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Author Question: The gauge on an H cylinder of O2 reads 2000 psig. Approximately how long would the contents of this ... (Read 65 times)

aabwk4

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on: Jul 16, 2018
The gauge on an H cylinder of O2 reads 2000 psig. Approximately how long would the contents of this cylinder last, until completely empty, at a flow of 6 L/min?
 
  a. 1 hr 30 min
  b. 17 hr 30 min
  c. 18 hr 10 min
  d. 21 hr 50 min

Question 2

Under what conditions will the gauge pressure of a cylinder of N2O accurately represent its con-tents?
 
  1. When the liquid in the cylinder has completely vaporized
  2. When the ambient temperature exceeds the critical temperature
  3. When the filling density is less than 1.0 (water-filled)
  a. 1 and 2 only
  b. 1 and 3 only
  c. 2 only
  d. 1, 2, and 3


poopface

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: B
Once the factor for a given gas and cylinder is known, calculating the duration of flow is a sim-ple matter of applying the following equation:
Duration of flow (min) = Pressure (psig)  Cylinder factor/Flow (L/min)

Answer to Question 2

ANS: C
Should a cylinder of nitrous oxide warm to 97.5 F (its critical temperature), all the contents would convert to gas. Only at this temperature and above does the cylinder gauge pressure accu-rately reflect cylinder contents.


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