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