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The tank has 2200 psig of which 200 psig cannot be used, so subtract 200 from 2200 to get 2,000 psig that is actually usuable per hospital policy.
Find the conversion factor to convert psig into available liters of oxygen:
Available liters = 2,000 x 0.28 = 560 L
The length of time the cylinder will last is available liters divided by flow rate in liters per minute.
560 L / 4L/min= 240 min = 4 hours
All of the calculations are done in a similar fashion.