Medical Gases

Question 1

What two locations are medical gases stored?

Answer 1

metal cylinders or

reservoirs of bulk gas storage and supply systems

Question 2

____ are sometimes the only source of medical gas for anesthesia machines in OOOR settings.

Answer 2

e-cylinders

Question 3

If an anesthetic is being administered with only e-cylinders what safety consideration must be made?

Answer 3

BOTH the anesthesia provider adn related support personell must first ensure an adequate supply of reserve cylinders are avaliable

Question 4

When using e-cylinders only when must you replace the cylinder?

Answer 4

before it is completely empty

Question 5

E-cylinders of O2 are filled to what psig?

Answer 5

1900

Question 6

What is the fix mass of a gas?

Answer 6

When cylinders are full, the cylinder contains a fixed number of gas molecules

Question 7

What is Boyles law?

Answer 7

Pressure x Volume equals a constant rate as long as temp doesnt change
(P1V1 = P2V2)

Question 8

1 atmosphere = ___ mmHg

Answer 8

760

Question 9

What indicates an O2 e-cylinder is 1/2 empty?

Answer 9

1000 psig

Question 10

When a tank of O2 is 50% full, how many liters does it contain?

Answer 10

330 L

Question 11

B/c O2 exists only as a gas at room temp, the tank’s _____ can be used to determine how much gas remains in the e-cylinder.

Answer 11

pressure gauge

Question 12

What is the tank volume in a full O2 tank?

Answer 12

660 L

Question 13

How much should be in an O2 tank to transport?

Answer 13

At least 50%

Question 14

How many L does a full e-cylinder of N2) have?

Answer 14

1590 L

Question 15

As long as some liquid Nitrous Oxide ramins in the tank and the temperature remains constnat, the pressure in the tank will be ___ psi.

Answer 15

745

Question 16

A full e-cylinder of N2O used at 3L/min will last ___ hours.

Answer 16

9 hours

Question 17

How do you determine how much is left in an N2O tank?

Answer 17

weigh it

Question 18

What color is the e-cylinder for medical air?

Answer 18

yellow

Question 19

What is the full cylinder pressure of medical air?

Answer 19

1900 psig

Question 20

How many liters does a tank of medical air contain when full?

Answer 20

625 L

Question 21

What color is O2 tank?

Answer 21

green

Question 22

What color is CO2 tank?

Answer 22

gray

Question 23

What color is N2O tank?

Answer 23

blue

Question 24

What color is helium tank?

Answer 24

brown

Question 25

Who regulates the shipping of and marking of medical gas cylinders?

Answer 25

US department of transportation (DOT)

Question 26

The ____ is stamped on each e-cylinder and should never be exceeded.

Answer 26

service pressure

Question 27

What safety feautres prevent e-cylindres from exploding?

Answer 27

Fusible plug Frangible disk assembly Safety relief valve

Question 28

What is the fusible pulg?

Answer 28

made of metal alloy w/ a low melting point, will melt in a fire and allow gas to escapre on e-cylinders

Question 29

What is a frangible disk assembly?

Answer 29

E-cylinders contain a metal disk designed to break when a certain pressure is exceeded and tehreby allow gas to escape through a d/c vent

Question 30

What is a safety relief valve?

Answer 30

A spring-loaded mechanism on e-cylinders that closes a d/c vent

Question 31

What letter indicates a small cylinder?

Answer 31

E

Question 32

What letter indicates a large cylinder?

Answer 32

H

Question 33

What is the funciton of regulators that attach to valve ports of cylindres?

Answer 33

reduce and control teh pressure of the gas

Question 34

The connection between cylinder and yoke is made gas specific by the ____ for small cylinder connections.

Answer 34

pin index safety system (PISS)

Question 35

What PISS system relies on _____ on the cylinder yoke connector just below the fitting for the valve outlet port.

Answer 35

two 5 mm stainless steel pins

Question 36

PISS: How many different pin positions are avaliable depending on the type of gas in the cylinder?

Answer 36

7

Question 37

What is the pin position for O2?

Answer 37

2-5

Question 38

If a gas cylinder cannot be secured what should you do?

Answer 38

lay on its side

Question 39

How do you store small cylinders?

Answer 39

in nonflammable racks

Question 40

How do you store large cylinders?

Answer 40

chained to a wall

Question 41

What indicates a leak in a cylinder when opened?

Answer 41

hissing noise

Question 42

What are the 3 components of medical gas pipeline?

Answer 42

central gas supply pipelines to transport connectors

Question 43

In central supply systems, pressure relief valves are designed to open if pressure in teh system exceeds ____.

Answer 43

the normal level by 50%

Question 44

Will you be notified if a reserve supply of O2 has been accessed d/t low supply in main storage vessel?

Answer 44

Yes, alarm system is used

Question 45

Pressure alarms built into the main gas supply line sound when the line pressure varies by ______.

Answer 45

20% in either direction from the normal (normal = 55)

Question 46

What is the normal operating pressure of main supply line?

Answer 46

@ 55 psig

Question 47

If an O2 concentrator is used, O2 concentration ______.

Answer 47

may vary w/ gas flow

Question 48

O2 concentrators are most effective at delivering O2 at what flow?

Answer 48

<4L/min

Question 49

What is the Heliox mixture?

Answer 49

He/O2 | 3:1

Question 50

Why is a Heliox mixture supplied premixed on some newer anesthesia machines?

Answer 50

To prevent the risk of hypoxia that occurs when 100% Helium tanks are used

Question 51

What type of prodcut is Nitric Oxide classifed as?

Answer 51

pharmaceutical product (not medical gas)

Question 52

Larger ORs must have enough suction to remove ______ of air.

Answer 52

99L/minute

Question 53

Normal wall vacuum = ___ psig.

Answer 53

-7

Question 54

How many vacuum pumps must be present in OR?

Answer 54

2 independt pumps, capable of handling peak laod alone

Question 55

If one vacuum pump fails, what happens?

Answer 55

Automatically switches to other

Question 56

Central vacuum's system piping must not be exposed to ______ to prevent ____.

Answer 56

low temperatures condensation

Question 57

What is a noninterchangeable thread system for medical gas pipelines?

Answer 57

DISS