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Author Question: A cylinder of N2O has a gauge pressure of 750 psig when full. What will be the pressure in this ... (Read 111 times)

go.lag

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on: Jul 16, 2018
A cylinder of N2O has a gauge pressure of 750 psig when full. What will be the pressure in this cylinder when it is half full?
 
  a. 375 psig
  b. 750 psig
  c. 1500 psig
  d. 2200 psig

Question 2

Which of the following mechanisms do all compressed gas cylinders use to avoid excessively high buildup of cylinder pressure?
 
  a. Internal convection cooling mechanism
  b. Pressure-relief mechanism on the valve stem
  c. Automatic cylinder breech mechanism
  d. Pressure-relief mechanism on the cylinder body pressure relief valves.


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Sarahjh

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

ANS: B
Figure 40-6 compares the behavior of compressed gas and liquid gas cylinders during use. The vapor pressure of liquid gas cylinders varies with the temperature of the contents. For example, the pressure in a nitrous oxide cylinder at 70 F is 745 psig; at 60 F, the pressure decreases to 660 psig. As the temperature increases toward the critical point, more liquid vaporizes, and the cylinder pressure increases.

Answer to Question 2

ANS: B
Should the temperature increase too much (as in a fire), the high gas pressure could rupture and explode the cylinder. To prevent this type of accident, all cylinders have high-pressure relief valves.


go.lag

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Reply 2 on: Jul 16, 2018
Thanks for the timely response, appreciate it

cpetit11

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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