Author Question: A G size cylinder with 2000 psig is used for 6 hours at 5 L/min. How much gas was used dur-ing this ... (Read 41 times)

DelorasTo · **on:** Jul 16, 2018

A G size cylinder with 2000 psig is used for 6 hours at 5 L/min. How much gas was used dur-ing this time?

a. 2000 psig c. 573 psig
b. 750 psig d. 107 psig

Question 2

The function of the vaporizer of a liquid bulk oxygen system is to:

a. act as a pressure release.
b. reduce the pressure to 50 psig.
c. convert liquid oxygen to gaseous oxygen.
d. allow heat to be released into the envi-ronment.

miss_1456@hotmail.com · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
Amount of time left in cylinder = (cylinder pressure cylinder factor)/flow rate of gas (li-ters/minute). G factor = 2.41. Time to use 2000 psig = (2000 2.42)/5 = 964 minutes/60 = 16 hours. 2000 psig /16 hours = X psig/6 hours. X = 750 psig will be used in 6 hours at 5 L/min.

Answer to Question 2

ANS: C
The reservoir stores a mixture of liquid and gaseous oxygen. The vaporizer acts as a heat ex-changer where heat is absorbed from the environment and used to warm the liquid oxygen to room temperature, thus forming gaseous oxygen.