Gas Therapy Flashcards
Cylinder color Brown/Green
Heliox
Must always be mixed with at least 20% oxygen.
Applications for heliox
Partial (large) airway obstruction.
Delivery device for heliox
Non-rebreathing mask
How do you get the actual flow rate for 70:30 He/O2
Multiply the flowmeter setting by1.6
How to get the actual flow rate for 80/20 He/O2
Multiply the flowmeter setting by 1.8
Manufacture of oxygen
Fractional distillation.
Cylinder color code for oxygen
Green (international = white)
Medical air cylinder color code
Yellow
Carbon dioxide cylinder color code
Gray/green
Nitrous oxide cylinder color code
Light blue
FDA is responsible for
Labeling of medical gases.
(Gas contents, purity level, flammability hazards, manufacturer name)
* is the only way to correctly identify contents of cylinder
DOT or ICC regulatory agency is responsible for
Seamless steel tested every 10 years
What does a star indicate on cylinder
That it is good for 10 years
How much gas can an E cylinder hold
22 cu. ft. Of O2
How much can an H cylinder hold
244 cu. ft. Of O2
What is the PISS system
Cylinders have varying pin locations, high-pressure relief valves,
Always make sure washer is present.
What does the ASSS system do
Differs thread pitches, internal left and right hand threads and external threading
Diameter index safety system
DISS
Designed to prevent accidental connections of low pressure (<200 psi) medical gases
Duration of gas flow from cylinders equation
How many liters are in 1 cu. ft.
Duration (minutes)= cylinder factor (L/psig) x gauge pressure/ flow rate (lpm)
28.3 liters in.1 cu. ft.
What is the gauge pressure when cylinder is full?
2200 psig
Duration of liquid oxygen container equation
1 liter of liquid gas = 2.5 lbs = 860 L of gaseous gas
Amount of gas = weight of cylinder x 860 / 2.5 pounds
What does the reducing valve reduce gas pressure to?
50 psi
Thorpe tube flowmeter trouble shooting
If a massive leak occurs after removing flowmeter from wall what should you do?
Plug it back into wall
Thorpe tube flowmeter trouble shooting
If you notice continuous bubbling in humidifier with the needle valve closed
The valve seat is worn, replace the flowmeter .
