The OR environment and anesthesia machine Flashcards
How many liters of oxygen are in a tank?
660 L
What is the total pressure of 1 oxygen tank?
2200 psig
How do you determine the residual nitrous oxide in a tank?
Weigh the cylinder
What is the equation for how long a cylinder is going to last?
Total liters/ rate = minutes
Example:
330L tank / rate of 3L/min = 110 minutes
How much time do you have with a full tank of oxygen going at 10L/min before it runs out?
66 minutes
What is the importance of Wood’s metal?
It is a metallurgic alloy that has a low melting point so it allows dissipation of pressure to keep bottles of gas from bursting due to heat
At what pressure is the pressure relief valve designed to burst?
3300 psig
What is psig?
Pounds per square inch
What is th critical temp of nitrous oxide?
36.5 Celsius
Why can it be kept at room temperature as a liquid?
Because room temperature is below its critical temperature
How can gases be liquefied by pressure?
Only if store below their critical temperature
What is the pressure of a nitrous oxide tank?
745 psig
What will happen to nitrous oxide if kept at a constant temp?
It will vaporize at a steady rate and maintain a constant pressure until liquid is gone
Why is nitrous oxide cold?
Because energy is lost in the conversion of liquid to gas in the form of heat
What is the color of the medical vacuum receptacles
Black with white lettering
What is the color of the WAGD receptacles
Lavender
How is crossover prevented in cylinders of gas?
The pin index safety system
Which gases have am interchangeable pin?
Oxygen and CO2
What color is the nitrogen tank?
Black
What color is the nitrous oxide tank?
Blue
What makes sure there is no wrong connections to the anesthesia machine?
Pin index safety system
When is the PISS defeated?
By multiple washers between the cylinder and the yoke
Or if yoke pins are damaged
Or if cylinder is filled with the wrong gas
What should the humidity of the room be at?
50-55%
What does dry air do?
Facilitates the movement of particulate matter - airborne stuff!
What does humid air do?
Decreases integrity of barrier devices
