The gauge on a G cylinder of O2 reads 400 psig. Approximately how long would the contents of this cylinder last, until completely empty, at a flow of 5 L/min?
a. 2 hr 40 min
b. 3 hr 10 min
c. 4 hr 30 min
d. 9 hr 15 min
ANS: B
Once the factor for a given gas and cylinder is known, calculating the duration of flow is a sim-ple matter of applying the following equation:
Duration of flow (min) = Pressure (psig) ⋅ Cylinder factor/Flow (L/min)
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