The gauge on an H cylinder of O2 reads 2000 psig. Approximately how long would the contents of this cylinder last, until completely empty, at a flow of 6 L/min?
a. 1 hr 30 min
b. 17 hr 30 min
c. 18 hr 10 min
d. 21 hr 50 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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