Gas Supply & Distribution

Question 1

What is PSIg pressure measured against?

Answer 1

atmospheric pressure

Question 2

What is PSIa pressure measured agains?

Answer 2

pressure in a vacuum

Question 3

True or False. When the PSIg of a tank reads 0, the tank is completely empty.

Answer 3

False

pressure in tank is same as pressure outside of tank, so no gas will flow

Question 4

What is the tank pressure at absolute 0?

Answer 4

14.7 PSIa

Question 5

Which organization enforces standards for purity of medical gas?

Answer 5

FDA

Question 6

What is molecular weights for:
O2
N2 (nitrogen)

Answer 6

O2 = 32
N2 = 28

Question 7

Cylinders are primary source for which gases?

Answer 7

1. Helium
2. Heliox
3. CO2

Question 8

what is the path of flow for gas from a cylinder?

Answer 8

yoke > inlet filter > pressure gauge > check valve > high pressure requlator

Question 9

What is the purpose of the Pin Index Safety System (PISS)?

Answer 9

a safety feature to help ensure that cylinders are not installed on the wrong cylinder yoke. Each particular gas’s cylinder valve has an assigned hole configuration and the cylinder yoke has an assigned pin configuration

Question 10

PISS is only used on what size cylinders?

Answer 10

A-E

Question 11

On large cylinder connections what does the follow number example represent?
0.903-14-RH EXT

Answer 11

The first number is the diameter in inches of the cylinder outlet.
The next number gives the number of threads per inch.
The letters following this indicate whether the threads are right hand or left hand & external or internal.

Question 12

What is the purpose of a cylinder (primary) regulator?

Answer 12

lower the high gas pressure as it exits a cylinder & enters the system. Often called Primary Regulators because they are the first regulator the gas encounters when flowing through the machine.

Question 13

How many liters of 02 in an H cylinder? E cylinder?

Answer 13

H = 6900 L
E = 660 L

Question 14

How many liters of N2O in an H cylinder? E cylinder?

Answer 14

H= 15,800 L
E= 1590 L

Question 15

Which elements are in both a gas/liquid phase in the tank?

Answer 15

N2O

CO2

Question 16

What are the US color codes for elements?

Answer 16

02 = green 
air = yellow
N20 = blue
He = brown
Heliox = brown &  green
CO2 = gray
N2 = black

Question 17

What are the international color codes for elements?

Answer 17

same as US, EXCEPT :
O2 = White
air = white & black
heliox = brown & white

Question 18

If the pressure in the gas supply module is to high, what allows the pressure to be released to atmosphere?

Answer 18

pressure relief valve

Question 19

At what pressure will the pressure relief valve open to vent the gas to atmosphere?

Answer 19

75 psi(g)

Question 20

True or false. When the pressure relief valve is open, gas DOES NOT flow to the breathing circuit (as long as sufficient supplies)?

Answer 20

False. gas DOES flow to breathing circuit

Question 21

What is the empty weight of E cylinder?

Answer 21

14 kg

Question 22

what is the empty weight of H cylinder?

Answer 22

119 kg

Question 23

What is the capacity and pressure of O2 E cylinder?

Answer 23

660 L
2200 psi(g)

Question 24

What is the capacity and pressure of O2 H cylinder?

Answer 24

6900 L
2200 psi(g)

Question 25

What is the capacity and pressure of air E cylinder?

Answer 25

625 L
1900 psi(g)

Question 26

What is the capacity and pressure of O2 H cylinder?

Answer 26

6550 L
2200 psi(g)

Question 27

What is the capacity and pressure of N20 E cylinder?

Answer 27

1590 L
745 psi(g)

Question 28

What is the capacity and pressure of N20 H cylinder?

Answer 28

15800 L
745 psi(g)

Question 29

how is fullness related to pressure in O2, heliox, and air cylinders?

Answer 29

directly proportional

Question 30

How do you calculate amount of O2 time left in cylinder?

Answer 30

1. how much is left in the tank?
2. calculate Total O2 consumption
3. calculate time remaining

Question 31

How do you calculate amount in tank?

Answer 31

P1V1 = P2V2

Question 32

How do you calculate Total O2 consumption?

Answer 32

Total O2 consump.= fresh gas flow + minute ventilation

Question 33

How do you calculate time remaining?

Answer 33

Time = what’s left in tank / total O2 consump.

Question 34

When is gaseous N20 directly proportional to the pressure in the tank?

Answer 34

when the liquid N20 is gone. will remain at 745 psi(g) until liquid is gone

Question 35

how do you calculate the amount of N20 left in the cylinder?

Answer 35

1. how much does it weighs
2. then subract that weight from tare (empty) weight
3. use M1V1 = M2V2
   (M1 = difference in weight and tare weight)
   (V2 = 1 Mol = 22.4 L)
   (M2 = 44 g) 1 mol of N2O

Question 36

What is pipeline pressure?

Answer 36

50 psi(g)

Question 37

How many liters of O2 gas can you get from 1 L of liquid O2?

Answer 37

863 L

Question 38

How is pipeline N2O supplied?

Answer 38

Banks of G or H cylinders

Question 39

What type of system is used to prevent incorrect connections for the pipeline gas supplies?

Answer 39

diamter index safety system (DISS)

fitting for each gas has different diameter

Question 40

What is advantage/disadvantage of quick connecter as r/t DISS?

Answer 40

advantage = more convenient (don't need tools)
disadvantage=  tend to leak more and are NOT standardized

Question 41

what type of valves allow for specific areas of the piping system to be isolated in the event of a problem as well as for maintenance, repair, testing, or expansion without the whole system being turned OFF?

Answer 41

shut off valves (manual and service)

Question 42

which type of shut off valve are in locked cases?

Answer 42

Service shutoff valve

Question 43

what type of alarm monitors a specific area supplied by gas ?

Answer 43

area (local) alarm (signals at 20% above or below norm. pressure)

Question 44

What alarm would sound if there was a problem with the central supply?

Answer 44

Master alarm