During inspection of the shoulder of a compressed gas cylinder, ...

[formula1]

During inspection of the shoulder of a compressed gas cylinder, you note an asterisk () next to the test date. This indicates what about the cylinder?
 
  a. It is made of spun aluminum, not steel.
  b. It only requires a 10-year DOT testing.
  c. It can be filled to 10 above its service pressure.
  d. It has a high coefficient of elastic expan-sion.

Question 2

The gauge on a G cylinder of O2 reads 400 psig. Approximately how long would the contents of this cylinder last, until completely empty, at a flow of 5 L/min?
 
  a. 2 hr 40 min
  b. 3 hr 10 min
  c. 4 hr 30 min
  d. 9 hr 15 min

[SVictor]

Answer to Question 1

ANS: B
An asterisk () next to the test date indicates DOT approval for 10-year testing.

Answer to Question 2

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)

[formula1]

Thank you

[SVictor]

No problemo