3) Gases & Piping Systems

what % of air is nitrogen?

78

what % of air is oxygen?

21

what is nitric oxide used for?

severe pulmonary hypertension

what does oxygen do?

maintain blood oxygen and pneumatic power

why is nitrous oxide fast to act?

low solubility

what % of nitrous is fatal?

85

why is air used?

decreases FiO2

what gas aids delivery of O2 to patients with significant upper airway obstruction and why?

helium because extremely low density and thus low resistance to flow

what gas plays a part in cerebral vasodilation?

CO2

tank color for nitrogen?

black

tank color for CO2?

grey

tank color for helium?

brown

tank color for heliox?

brown/green

what’s the psig of a full e-cylinder of nitrous oxide until it reaches about 25% remaining?

745

what’s the volume of a full nitrous oxide e-cylinder?

1600L

what’s the weight of a full e-cylinder of oxygen?

6.76kg

what’s the weight of a full e-cylinder of nitrous oxide?

8.8kg

density of air?

1.2

density of helium?

0.1657

density of oxygen?

1.326

what is the only gas that doesn’t have a pipeline pressure of ~50 psig?

nitrogen (150-200 psig)

the e-cylinders are the primary gas source for which gases?

heliox, CO2

what are the 3 concentrations of helium?

100%, 20% O2 with helium, 25% O2 with helium

what gas is created by special hospital compressors with quarterly quality monitoring?

air

what is the Ohio Quick Connect System (OQC)?

a way for the hoses to click into pipeline

what 6 functions does oxygen do in the machine?

• pneumatic power

• auxiliary

• oxygen flush

• pressurizes O2 supply pressure failure alarm

• O2 flow meter

• pressurizes fail-safe valve

in addition to triggering electrical power, what’s the purpose of the master switch?

pneumatic pressure gateway that allows O2 and air to travel from high to low pressure system

minimum O2 flow rate?

50-200mL/min

which machine brand has the oxygen failure protection device (OFPD)?

Drager (gradual)

which machine brand has the pressure sensor shut-off valve?

GE Datex Ohmeda

at what pressure would the pressure relief valves open and vent to the room at the gas supply module?

75 psig

at what pressure would the pressure relief valves open and vent to the room at the common gas outlet?

5.5 psig

flow rate of O2 flush

35-75 L/min

how does alternate O2 control deliver O2?

independent pneumatic pathway

why is there an alternate O2 control?

backup if power fails and electronic mixer shuts down

in addition to delivering O2, what else does the alternate O2 control do?

terminate all other gases

how many times/sec does an electronic gas mixer check flow?

200 times/sec

how fast can an electric gas mixer respond to changes in flow?

500 ms

what calculates the flow rate in an electronic gas mixer?

hot wire anemometer and pressure transducer

what happens if the hot wire anemometer and pressure transducer in the electronic gas mixer have a discrepancy?

alternate O2 automatically enabled

what machines have a link 25 system?

GE Datex Ohmeda