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