An "E" size oxygen cylinder with 2000 psig in it is being used at 4 L/min. How much will be used in 45 minutes?
a. 26.2 psig c. 180 psig
b. 140 psig d. 643 psig
ANS: D
Amount of time left in cylinder = (cylinder pressure ? cylinder factor)/flow rate of gas (li-ters/minute). (2000 ? 0.28)/4 = 140 minutes to use up 2000 psig. Therefore, 2000 psig/140 min = X psig/1 minute X = 14.3 psig/min ? 45 minutes = 642.8 psig.
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