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Principles I > Medical Gas > Flashcards

Medical Gas Flashcards

1
Q

Who defines a medical compressed gas?

A

The Interstate Commerce Commission (ICC)

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2
Q

Who regulates most of the aspects of medical gas?

A

The Department of Transportation (DOT)
(In charge of design, construction, testing, marketing, labeling, filing, storage, handling, maintenance, and transportation of compressed gas cylinders)

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3
Q

What does the U.S. Pharmacopeia regulate?

A

The purity standard and specs (don’t want impure gas)

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4
Q

What does the ICC regulate?

A

The labeling standards

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5
Q

What does the National Fire Prevention Association (NFPA) regulate?

A

Standards for location, construction, and installation

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6
Q

What does the Compressed Gas Assoc. (CGA) regulate?

A

Develops standards for safe practice of compressed gas

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7
Q

What does the American National Standards Institute (ANSI) regulate?

A

Standards for performance, safety, and pressure valves

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8
Q

There are a variety of materials used as containers. What are the 3 biggest ones?

A

1) Titanium
2) Carbon fiber
3) Plastic

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9
Q

Why are titanium or aluminum containers used instead of steel?

A

Used instead of steel because steel is not MRI compliant

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10
Q

What is the body of the medical gas container?

A

Steel, aluminum alloy, flat on bottom, tapered neck at top, 3/8 inch thick

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11
Q

What is the valve of the medical gas container?

A

Bronze, brass, attached to neck of tank

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12
Q

What is the port of the medical gas container?

A

Point of exit for gas

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13
Q

What is the stem of the medical gas container?

A

Moves up (opens) or down (closes) (on top of valve)

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14
Q

What is the conical depression of the medical gas container?

A

Fits the retaining screw of the yoke (yoke hits & tightens it)

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15
Q

What is the pressure relief valve of the medical gas container?

A

Vents the cylinder under high pressure (by conical depression)

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16
Q

What is the PISS of the medical gas container?

A

Pin index safety system; different location of pins for each gas

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17
Q

What is the PISS?

A
  • Gas specific
  • Prevents gas mix ups
  • Two holes on cylinder valve
  • Fit two pins on yoke
  • Pin positions are different
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18
Q

What is the pin position of O2?

A

2,5
(O2 = 2,5)

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19
Q

What is the pin position of N2O?

A

3,5
(N2O = 2 + 1 = 3, so 3,5)

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20
Q

What is the pin position of air?

A

1,5
(air = 1, so 1,5)

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21
Q

What is the pin position of CO2?

A

2,6
(CO2, so 2,6)

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22
Q

What is an E-tank?

A

Most common, fits anesthesia machine

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23
Q

What is the weight of an E-tank?

A

14 pounds

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24
Q

What are the dimension of an E-tank?

A

4 1/2 inches O.D. by 26 in. length

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25
Q

What is the pressure & volume of an E-tank?

A

Varies by gas contained

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26
Q

What is the E-tank content and pressure of oxygen?

A

1900 psig = 660 litrs

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27
Q

What is the E-tank content and pressure of nitrous oxide?

A

745 psig = 1590 liters

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28
Q

What is the E-tank content and pressure of air?

A

1900 psig = 625 liters

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29
Q

Are e-tank contents flammable?

A

Non-flammable but supports combustion

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30
Q

Are e-tank contents stores as liquid in cylinder at room temp?

A

Yes

31
Q

What is a critical temperature?

A

Temperature above which no amount of pressure can liquefy a gas

32
Q

What is the critical temperature for N2O?

A

36.5 degrees C

33
Q

When does a frost line form?

A

When > 4 L/min is removed

34
Q

How do you measure an E-tank N2O content?

A
  • Amount determined by measuring tank weight not gauge pressure
  • Subtract weight of empty tank from weight of tank
35
Q

1 gram N2O = ___ liters of N2O at 20 degrees C

A

0.55 liters

36
Q

Pressure below 745 = ____ liters or less

A

250 liters

37
Q

Calculating N2O content:
Gauge reading is 745 psig. Tank weight 17 pounds. How many liters are in the tank?

A

17 pounds - 14 pounds = 3 pounds
3 lbs/2.2 = 1.36 kg (conversion from lbs to kg)
1.36 kg = 1360 grams
1360 grams x 0.55 liters/gram = 748 liters

38
Q

Calculating O2 content: Taking a vent dependent patient from ICU to the OR ambu bagging with 10 liters of O2 flow/minute. How long will the O2 last? Gauge reading 1200 psi

A

1200/1900 (full) = 0.63 (63% left)
660 liters x 0.63 = 415 liters
415 liters/ 10 L/min = 41 minutes

39
Q

Are markings permanently stamped on cylinder?

A

Yes

40
Q

What does the DOT # tell you?

A

The type of material in cylinder

41
Q

What is the service pressure in psig?

A

Max pressure the cylinder may be filled

42
Q

Does the container also have the manufacturer and serial number on it?

A

Yes

43
Q

What is a plus sign on a container?

A

Cylinder can be charged up to 10% in excess of service pressure

44
Q

What does the star indicate on the container?

A

That testing can be every 10 years

45
Q

Is a label required on all cylinders?

A

Yes; it is the best way to identify gas in cylinder!!!

46
Q

Where is the label on the container?

A

On the shoulder

47
Q

What does the label on the container do?

A

Indicates the contained gas

48
Q

What does the triangle on the container indicate?

A

Hazard class of gas

49
Q

What color is the label for oxidizer gas?

A

Yellow

50
Q

What color is the label for flammable gas?

A

Red

51
Q

What color is the label for non-flammable gas?

A

Green

52
Q

How often are containers tested?

A

At least every 5 years

53
Q

What is the exception to container rule testing?

A

If there is a star stamp, there is a special permit that lets it be tested every 10 years

54
Q

Should the test date (month/year) be on the cylinder?

A

Yes, it is required to be permanently stamped on the cylinder

55
Q

What is the service pressure of a container?

A

The max pressure may be filled
(tested to a minimum 1.6 x service pressure)

56
Q

What color is the oxygen cylinder in the US?

A

Green (white internationally)

57
Q

What color is the CO2 cylinder?

A

Gray

58
Q

What color is the nitrous cylinder?

A

Blue

59
Q

What color is the air cylinder?

A

Yellow

60
Q

What color is the helium cylinder?

A

Black

61
Q

Where should the tanks be stored?

A
  • In a designated tank storage area
  • Cool, clean, dry area, free from moisture
  • Not near flame, spark, heat sources
  • Out of direct sunlight
  • Store upright in rack preferred
  • No free standing cylinders
  • Lay on side if no rack available
62
Q

What are some cylinder safety concerns?

A
  • No grease, oils, rubber lube, etc.
  • Keep connections tight
  • Keep valve in closed position to prevent leak
  • No free stand, secure upright, or rack/basket
  • If no alternative, then lay on side
  • Don’t polish, clean with solvents, etc.
63
Q

How should you identify a gas cylinder?

A

By label! Not color!

64
Q

Are pipeline hose colors usually the same as tank colors?

A

Yes

65
Q

What do you want the pipeline gas pressure to be?

A

50-55

66
Q

Wall terminal units use what to connect?

A

Quick couplers (spring loaded, goes to wall)

67
Q

Pipeline hoses attach to anesthesia machine uses what safety system?

A

DISS (hose going to machine is always DISS, not quick couplers)

68
Q

What is the central supply for pipeline gases?

A
  • Bulk supply system usually liquid
  • Two tank banks for small facilities
  • Tank banks to back up bulk supply
69
Q

Where is the piping on the gases?

A
  • Piping extends to various locations
  • Terminal units
  • Hoses from terminal units to anesthesia machine or other equipment
70
Q

What are some concerns with pipeline gas?

A
  • Hoseline disconnect (hanging from ceiling; pulled from wall)
  • Particulate material contaminating line
  • Quick couplers are easier to disconnect
  • Hoses across floor can become occluded from heavy equipment rolling over hose
71
Q

What are some hazards of medical gas?

A
  • Fires
  • Incorrect contents
  • Damaged or inoperable valve
  • Explosion
  • Contaminated contents
  • High pressure release
72
Q

What happens if there is an oxygen pipeline failure?

A
  • Oxygen low pressure alarm sounds
  • Delivery of other gases is stopped
  • New machines switch to air to drive bellows
  • If pipeline failure then disconnect pipeline to allow O2 cylinder to begin flowing to machine
    - Cylinder pressure is intentionally lower distal to regulator (45 kpg) than pipeline
    (50 kpg)
    - This is because if cylinder & pipeline are both left open then flow comes from
    pipeline
73
Q

In the medical suction/vacuum, what is the pipeline conection?

A

It is a quick coupler and DISS
(suction pump pulls into wall)

74
Q

What is the minimum negative pressure of the suction/vacuum?

A

12 mmHg (pressure gauge guides pressure regulation)

Principles I (4 decks)

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