Gas Cylinders Flashcards

1
Q

Compressed Gas (nonliquified) Defined

A

Remains gas at ordinary temp & pressure, at very low temp becomes “cryogenic liquid”

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2
Q

Examples of nonliquified gas

A

Oxygen, nitrogen, helium, air

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3
Q

Compressed Gas (liquified) Defined

A

Becomes liquid in a container at ordinary temp & pressure

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4
Q

Examples of liquified gas

A

Carbon dioxide, nitrous oxide

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5
Q

Non flammable gas definition

A

will not burn, supports combustion or explode - some can extinguish flames

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6
Q

Combustion supporting gas definition

A

Increases rate/intensity of anything thats burning/could burn. Minimum of 15 feet from flame

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7
Q

Flammable gas definition

A

can be readily ignited, explosive in the presence of oxygen

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8
Q

What would you do with a fire in the airway?

A

Turn off oxygen and pull ETT quickly

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9
Q

Air - color code, price, compressed?

A

Yellow, usually free & readily available, can be compressed from the atmosphere, may also be synthetically produced

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10
Q

Helium - color code & characteristics

A

Brown, chemically inert, lighter than air, colorless, odorless, nonflammable, will not support life

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11
Q

Oxygen - color code, characteristics

A

Green, colorless, odorless, tasteless, supports life, non-flammable, supports combustion, liquid at -300 F, produces oxides in combinations

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12
Q

HeliOx - what it is

A

Helium/Oxygen mixture, usually 20-40% O2. Reduces airway resistance, most commonly used because it reduces airway fires during laser surgery

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13
Q

Nitrous Oxide - color code, characteristics

A

Blue, 75-80% in liquid form (at room temperature is a liquid at 747 psig). Will not get low reading until all liquid is gone

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14
Q

A full E cylinder contains how much nitrous oxide?

A

1590 L

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15
Q

Carbon Dioxide - color code, characteristics

A

Grey, colorless, odorless, acidic taste, will not support life, non-flammable/does not burn,

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16
Q

How much carbon dioxide comes in and goes out per minute normally?

A

250 in, 200 out per minute, some of it is metabolized

17
Q

Most common gas cylinder in health care?

A

E cylinder

18
Q

How much oxygen does an E cylinder hold?

A

660 L at 1900 psig

19
Q

How much oxygen does a H cylinder hold?

A

6900 L at 2200 psig

20
Q

What color code is nitrogen

21
Q

What does psig mean?

A

pounds per square inch gauge, difference between measured pressure & surrounding atmosphere.

22
Q

Calculating cylinder gas volume (equation)

A

Duration of gas flow in minutes =
gauge pressure (PSI) x cylinder conversion factor (0.28)
——————————————-
gas flow (L/min)

23
Q

If you have 1200 psi and gas flow is running at 4 L/min, how long do can you run on that tank?

A

84 minutes

24
Q

What is the pin index safety system?

A

PISS - each gas has it’s own unique PIN position so the wrong cylinder should not be able to be mounted

25
Cylinder safety
Only handled by trained personnel, no oil/grease/lubricants on valves/regulators/gauges or fittings, Temp -7 C to 54 C, tight connections, do not obstruct pressure relief device, do not cross use regulators/hoses, do not use reducer adapters, keep valves closed when not in use, ID cylinder, remove cover, check for washer, PISS, open slowly, check reading
26
Central oxygen contains how much?
7.3 million L O2
27
NFPA requirements for liquid oxygen supply
25-50 ft from hospital or flammable gas/gas storage or wooden structure, on asphalt/concrete, fenced, posted no smoking/open flame
28
What is diameter index safety system?
DISS - prevents pipeline from wall being connected to the wrong inlet on the machine
29
What does the US Department of Transportation do for gas cylinders?
Regulates construction & handling of all medical compressed gas cylinders (design, construction, testing, marking, labeling, filling, storage, handling, maintenance, transportation), requires periodic visual inspection, inspecting cylinders every 5 years for dents, gouges, arc burns, & physical stress. Also transportation of gas cylinders
30
How to test cylinders
Hydrostatic test checks for leaks, cylinder expansion & wall stress -- cylinder is filled with water and then submerged in water, it is then pressurized to 3000 psig which will cause slight expansion - should return to original size when pressure is released with no change in water level measurement.
31
How does a cylinder fail a test?
If it displaces more water after than before pressurization, it has residual expansion-- if it's s original size can use it for 5 years, if more than 10% it will be removed from medical use