Marine First Aid Level 4 (VTQ)
Course Content
- Course Introduction
- Human anatomy and physiology for immediate emergency care
- Safety and Calling for Help
- What3Words - location app
- Marine band radios
- Marine VHF Radios
- Common Coastal Water Dangers
- Common Fresh Water Marine Dangers
- Emergency Flares
- LED Flares
- The Coastguard
- The Air Ambulance
- Personal Location Beacons
- Accident Prevention
- Boat Safety
- Calling for help
- Water safety tubes
- Types of Blankets
- Emergency response for hybrid and electric boats
- First Aid and Safety Equipment\
- Initial Assessment and Care
- Basic airway management in emergency care
- CPR
- AED
- Administration of oxygen therapy
- Drowning
- Choking
- Shock
- Bleeding
- Catastrophic Injury
- Injuries
- Hypothermia
- Illness
- FIrst Responder - Management of injuries
- Prioritising first aid
- Pelvic Injuries
- Spinal Injuries
- Rapid Extrication
- SAM Pelvic Sling
- Box Splints
- Spinal Injury
- Stabilising the spine
- Spinal Recovery Position
- Introduction to Spinal Boards
- The spinal board
- Using the Spinal Board
- The Scoop Stretcher
- Using the scoop stretcher
- Cervical collars
- Vertical C-Spine Immobilisation
- Joint examination
- Adult fractures
- Types of fracture
- First Responder - Management of trauma
- Elevated Slings
- Lower limb immobilisation
- Elevation Techniques
- Helmet Removal
- Different Types of Helmets
- The Carry Chair
- Applying Plasters
- Strains and Sprains and the RICE procedure
- Eye Injuries
- Electrical Injuries
- Foreign objects in the eye, ears or nose
- Nose bleeds
- Bites and stings
- Chest Injuries
- Foxseal chest seals
- Abdominal Injuries
- Treating Snake Bites
- Types of head injury and consciousness
- Dislocated Shoulders and Joints
- Other Types of Injury
- Dental Injuries
- First Responder - Management of medical conditions
- Asthma
- Asthma Spacers
- When an Asthma inhaler is not available
- Accuhaler®
- Heart Attack
- Warning signs of cardiac arrest and heart attack
- Heart Attack Position
- Aspirin and the Aspod
- Stable angina
- Hypertension
- Pulse Oximetry
- Epilepsy
- Epilepsy treatment
- Meningitis
- Diabetes
- Blood Sugar Testing
- Poisons and Food Poisoning
- Shock
- Near and secondary drowning
- Cold water shock
- Allergic Reactions and Anaphylaxis
- Course Summary
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Get StartedHow long does an Oxygen cylinder last?
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There are many different sizes of oxygen cylinders available and you need to plan how long they will last so you can ensure that you have the correct amount of oxygen for your needs. There is a simple formula to calculate how long a cylinder will last, but to start with, you will need to know a few figures. The first unit you will need to know is the cylinder pressure. This should be on the cylinder or you can ask your supplier. In the example we are using, the pressure will be 2000 psi. We will need to take off of this a figure of residual pressure of 200 psi. This will allow 200 psi for errors in a calculation or initial cylinder fill errors and also give a short extra supply. The next figure you will need is a cylinder constant. This is a figure you will need in order to calculate how long a cylinder will last. These figures are a D cylinder, the constant figure is 0.16. An E size is 0.28, an M size is 1.56, a G size is 2.41, and an H and a K size is 3.14. Do not worry about remembering the constant figure. You can refer to the fact sheet we have put in the download area of this course. Use the figure that's relative to the size cylinder you have. In the example we'll give, we are calculating the time a D size cylinder will last, so we'll use the constant figure of 0.16. The final figure we need to know is the flow rate in litres per minute. The usual maximum flow rate for regulators is 15 litres a minute. This may be higher in specialist applications like where in scuba diving, where their flow rate could be 25 litres per minute. In the example we'll use, we'll use the usual maximum of 15 litres a minute. You may want to calculate how long a cylinder will last for a nasal cannula, and you could change the flow rate to six litres a minute. Now, let's calculate how long a D cylinder will last at 15 litres per minute. The formula is tank pressure minus residual pressure multiplied by the cylinder constant divided by the flow rate. This'll give you the time in minutes the cylinder will last. To use our example, 2000 psi minus 200 psi equals 1800 psi. Multiply 1800 by the constant of 0.16 and this equals 288. Finally, divide this figure of 288 by 15 litres a minute to equal 19.2 minutes. We should normally round it down. A D size cylinder will last 19 minutes at 15 litres per minute.
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.