pressure reducer.

39
Q

How much O2 does the minimum valve provide to the breathing loop?

A

Approximately 80 L/min.

40
Q

What is the purpose of the COz scrubber canister in the BG4 breathing loop?

A

Removes carbon dioxide from exhaled air

This is essential for maintaining breathable air during prolonged use.

41
Q

How is inhaled air treated in the BG4 system?

A

Cooled by the air cooler and replenished with O2

This process ensures that the air is suitable for breathing.

42
Q

What are the main components of the BG4 breathing loop?

A
  • Facemask
  • Connector assembly
  • Exhalation/inhalation hoses
  • COz scrubber canister
  • Breathing bag
  • Pressure relief valve
  • Moisture relief valve
  • Air cooler

Each component plays a crucial role in the effectiveness of the breathing system.

43
Q

True or False: The BG4 breathing loop operates in an open system.

A

False

The BG4 operates in a closed breathing loop.

44
Q

Fill in the blank: The _______ is used to manage excess pressure in the BG4 breathing loop.

A

Pressure relief valve

This valve prevents overpressure situations that can occur during breathing.

45
Q

What is the function of the moisture relief valve in the BG4 system?

A

Removes excess moisture from the breathing loop

This is important to prevent condensation that could affect the system.

46
Q

What role does the breathing bag serve in the BG4 breathing loop?

A

Acts as a reservoir for inhaled air

This allows for a consistent supply of air to the user.

Mine Rescue Training (16 decks)

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