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NU 568
Exam 4 - Medical Gases
| Question | Answer |
|---|---|
| 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
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