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37 Cards in this Set
- Front
- Back
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The anes machine is a workstation that includes...
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The anesthesia machine
Breathing systems Ventilators Scavenging systems Suction system Monitors Data management systems |
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What is a compressed gas?
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Any material or mixture with an absolute pressure >40lb/in2 (psi) at 130F, or flammable liquid with a VP exceeding 40 psi at 100F
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Who controls the design, construction, testing, filling, handling and transportation of cylinders?
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US DOT
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Who controls safety of healthcare workers?
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OSHA
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Cylinders are made of what? When are they tested?
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Made of steel or alloys (alluminum used in MRI)
Tested every 5 years, 10 years w/special permit |
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How much does an E tank hold? An H tank?
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E tank O2: 660 L and 1900 psig
H tank O2: 6900 L and 2200 psig |
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The colored diamond on a cylinder indicates what 2 things?
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Indicates if gas is:
Oxidizer (yellow) Flammable (Red) Nonflammable (Green) and Risk of release of contents: DANGER (immediate danger) WARNING (less than immediate danger) CAUTION (no immediate danger) |
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Which way do you open a cylinder valve?
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Couterclockwise
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If a valve stem is broken, what can happen?
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Escape of gas at very high pressure....tank becomes a self-propelled missile
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What does the pressure relief device prevent against?
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Prevents rupture of cylinder in event of high pressures or temperatures
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What are the 4 different pressure relief devices on a cylinder?
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1. Rupture disk--ruptures w/excessive pressure
2. Fusible plug--metal alloy, prevents rupture of tank in event of fire but not overfilling 3. Combo rupture disk/fusible plug--functions when high temp and excessive pressures 4. Pressure relief valve--spring loaded device, opens with excessive pressures and closes after nml pressure is restored |
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o2:
MW? Physical state? Critical temp? Cyilnder color? E Cylinder (L)? E cylinder (psi)? |
MW: 32
Gas CT: -116 (why its always a gas) Green 660L 1900 psi |
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N2O:
MW? Critical temp? Cyilnder color? E Cylinder (L)? E cylinder (psi)? |
MW: 44
Liquid CT: 36.5 Blue 1590 L 745 psi |
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Psig
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psi gauge; difference bt measured pressure and atmospheric pressure (reads 0 at atm)
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Psia
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Psi absolute (psig + atmos pressure)
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What will the pressure gauge read for a compressed gas?
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Will read the accurate amount in the gauge. Pressure in cylinder will dec as volume decreases.
Pressure can be used as an indicator of volume! |
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What will the pressure gauge read for a liquefied gas?
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Pressure in cylinder is dependent on vapor pressure of liquefied gas.
Pressure remains constant until ALL liquid has evaporated |
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If a N2O pressure gauge reads ~50 L, how much remains?
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16%
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Vaporization of liquids requires....
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...energy in the form of heat.
With large gas flows (>4LPM), tank cools as liquid vaporizes and water may condense or freeze on the tank or valves |
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How can you indicate the volume of a liquified gas in tank?
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Frost line on tank indicates level of liquid contents
Avogadros Law used to calculate tank contents |
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Tanks are attached to anes machine by a _____ ______ located at side/rear of machine
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yoke assembly
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Hanger Yoke contains what 6 things?
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1. Cylinder pressure gauge or digital indicator
2. Filter to prevent dirt from entering machine 3. Retaining screw/clamping device to hold cylinder in place 4. Inlet port for gas w/washer 5. Check valve to prevent loss of gas from machine and transfilling of tanks 6. Color coding for gas |
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What is the PISS?
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Pin Index Safety System
Prevents attachment of wrong cylinder to gas inlet on machine Holes in cylinder correspond to pins on yoke of machine |
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What is the purpose of a cylinder pressure regulator?
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Reduces high, variable tank pressure (at 1900 psi) to approximately 45 psi (slightly less than pipeline pressure!)
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What vents excess cylinder pressure to the atmosphere?
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pressure relief valve
*Ohmeda has 2nd regulator that reduces from 45psi to 14psi to deliver a constant pressure to flowmeters |
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Pipeline pressures of O2 and N2O are regulated to what psi?
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O2: 50psi
N2O: 160 psi |
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What 3 ways is pipeline pressure regulated?
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Pressure alarms--located upstream of anes area and shut off valves. Activated by high/low line pressures (+- 20%), and also use of reserve supply
Pressure relief valves--open at 50%> normal line pressure Manual shutoff valves located outside each OR |
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What is the DISS?
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Diameter Index Safety System
Non-interchangable low pressure connection system (<200 psi). Diameter of inner and outer bore of hose connection correspond to inlet connection on machine Machine inlet has check-valve |
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What things stay on when you put machine in OFF/standby mode?
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Electrical power off BUT
O2 on Battery charger and outlets active |
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Backup battery lasts how long?
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30-45 min
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What happens when you lose electrical power?
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Lose monitors but retain flowmeter and vaporizer control
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What happens when the battery is depleted?
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Lost N2O and vaporizers on newer machines
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What is considered the high vs intermediate vs low pressure circuits?
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High: gas inlet to pressure regulator
Intermediate: Pressure regulator to flowmeter control valve Low: Flowmeter control valve to common gas outlet |
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O2 supply pressure alarm is triggered by O2 pressure < ____
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30 psig
(if it is <30 psig, regulator opens and allows O2 to escape thru reed whistle) |
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What is the O2 failure safety device?
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Pneumatically operated valve controlled by the pressure in O2 line shuts off or proportionally reduces N2O in O2 pressure falls
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How does the Ohmeda fail-safe valve work?
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Pressure sensor shut-off valve:
If O2 is <20-35 psi, N2O and other gases are CUT OFF "All or nothing" |
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How does the Drager fail-safe valve work?
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O2 supply pressure failure protection device (OFPD):
As O2 pressure falls, OFPD PROPORTIONALLY reduces N2O pressure. All other gases are cute off with O2 <12 psig |
