Cylinder Flow Duration (CFD)
Info
Cylinder type D Tank E Tank G Tank H Tank K Tank M Tank
PSI 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200
Liters of flow 0.25 liters/min 0.5 liters/min 1 liter/min 1.5 liters/min 2 liters/min 3 liters/min 4 liters/min 5 liters/min 6 liters/min 7 liters/min 8 liters/min 9 liters/min 10 liters/min 11 liters/min 12 liters/min 13 liters/min 14 liters/min 15 liters/min
R e s u l t s
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CFD
 
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Cylinder Flow Duration (CFD)

Oxygen cylinders are available in a variety of sizes, namely D, E, G, H, K, and M. The Cylinder Flow Duration (CFD) refers to the length of time that a cylinder will supply oxygen at a particular flow rate.

Formula Used:
CFD = [factor × (psig remaining in cylinder - 200)] / Liters of flow

The cylinder conversion factors as per the tank type are

  • D Tank = 0.16
  • E Tank = 0.28
  • G Tank = 2.41
  • H/K Tank = 3.14
  • M tank = 1.56

Data the user will need:

  • Type of cylinder
  • Gauge pressure (psig)
  • Liters of flow (liters/min)

Abbreviations used:
CFD = Cylinder Flow Duration

Interpretation:

User need to enter the above mentioned values, which are used in the formulas given below

  • CFD = [factor × (psig remaining in cylinder - 200)] / Liters of flow

Reference:
Airway. In: Gulli B, Chatelain L, Stratford C, eds. Emergency Care and Transportation of the Sick and Injured, 9th ed. Sudbury, MA: Jones and Bartlett Publishers; 2005:210-255.