## FAQ Level 3 Award for First Responders on Scene: Emergency First Responder (RQF) FROS® - Online Blended Part 1

219 videos, 11 hours and 53 minutes

## Course Content

• Course Introduction
• Human anatomy and physiology for immediate emergency care
• Assessment of casualties in immediate emergency care
• Basic airway management in emergency care
• Basic life support and external defibrillation
• Management of medical conditions
• Support the emergency care of wounds, bleeding and burns
• Management of injuries
• Management of trauma
• Recognition and management of anaphylaxis
• Course Summary and your Practical Part

# How long does an Oxygen cylinder last?

Video 212 of 219
2 min 47 sec
English
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# Calculating Oxygen Cylinder Duration

## Planning Oxygen Usage

Determining How Long Your Oxygen Cylinder Will Last

### Using the Cylinder Duration Formula

Estimating Oxygen Supply Time

• Step 1: Cylinder Pressure
• Locate the cylinder pressure (psi).
• Subtract a residual pressure of 200 psi to account for errors.
• Step 2: Cylinder Constant
• Refer to the cylinder constant values:
• "D" cylinder: Constant = 0.16
• "E" size: Constant = 0.28
• "M" size: Constant = 1.56
• "G" size: Constant = 2.41
• "H" and "K" size: Constant = 3.14
• Choose the constant based on your cylinder size.
• Step 3: Flow Rate
• Determine the flow rate in litres per minute.
• Typically, regulators provide a maximum of 15 litres per minute.
• Specialist applications may have higher flow rates (e.g., scuba diving, 25 litres per minute).
• Adjust the flow rate as needed (e.g., 6 litres per minute for a nasal cannula).
• Step 4: Calculate Duration
• Use the formula: (Tank pressure - Residual pressure) x Cylinder constant / Flow rate
• Calculate the time in minutes that the cylinder will last.

### Example Calculation

Estimating Duration for a "D" Cylinder at 15 Litres Per Minute

• Step 1: (2000 psi - 200 psi) = 1800 psi
• Step 2: Cylinder Constant for "D" size = 0.16
• Step 3: Flow rate = 15 litres per minute
• Step 4: (1800 psi x 0.16) / 15 litres per minute = 19.2 minutes
• Estimated Duration: Approximately 19 minutes (rounded down)

Use this formula to calculate the duration of your oxygen cylinder based on your specific parameters.