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NU 568

Exam 4 - Medical Gases

QuestionAnswer
What is critical temperature? The temperature at which a gas can be liquefied
What regulating body issues regulations for cylinders and which organizations contribute to these standards? Regulating body=USDOT, Contributing bodies=Compreessed Gas Association (CGA), National Fire Protection Association (NFPA)
In what state is oxygen stored at room temperature? When refrigerated? Room=compressed gas; Refrigerated=liquid
Manifolds in the AM reduce cylinder pressure to _____ psi. 50
Liquid O2 is stored at _______ celsius. -119
What condition must be met in order for gas to be liquefied? Stored below critical temperature
What is the capacity and service pressure of an O2 E-cylinder? 660L and 2000psi
What 3 steps should be taken in an O2 pipeline pressure loss situation? 1)open E-cylinder to max 2)d/c AM from pipeline 3)consider low FGF
Why should the E-cylinder be maximally opened with pipeline pressure loss? Flow may end b/f the cylinder is completely empty
Disconnection from pipeline supply occurs at what point in the gas delivery system? Quick connect fitting
What is a quick equation to determine the amount of remaining liters of gas in an O2 cylinder? Remaining psi x 0.33
What is the capacity and working pressure of N20? 1600L and 745 mmHg
What chemical form is N2O stored in? Liquid
What is the critical temperature of nitrous oxide? 36.5 celsius
Nitrous oxide is prepared by the thermal decomposition of what chemical? Ammonium nitrate
Nitrous (does/does not) require large increases in tank pressure in order to compress it for storage. Does not
When should a N2O tank be changed? When the tank pressure begins to drop
What is the purpose of emergency relief valves (aka. rupture discs)? Prevent explosion of a cylinder under high pressures (i.e. overfilling)
At what pressure will a relief valve rupture? 3300psi
E-cylinders can withstand pressures of >_____ psi. 5000
How does Wood’s Metal function? Placed b/w the valve block and cylinder body; melts at 158F to allow for escape of cylinder contents in a controlled fashion
What is the most common pressure relief device and how does it work? Burst disc that ruptures at a pre-determined pressure
The used volume an a nitrous cylinder (is/is not) proportional to the cylinder pressure. Is not
How many liters of N2O remain when the cylinder pressure begins to fall? 400L
What are possible reasons why an N20 cylinder gauge would read higher than 745psi? Gauge malfunction, overfilled tank, gas other than N20 in the cylinder
What is tare weight? Empty weight of a cylinder
What is the tare weight of an O2 cylinder? 5.9kg
What is the only reliable way to determine the residual volume of N20 in a cylinder? Weight the cylinder
When will an N2O tank start to lose pressure? When approximately 400L remain
What is the rule of thumb regarding N2O tanks? When the pressure starts to drop below service psi, replace the tank
What is the critical temperature of air? -140.6C
What gas is provided by compressor pumps? Medical air
True/False: The pressure of medical air in a cylinder falls in proportion to the tank content. True
True/False: Medical air is sterile when provided to the AM. False--inline filters and water traps help remove impurities from the unsterile air
What are the PISS numbers for: air, oxygen, nitrous, and carbon dioxide? A-O-N-C = 15-25-35-16
How many liters does an H cylinder hold? 6900
An H cylinder is _____x larger than an E cylinder. 12
Where are zone valves located? Outside of the OR
True/False: Compressed nitrogen is administered to patients for anesthetic purposes. False
What is the purpose of compressed nitrogen? Power mechanical equipment (i.e. drills)
What type of tank is used to store compressed nitrogen? H cylinders
Nitrogen tanks are generally _______ controlled. regulator
What gas is used for insufflation during laparoscopy? CO2
What colored tank denotes CO2 as its content? Gray
True/False: Color coding of tanks and gases is mandatory per FDA regulations. False
When do most problems occur with cross connections? New system setups or repairs
What standards is the American Society of Sanitary Engineering (ASSE) involved in? Professional qualifications of inspectors and verifiers of medical gas systems
True/False: Anesthesia providers are not responsible for participating in and involvement with the process of medical gas systems. False--anesthesia is obligated to ensure the proper design and function of the entire porcess
What are gas pipes constructed of? Seamless copper tubing
What system helps prevent connection errors from pipeline supply to the anesthesia machine? Diameter Index Safety System (DISS)
What are the 4 tests that anesthesia gas circuits undergo prior to patient use? Pressure, cross-connect, pipeline purge, standing pressure
The 4 systems tests for anesthesia gas circuits are performed in accordance with what requirements? ASSE 6000 requirements
What gas is used to blow gas lines free of debris? Humidity and contaminant free nitrogen
What gas is used to pressurize gas systems when checking for leaks? nitrogen
Created by: philip.truong