After connecting an oxygen regulator to an H cylinder and turning ...

[Garrulous]

After connecting an oxygen regulator to an H cylinder and turning the direct-acting valve on, the respiratory therapist attempts to turn on the flow of oxygen. The desired gas flow is not achieved.
 
  Which of the following is (are) the most likely problem(s)?
  1. The therapist is using the wrong regulator.
  2. The pressure in the cylinder is inadequate.
  3. The regulator outlet is obstructed.
  4. There is a leak in the connection between the cylinder outlet and the regulator.
  a. 1 c. 2 and 3
  b. 2 and 4 d. 1, 2, and 4

Question 2

A full H size cylinder is used to provide oxygen to an air-entrainment mask at 6 L/min. If the cylinder is replaced at 500 psig, how long will it last?
 
  a. 5 hours c. 10 hours 50 minutes
  b. 10 hours 20 minutes d. 15 hours 23 minutes

[mochi09]

Answer to Question 1

ANS: C
Failure to achieve a desired gas flow from a cylinder regulator can result from inadequate pres-sure or from an obstruction at the regulator outlet. There would be a hissing noise if there was a leak. Safety systems prevent the wrong regulator from fitting an oxygen cylinder.

Answer to Question 2

ANS: D
Amount of time left in cylinder = (cylinder pressure  cylinder factor)/flow rate of gas (li-ters/minute). H cylinder factor = 3.14. Full-size H cylinder = 2265 psig. If the cylinder is changed at 500 psi, then 2265  500 = 1765 (1765 psi will be used). (3.14  1765)/6 L/min = 923.7 minutes/60 = 15 hours (0.39  60) = 15 hours 23 minutes.

[Garrulous]

TYSM

[aliotak]

Gracias!