- Gas specific - Prevents gas mix ups - Two holes on cylinder valve - Fit two pins on yoke - Pin positions are different

Medical Gas Flashcards by Jordan Somers

Who defines a medical compressed gas?

The Interstate Commerce Commission (ICC)

How well did you know this?

Not at all

Perfectly

Who regulates most of the aspects of medical gas?

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

How well did you know this?

Not at all

Perfectly

What does the U.S. Pharmacopeia regulate?

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

How well did you know this?

Not at all

Perfectly

What does the ICC regulate?

The labeling standards

How well did you know this?

Not at all

Perfectly

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

Standards for location, construction, and installation

How well did you know this?

Not at all

Perfectly

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

Develops standards for safe practice of compressed gas

How well did you know this?

Not at all

Perfectly

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

Standards for performance, safety, and pressure valves

How well did you know this?

Not at all

Perfectly

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

1) Titanium
2) Carbon fiber
3) Plastic

How well did you know this?

Not at all

Perfectly

Why are titanium or aluminum containers used instead of steel?

Used instead of steel because steel is not MRI compliant

How well did you know this?

Not at all

Perfectly

What is the body of the medical gas container?

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

How well did you know this?

Not at all

Perfectly

What is the valve of the medical gas container?

Bronze, brass, attached to neck of tank

How well did you know this?

Not at all

Perfectly

What is the port of the medical gas container?

Point of exit for gas

How well did you know this?

Not at all

Perfectly

What is the stem of the medical gas container?

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

How well did you know this?

Not at all

Perfectly

What is the conical depression of the medical gas container?

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

How well did you know this?

Not at all

Perfectly

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

Vents the cylinder under high pressure (by conical depression)

How well did you know this?

Not at all

Perfectly

What is the PISS of the medical gas container?

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

How well did you know this?

Not at all

Perfectly

What is the PISS?

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

How well did you know this?

Not at all

Perfectly

What is the pin position of O2?

2,5
(O2 = 2,5)

How well did you know this?

Not at all

Perfectly

What is the pin position of N2O?

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

How well did you know this?

Not at all

Perfectly

What is the pin position of air?

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

How well did you know this?

Not at all

Perfectly

What is the pin position of CO2?

2,6
(CO2, so 2,6)

How well did you know this?

Not at all

Perfectly

What is an E-tank?

Most common, fits anesthesia machine

How well did you know this?

Not at all

Perfectly

What is the weight of an E-tank?

14 pounds

How well did you know this?

Not at all

Perfectly

What are the dimension of an E-tank?

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

How well did you know this?

Not at all

Perfectly

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

Varies by gas contained

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

1900 psig = 660 litrs

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

745 psig = 1590 liters

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

1900 psig = 625 liters

Are e-tank contents flammable?

Non-flammable but supports combustion

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

Yes

What is a critical temperature?

Temperature above which no amount of pressure can liquefy a gas

What is the critical temperature for N2O?

36.5 degrees C

When does a frost line form?

When > 4 L/min is removed

How do you measure an E-tank N2O content?

- Amount determined by measuring tank weight not gauge pressure - Subtract weight of empty tank from weight of tank

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

0.55 liters

Pressure below 745 = ____ liters or less

250 liters

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

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

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

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

Are markings permanently stamped on cylinder?

Yes

What does the DOT # tell you?

The type of material in cylinder

What is the service pressure in psig?

Max pressure the cylinder may be filled

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

Yes

What is a plus sign on a container?

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

What does the star indicate on the container?

That testing can be every 10 years

Is a label required on all cylinders?

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

Where is the label on the container?

On the shoulder

What does the label on the container do?

Indicates the contained gas

What does the triangle on the container indicate?

Hazard class of gas

What color is the label for oxidizer gas?

Yellow

What color is the label for flammable gas?

Red

What color is the label for non-flammable gas?

Green

How often are containers tested?

At least every 5 years

What is the exception to container rule testing?

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

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

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

What is the service pressure of a container?

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

What color is the oxygen cylinder in the US?

Green (white internationally)

What color is the CO2 cylinder?

Gray

What color is the nitrous cylinder?

Blue

What color is the air cylinder?

Yellow

What color is the helium cylinder?

Black

Where should the tanks be stored?

- 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

What are some cylinder safety concerns?

- 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.

How should you identify a gas cylinder?

By label! Not color!

Are pipeline hose colors usually the same as tank colors?

Yes

What do you want the pipeline gas pressure to be?

50-55

Wall terminal units use what to connect?

Quick couplers (spring loaded, goes to wall)

Pipeline hoses attach to anesthesia machine uses what safety system?

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

What is the central supply for pipeline gases?

- Bulk supply system usually liquid - Two tank banks for small facilities - Tank banks to back up bulk supply

Where is the piping on the gases?

- Piping extends to various locations - Terminal units - Hoses from terminal units to anesthesia machine or other equipment

What are some concerns with pipeline gas?

- 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

What are some hazards of medical gas?

- Fires - Incorrect contents - Damaged or inoperable valve - Explosion - Contaminated contents - High pressure release

What happens if there is an oxygen pipeline failure?

- 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

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

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

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

12 mmHg (pressure gauge guides pressure regulation)