A full "H" size cylinder is used to provide oxygen to an air-entrainment mask at 6 L/min. If the cylinder is replaced at 500 psig, how long will it last?
a. 5 hours c. 10 hours 50 minutes
b. 10 hours 20 minutes d. 15 hours 23 minutes
ANS: D
Amount of time left in cylinder = (cylinder pressure ? cylinder factor)/flow rate of gas (li-ters/minute). H cylinder factor = 3.14. Full-size "H" cylinder = 2265 psig. If the cylinder is changed at 500 psi, then 2265 – 500 = 1765 (1765 psi will be used). (3.14 ? 1765)/6 L/min = 923.7 minutes/60 = 15 hours (0.39 ? 60) = 15 hours 23 minutes.
Health Professions
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