OXYGEN
Do You Have Enough
HOW TO CALCULATE CYLINDER DURATION
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Calculating Cylinder Duration for Oxygen Tanks: Formulas and Instructions, Lecture notes of Chemistry
Instructions on how to calculate the duration of oxygen cylinder flow using the conversion factor, current cylinder pressure, and liter flow. It includes examples for different cylinder types and provides information on bias flow and FiO2. The document also explains how to use the Revel manual for vent configuration.
Typology: Lecture notes
2021/2022
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OXYGEN
Do You Have Enough
HOW TO CALCULATE CYLINDER DURATION
Cylinder Types and Figures
Conversion Factor is calculated by dividing the max volume by the
Max pressure.
Cylinder Type
Max Pressure
Max Volume
Conversion Factor D – Cylinder 2216 psi 350 L (gas) 0. E – Cylinder 2216 psi 625 L (gas) 0. Bell 407 2216 psi 2545 L (gas) 1. BK 117 1-10 L (liquid) 1 L of liquid = 860 L of Gas
The Revel
It will calculate the cylinder duration for you
Revel Manual. Chapter 10, pg. 28-29.
Push and hold “Select” button until Stand-by appears. (Do Not put the vent in stand-by)
Rotate Knob -> until you see “Vent Config” -> press Select Rotate Knob -> until you see “O2 Cyl Dur” ->Press Select Rotate Knob -> until you see “Cyl Type” -> Press Select -> Enter maximum cylinder volume by rotating the knob->Press Select when the correct volume (This is the total volume of the tank, not what is in it currently i.e. (D = 350L) (E = 625L) (Bell 407 = 2545) Rotate Knob -> until you “Cyl Pressure” ->Press Select -> Enter current tank pressure from the gauge ->Press Select The duration will be displayed for 60 sec. or until msg. acknowledge by pushing the Select or Exit button The Revel should automatically take all parameters into consideration when calculating
This cannot be done with the LOX system. You need to do the math manually. Determine what you have onboard vs. the pt’s. rate of consumption
Don’t Forget
Bias Flow
The Revel produces 3 – 10 Liters of Bias Flow per minute. This must
be added into the pt’s. minute volume calculation to determine
the true amount of gas being utilized, if you are doing manual
calculations.
Most of our vents have the Bias Flow set at 5 LPM
FiO
Oxygen consumption will vary depending on set FiO At 100%, the total volume is supplied from the Oxygen tank. At anything less, the Oxygen is mixed with ambient air therefore consumption from the tank is less.