An "E" size oxygen cylinder with 2200 psig has a set flow rate of 2 L/min. It will take _____ hours and _____ minutes until the gauge pressure reaches 400 psig
a. 5; 30 c. 4; 30
b. 5; 6 d. 4; 12
ANS: D
Amount of time left in cylinder = (cylinder pressure ? cylinder factor)/flow rate of gas (li-ters/minute). 2200 – 400 = 1800 psig (the amount of gas that will be used). (1800 ? 0.28)/2 = 252 minutes/60 = 4 hours 12 minutes.
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