An E size oxygen cylinder with 2000 psig in it is being used at 4 ...

[DelorasTo]

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

Question 2

An E size cylinder with 1600 psig is used to provide oxygen to a simple mask running at 5 L/min during a transport. The cylinder will last:
 
  a. 8 hours. c. 68 minutes.
  b. 56 minutes. d. 89 minutes.

[amynguyen1221]

Answer to Question 1

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.

Answer to Question 2

ANS: D
Amount of time left in cylinder = (cylinder pressure  cylinder factor)/flow rate of gas (li-ters/minute). E size factor = 0.28. A simple mask should run at a minimum of 5 L/min. There-fore, (1600  0.28)/5 L/min = 448/5 = 89.6 minutes.