The K cylinder at a patient's bedside contains 1300 psig and is using 7 L/min. It will take ap-proximately _____ hours to use 800 psig
a. 3.7 c. 6
b. 9.7 d. 4
ANS: C
Amount of time left in cylinder = (cylinder pressure ? cylinder factor)/flow rate of gas (li-ters/minute). K factor = 3.14. Time to use 800 psi = (800 ? 3.14)/7 = 358.8 min/60 = 5 hours 59 minutes.
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