The gauge on an E cylinder of O2 reads 800 psig. Approximately how long would the contents of this cylinder last, until completely empty, at a flow of 3 L/min?
a. 1 hr 15 min
b. 1 hr 45 min
c. 2 hr 10 min
d. 2 hr 40 min
ANS: A
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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