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Medical Gas Systems
CRNA Medical Gas Systems Dorsch and Dorsch
77
Medical
Graduate
05/20/2009

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Cards

Term
Difference btw the measured pressure and the surrounding atmospheric pressure.
Definition
Psig
Term
Pounds per square inch
Definition
Psi
Term
Psig + local atmospheric pressure.
Definition
Psia
Term
This measurement is the most common and measures zero at atmospheric pressure.
Definition
Psig
Term
This measurement measures 14.7 at sea level.
Definition
Psia
Term
This measurement has a complete vacuum as its reference point.
Definition
Psia
Term
A material or mixture with a Psia of 40 at 70F or 104 at 130F, or a liquid with greater than 40 Psia at 100F all have what thing in common?
Definition
All three instances illustrate compressed gases.
Term
_______ is the maximum pressure at which the cylinder may be filled at 70F.
Definition
Service pressure
Term
Oxygen, Nitrogen, Helium and air are examples of liquified/nonliquified compressed gases.
Definition
Nonliquified.
Term
CO2 and N2O are examples of liquified/nonliquified compressed gases.
Definition
liquified.
Term
A nonliquified compressed gas does/does not liquify at ordinary temps and at pressures up to 2500 psig.
Definition
does not
Term
Besides knowing that liquified compressed gases are ones which become liquid at pressures from 25-2500 Psig and at normal temperatures, what is another way to remember this fact?
Definition
The "oxides" liquify...CO2 and N2O.
Term
Low or high pressure: Medical gas cylinder.
Definition
High. It can be in excess of 2000 Psig, and can be a gas or gas mixture.
Term
Cylinders contain compressed gases in which two forms: ______ or ______.
Definition
Gas, liquid
Term
Anesthesia systems use these 2 types of gas supplies: _______ and _______
Definition
Cylinders, central pipeline
Term
Pharmacopoeia of the US sets what regulation?
Definition
Purity standards for medical gases
Term
The FDA regulates what standard in anesthesia?
Definition
Medical gas regulation
Term
The DOT and TC regulate what with regards to anesthesia?
Definition
Anything related to testing, filling, marketing, transporting, maintaining, wasting, etc of the gas cylinders and containers.
Term
Most of these are made from steel, but some have aluminum to make them lighter.
Definition
Medical gas cylinders
Term
Made of bronze or brass. This is where the cylinder is filled and discharged.
Definition
Valve
Term
Point of exit for the gas. Do not confuse this for the conical depression opposite the valve.
Definition
Port
Term
Closes the valve by sealing against the seat.
Definition
Shaft or stem
Term
Most common valve (made of bronze or brass), AKA "direct acting valve".
Definition
Packed valve
Term
Stem is continuous with the seat.
Definition
Packed valve
Term
Stem is not continuous with the seat.
Definition
Diphragm valve.
Term
Why is it called a "packed valve"?
Definition
Because it is "packed" with Teflon around the threads to prevent leaking.
Term
If you turn the stem on a large packed valve the ______ turns in its thread.
Definition
seat
Term
Fully opens using 1/2 to 3/4 turn
Definition
Diaphragm valve
Term
Less likely to leak and is more expensive
Definition
Diaphragm valve.
Term
With a diaphragm valve, turning the handle clockwise forces the diphragm up/down and closes the seat.
Definition
down
Term
With a diaphragm valve, the ______ closes the valve.
Definition
spring
Term
This is used to open or close a cylinder valve.
Definition
Handle or handwheel
Term
This allows for discharge of cylinder contents through the atmosphere if the interior pressure becomes too great.
Definition
Pressure relief device
Term
Wood's metal is a common _______.
Definition
Fusible plug
Term
This is a type of pressure relief device that is thermally operated and melts at a "yield temperature".
Definition
Fusible plug
Term
This is a type of pressure relief device that ruptures to allow for discharge of contents into the atmosphere.
Definition
Rupture disc or Frangible disc
Term
This is a type of pressure relief device that can be used to prevent bursting of the cylinder unless the temp is high enough to melt the fusible plug.
Definition
Combination of a rupture disc and fusible plug
Term
T/F with pressure relief devices, you cannot control how much of the gas escapes; it's all or nothing.
Definition
True. Valves are better controlled.
Term
A spring-loaded device that closes to prevent discharge of contents after normal pressures are restored.
Definition
Pressure relief valve
Term
On a pressure relief valve, the set pressure for discharge is located on the _____.
Definition
Valve
Term
Pressure relief devices or pressure relief valves are more likely to leak.
Definition
Pressure relief valves, however, when discharged, you can control how much gas escapes with a valve versus a device.
Term
This sits above the safety device and receives the retaining screw of the yoke.
Definition
Conical depression
Term
Consists of holes on the cylinder valve located in an arc below the outlet port (valve port).
Definition
Pin index safety system
Term
T/F If a cylinder has a mixture of gases, the colors of the different gases must be viewed from the top of the cylinder.
Definition
True
Term
Pin Index Safety systems are used on all cylinders sizes ____ to ____.
Definition
A-E
Term
Valve outlet connections for large cylinders are threaded beginning with letter _____.
Definition
M
Term
This is the most common cylinder size for US anesthesia machines.
Definition
E
Term
Psig for O2 on E cylinder
Definition
1900 (more than N2O)
Term
Psig for N2O on E cylinder
Definition
745 (less than O2)
Term
Liters of N2O on E cylinder
Definition
1590 (more than O2)
Term
Liters for O2 on E cylinder
Definition
660 (Less than N2O)
Term
Pounds of N2O on E cylinder
Definition
6.4 (More than O2)
Term
Pounds of O2 on E cylinder
Definition
1.9 (less than N2O)
Term
You are delivering O2 at a rate of 3L/min, and the Psig reads 300. How much time do you have left before the O2 runs out?
Definition
O2 is a nonliquified gas, so it's pressure will steadily decline as its contents decrease. Multiply Psig 300 by 0.3 to get the number of liters left...90L. Divide 90L by the flow rate of 3L/min = 30 minutes remaining.
Term
T/F Cylinders are inspected and tested every 5 years, or 10 years with a special permit.
Definition
T. It's also permanently stamped on the cylinder
Term
What can happen if oils come into contact with valves, regulators, guages or fittings containing O2 or N2O?
Definition
An explosion may occur
Term
This is the most easily damaged part of the cylinder.
Definition
The valve
Term
Liters for air in an E cylinder
Definition
625
Term
Psig for air in an E cylinder
Definition
1900
Term
Avoid placing cylinders at what two temperature ranges?
Definition
above 125F and below 20F
Term
How do you identify the contents of a cylinder?
Definition
Read the label
Term
Is it ok to transport a cylinder in a basket under a hospital bed or gurney?
Definition
Yes
Term
If you have no way to secure a cylinder, what is the best position to store it in?
Definition
laying on its side (but people may trip over it)
Term
How should you clear foreign material from the outlet?
Definition
"crack" the valve with the port pointed away from people
Term
What should you do before removing a cylinder from a regulator or yoke?
Definition
Close the valve and release all of the pressure
Term
Only qualified personnel should transfill a cylinder due to the danger of increase in ______ to cause ______ or ______ of metals.
Definition
temperature, combustion, oxidation
Term
1% is how many ppm?
Definition
10,000
Term
For O2 to be "pure", how pure is it really?
Definition
99%
Term
Of the 1% that is "impure" with regards to an O2 gas, how much CO2, CO and N2 are permitted?
Definition
CO2 = 300 ppm, CO = 10 ppm, N2 = 5 ppm
Term
What is the max amount of contaminants that can be in "pure" oxygen?
Definition
9685ppm
Term
LOX containers are regulated by the DOT/Pharmacopoeia?
Definition
DOT
Term
What should you do to control the pressure in a LOX CONTAINER?
Definition
vent the gas...this limits the time LOX can be stored
Term
What should you NEVER, under ANY circumstances do to a LOX container?
Definition
Never tamper with the pressure relief valve...do not loosen, tighten, etc.
Term
Boiling point for LOX
Definition
-297 F
Term
How does LOX remain cold?
Definition
By "latent heat of vaporization"
Term
What does DISS stand for and where is it located?
Definition
Diameter Index Safety System, at the back of the anesthesia machine (color coded)
Term
What is one way to override the PISS?
Definition
Using more than one washer (gasket). This can also allow for an un-tight gas seal.
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