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Mine Rescue Training > Bg4 Pneumatics > Flashcards

Bg4 Pneumatics Flashcards

1
Q

What is the location of the O2 pressure reducer in the BG4?

A

In the lower right hand corner

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2
Q

What is the primary function of the O2 pressure reducer?

A

Distributes high and medium pressure O2 to the breathing loop

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3
Q

What activates the electronics in the O2 pressure reducer?

A

High pressure from the O2 cylinder

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4
Q

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

A

4.0 bar to 4.4 bar

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5
Q

At what pressure is the relief valve activated to prevent over pressurization?

A

6.0 bar

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6
Q

What is the replacement rate of O2 consumed from the breathing loop?

A

1.5 to 1.9 L/min

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7
Q

What flow rate does the minimum (demand) valve supply medium pressure O2?

A

80 L/min

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8
Q

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

A

50 L/min

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9
Q

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

A

By a hand-tightened connector

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10
Q

What is the primary function of the pneumatic system?

A

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

This system ensures that oxygen is delivered efficiently to users in various applications.

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11
Q

List the main components of the pneumatic system.

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

Each component plays a critical role in managing oxygen supply and pressure.

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12
Q

True or False: The O2 Cylinder is a component of the pneumatic system.

A

True

The O2 Cylinder stores oxygen for distribution in the system.

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13
Q

Fill in the blank: The _______ is responsible for reducing the pressure of oxygen in the pneumatic system.

A

O2 Pressure Reducer

This component ensures the oxygen is delivered at a safe and usable pressure.

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14
Q

What does the Minimum (Demand) Valve do in the pneumatic system?

A

It regulates the flow of oxygen based on demand.

This valve ensures that oxygen is supplied only when needed, preventing wastage.

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15
Q

Fill in the blank: The _______ are pathways through which oxygen travels in the pneumatic system.

A

O2 Lines

These lines connect various components and facilitate the movement of oxygen.

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16
Q

What is the volume of the Oz cylinder?

A

Two litres

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17
Q

What materials are the Oz cylinder available in?

A

High-grade alloy-steel or carbon composite

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18
Q

What is the pressure of a fully charged O2 cylinder?

A

About 200 bar

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19
Q

How much oxygen does a fully charged O2 cylinder contain?

A

At least 400 litres of 99 per cent O2

20
Q

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

A

Four hours

21
Q

What type of valve is equipped on each cylinder?

A

Brass On/Off valve

22
Q

What happens to the safety cap on the On/Off valve?

A

It will burst when the internal pressure reaches about 275 bar

23
Q

Why should cylinder valves be opened slowly?

A

To prevent oxygen burn out

24
Q

How often must steel cylinders be hydrostatically tested?

A

Every five years

25
Q

What pressure must steel cylinders be tested to for compliance?

A

345 bar

26
Q

True or False: The Oz cylinder is secured to the frame of the BG4 using a pull strap.

A

True

27
Q

Fill in the blank: The Oz cylinder is attached to the frame of the BG4 with a _______.

A

Pull strap

28
Q

What is the volume of the Oz cylinder?

A

Two litres

29
Q

What materials are the Oz cylinder available in?

A

High-grade alloy-steel or carbon composite

30
Q

What is the pressure of a fully charged O2 cylinder?

A

About 200 bar

31
Q

How much oxygen does a fully charged O2 cylinder contain?

A

At least 400 litres of 99 per cent O2

32
Q

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

A

Four hours

33
Q

What type of valve is equipped on each cylinder?

A

Brass On/Off valve

34
Q

What happens to the safety cap on the On/Off valve?

A

It will burst when the internal pressure reaches about 275 bar

35
Q

Why should cylinder valves be opened slowly?

A

To prevent oxygen burn out

36
Q

How often must steel cylinders be hydrostatically tested?

A

Every five years

37
Q

What pressure must steel cylinders be tested to for compliance?

A

345 bar

38
Q

True or False: The Oz cylinder is secured to the frame of the BG4 using a pull strap.

A

True

39
Q

Fill in the blank: The Oz cylinder is attached to the frame of the BG4 with a _______.

A

Pull strap

40
Q

Where is the minimum valve located?

A

On the right side of the breathing bag

41
Q

What triggers the activation of the minimum valve?

A

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

42
Q

What happens during extreme physical effort regarding O2 supply?

A

More O2 may be needed than is supplied by the constant dosage system

43
Q

How is the minimum valve activated?

A

Deflation of the breathing bag activates the valve’s rocker arm

44
Q

What does the opening of the minimum valve do?

A

Injects additional O2 into the breathing loop

45
Q

What can induce a pressure drop in the breathing loop?

A

Excessive breathing demand or a leak in the system

46
Q

What type of O2 does the minimum valve use?

A

Medium pressure O2 from the O2 pressure reducer

47
Q

Approximately how much O2 does the minimum valve provide to the breathing loop?

A

80 L/min

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