Bg4 Pneumatics Flashcards
What is the location of the O2 pressure reducer in the BG4?
In the lower right hand corner
What is the primary function of the O2 pressure reducer?
Distributes high and medium pressure O2 to the breathing loop
What activates the electronics in the O2 pressure reducer?
High pressure from the O2 cylinder
What is the output pressure range of the O2 pressure reducer?
4.0 bar to 4.4 bar
At what pressure is the relief valve activated to prevent over pressurization?
6.0 bar
What is the replacement rate of O2 consumed from the breathing loop?
1.5 to 1.9 L/min
What flow rate does the minimum (demand) valve supply medium pressure O2?
80 L/min
What is the flow rate of O2 injected into the breathing loop by the manually operated by-pass valve?
50 L/min
How is the O2 pressure reducer connected to the O2 cylinder?
By a hand-tightened connector
What is the primary function of the pneumatic system?
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.
List the main components of the pneumatic system.
- O2 Cylinder
- O2 Pressure Reducer
- Minimum (Demand) Valve
- O2 Lines
Each component plays a critical role in managing oxygen supply and pressure.
True or False: The O2 Cylinder is a component of the pneumatic system.
True
The O2 Cylinder stores oxygen for distribution in the system.
Fill in the blank: The _______ is responsible for reducing the pressure of oxygen in the pneumatic system.
O2 Pressure Reducer
This component ensures the oxygen is delivered at a safe and usable pressure.
What does the Minimum (Demand) Valve do in the pneumatic system?
It regulates the flow of oxygen based on demand.
This valve ensures that oxygen is supplied only when needed, preventing wastage.
Fill in the blank: The _______ are pathways through which oxygen travels in the pneumatic system.
O2 Lines
These lines connect various components and facilitate the movement of oxygen.
What is the volume of the Oz cylinder?
Two litres
What materials are the Oz cylinder available in?
High-grade alloy-steel or carbon composite
What is the pressure of a fully charged O2 cylinder?
About 200 bar
How much oxygen does a fully charged O2 cylinder contain?
At least 400 litres of 99 per cent O2
Under normal breathing conditions, how long is the oxygen rated to last?
Four hours
What type of valve is equipped on each cylinder?
Brass On/Off valve
What happens to the safety cap on the On/Off valve?
It will burst when the internal pressure reaches about 275 bar
Why should cylinder valves be opened slowly?
To prevent oxygen burn out
How often must steel cylinders be hydrostatically tested?
Every five years
What pressure must steel cylinders be tested to for compliance?
345 bar
True or False: The Oz cylinder is secured to the frame of the BG4 using a pull strap.
True
Fill in the blank: The Oz cylinder is attached to the frame of the BG4 with a _______.
Pull strap
What is the volume of the Oz cylinder?
Two litres
What materials are the Oz cylinder available in?
High-grade alloy-steel or carbon composite
What is the pressure of a fully charged O2 cylinder?
About 200 bar
How much oxygen does a fully charged O2 cylinder contain?
At least 400 litres of 99 per cent O2
Under normal breathing conditions, how long is the oxygen rated to last?
Four hours
What type of valve is equipped on each cylinder?
Brass On/Off valve
What happens to the safety cap on the On/Off valve?
It will burst when the internal pressure reaches about 275 bar
Why should cylinder valves be opened slowly?
To prevent oxygen burn out
How often must steel cylinders be hydrostatically tested?
Every five years
What pressure must steel cylinders be tested to for compliance?
345 bar
True or False: The Oz cylinder is secured to the frame of the BG4 using a pull strap.
True
Fill in the blank: The Oz cylinder is attached to the frame of the BG4 with a _______.
Pull strap
Where is the minimum valve located?
On the right side of the breathing bag
What triggers the activation of the minimum valve?
When the breathing loop pressure drops to between 0.1 and 2.5 mbar
What happens during extreme physical effort regarding O2 supply?
More O2 may be needed than is supplied by the constant dosage system
How is the minimum valve activated?
Deflation of the breathing bag activates the valve’s rocker arm
What does the opening of the minimum valve do?
Injects additional O2 into the breathing loop
What can induce a pressure drop in the breathing loop?
Excessive breathing demand or a leak in the system
What type of O2 does the minimum valve use?
Medium pressure O2 from the O2 pressure reducer
Approximately how much O2 does the minimum valve provide to the breathing loop?
80 L/min
