Gas Supply & Distribution Flashcards Preview

Machine Final > Gas Supply & Distribution > Flashcards

Flashcards in Gas Supply & Distribution Deck (44):
1

What is PSIg pressure measured against?

atmospheric pressure

2

What is PSIa pressure measured agains?

pressure in a vacuum

3

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

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

4

What is the tank pressure at absolute 0?

14.7 PSIa

5

Which organization enforces standards for purity of medical gas?

FDA

6

What is molecular weights for:
O2
N2 (nitrogen)

O2 = 32
N2 = 28

7

Cylinders are primary source for which gases?

1. Helium
2. Heliox
3. CO2

8

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

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

9

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

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

10

PISS is only used on what size cylinders?

A-E

11

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

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.

12

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

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.

13

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

H = 6900 L
E = 660 L

14

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

H= 15,800 L
E= 1590 L

15

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

N2O
CO2

16

What are the US color codes for elements?

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

17

What are the international color codes for elements?

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

18

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

pressure relief valve

19

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

75 psi(g)

20

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

False. gas DOES flow to breathing circuit

21

What is the empty weight of E cylinder?

14 kg

22

what is the empty weight of H cylinder?

119 kg

23

What is the capacity and pressure of O2 E cylinder?

660 L
2200 psi(g)

24

What is the capacity and pressure of O2 H cylinder?

6900 L
2200 psi(g)

25

What is the capacity and pressure of air E cylinder?

625 L
1900 psi(g)

26

What is the capacity and pressure of O2 H cylinder?

6550 L
2200 psi(g)

27

What is the capacity and pressure of N20 E cylinder?

1590 L
745 psi(g)

28

What is the capacity and pressure of N20 H cylinder?

15800 L
745 psi(g)

29

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

directly proportional

30

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

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

31

How do you calculate amount in tank?

P1V1 = P2V2

32

How do you calculate Total O2 consumption?

Total O2 consump.= fresh gas flow + minute ventilation

33

How do you calculate time remaining?

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

34

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

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

35

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

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

36

What is pipeline pressure?

50 psi(g)

37

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

863 L

38

How is pipeline N2O supplied?

Banks of G or H cylinders

39

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

diamter index safety system (DISS)
fitting for each gas has different diameter

40

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

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

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?

shut off valves (manual and service)

42

which type of shut off valve are in locked cases?

Service shutoff valve

43

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

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

44

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

Master alarm