Exam 3 Compressed Gases and Vaporizers (Mix of Grayson/Cooper) (7/1/24) Flashcards
Which gasses are non-liquefied gasses?
- Oxygen
- Nitrogen
- Helium
- Air
Which gasses are liquefied?
- Nitrous Oxide
- Carbon Dioxide
At what pressures does a liquefiable gas become liquefied?
25 - 1500 psi
What aspect of the goverment regulates gas purity?
FDA
What aspect of the goverment regulates marking, labeling, storage, & handling?
DOT
What aspect of the goverment regulates employee safety?
OSHA
The base of a gas tank has what shape?
Flat or Concave
What material are gas tank valves made from?
Bronze or brass
These allow refilling and discharge of gas
What should be attached to every single gas cylinder?
Handle
What vents cylinder contents to the atmosphere if the pressure increases to a dangerous level?
Pressure relief device
disc or plug
What is the PIS system?
Pin Index Safety System = Holes and cylinder valve that only work with the correct pins on the yoke/pressure regulator.
What is the smallest cylinder size?
What is the biggest?
What cylinder size is used for anesthesia machines?
A = smallest
H = Largest
E = Anesthesia
D = Transport
What is the approximate PSI from the cylinder supplying gas to the machine?
45 psi
Why must the gas cylinders on the back of our machines always remain closed?
As a safety mechanism so that if the wall pressure fails, we will have an audible alarm to alert us that we are needing to switch from wall pressure to tank pressure and we only have minutes of oxygen left.
(Kane talked about this on slide 8)
What is the pressure-volume relationship of a non-liquefied stored gas?
As pressure decreases, so does volume
Approximate psi of full non-liquified gases in a cylinder:
What about the volume in a full tank?
1900 or 2000 psi (Range)
Approximately 600 L
What is the relationship between pressure and volume for a liquefied gas?
- Pressure dependent on vapor pressure so pressure is not an indicator of remaining volume.
For a tank of nitrous, almost all of the time the tank psi will read ___. Except for when the tank is almost completely empty, when it will read ___.
745 psi
350 psi
What are some DOT regulations for what has to be placed on a gas tank?
- Service pressure
- Test Date
- Caution label (Diamond shape)
- Manufacturer info
- Expiration date
How often should the gas cylinder valves, regulators, and gauges be lubricated?
Trick question. Never.
A gas cylinder should never be exposed to temperatures above _____.
54° C (130° F)
What are standards for storage rooms for gas cylinders?
Which of the following statements are true regarding checks/safety standards prior to use of oxygen cylinders?
(Select 3)
A. Open the tank valve quickly to ensure rapid flow.
B. Open the valve after bringing the cylinder to the patient.
C. Inspect the pin index holes, label and regulator prior to use.
D. Face the valve outlet toward the patient/operating field.
E. Ensure there are at least 2 washers in place.
F. Remove the tamper seal.
G. Check the service pressure.
C. Inspect the pin index holes, label and regulator prior to use.
F. Remove the tamper seal.
G. Check the service pressure.
Rationale: We want to open the tank slowly. We are supposed to open the valve before bringing the cylinder to the patient. We want to face the valve outlet away from people. There should only be one washer in place.
What is used to deliver non-flammable gasses (O₂ , N₂O, medical air) to anesthetizing locations and other patient care areas?
Pipeline systems
What are the 3 components to the “Pipeline Systems”?
- Central Supply
- Piping (Received at 50 psi)
- Terminal units (approx. 50 psi)
How many days of oxygen should a central supply for a hospital “bank” for emergencies?
2 days worth
What are the benefits of a liquid supply/storage of gas?
- less expensive & convenient to store
- refilled via supply trucks
- no interruption to service
What are the three classes of piping?
- Main - connect gas source to risers
- Risers - vertical pipes connecting mainline w/ branch lines on each level of hospital.
- Branch - section supplying rooms on one level of facility.
What permits specific areas of a piping system to be isolated for problems and maintenance?
Shut-off Valves
Area alarm systems are found in _______ areas.
critical life support
Should the area alarm systems alarm in the following circumstances?
Normal Line Pressure: 45 psi –> New Pressure –> 61 psi
Normal Line Pressure: 50 psi –> New Pressure –> 42 psi
Normal Line Pressure: 60 psi –> New Pressure –> 46 psi
Normal Line Pressure: 45 psi –> New Pressure –> 61 psi
* YES ( > 20% Change)
Normal Line Pressure: 50 psi –> New Pressure –> 42 psi
* NO (< 20% Change)
Normal Line Pressure: 60 psi –> New Pressure –> 46 psi
* YES (> 20% Change)