Medical Gas Systems Exam Questions
with All Correct Answers
What are the three cylinder safety systems? - Answer-1. Color coding
2. Pin index safety system-for smaller cylinders
3. Valve outlet connection- for larger cylinders
The PISS includes what cylinders? - Answer-cylinders A(small)-E(medium)
What is the safety system for large cylinders? - Answer-- they have a threaded outlet
(bull nose) connection.
Where must the color safety system be located on the cylinder?
What if it is more that one gas? - Answer--Must be located at the top.
-must have the two colors of each on the top of the cylinder
What the colors for all the types of gas?
oxygen
N2o
air
heliox
Co2 - Answer-green
blue
yellow
brown/green
grey
How much does an E-cyclinder weigh? - Answer-14lbs
What is the capacity of a N2o E cylinder?
pounds
liters psig - Answer-6.4 lbs
1590L
745psig
What is the capacity of o2 E cylinder? - Answer-1.9 lbs
660 L
1900psig
How do you calculate a your "E" cylinder number of liters?
, How would you calculate how much time is left? - Answer--You would multiple gauge
pressure by 0.3= number of liters in tank
-You would divide liters by flow rate to find minutes left
ex. 300 psig x 0.3= 90L gas/ 2L/min= 45 min
What happens to the pressure in a non liquefied gas cylinder? - Answer--the pressure in
the cylinder will decrease as you withdraw the oxygen
ex)o2
What happens in the liquefied gas cylinder as the contents decrease? - Answer-- b/c
pressure depends on the vapor pressure of the gas it will read a constant 745 psig until
empty
-will decrease rapidly once empty
How do you determine how much is in the tank of a liquefied gas cylinder? - Answer--
weigh it empty E cylinder= 14lbs
How often do the cylinders need to be tested?
Where will it be located? - Answer-- every 5 yrs unless special permit
- 10 yrs with a special permit
- It will be permanently be stamped on the cylinder
Who regulates filling the cylinders? - Answer-The DOT.
What is the service pressure? - Answer-the pressure filled cylinder @ 70(f) may not
exceed the service pressure marked on the cylinder except for some non-liquefed, non-
flammable gas which can have an extra 10%.
A gas @ a safe pressure can become unsafe @ a high temp according to who's law? -
Answer-- gay-lussac law
Valves and regulators should never come in contact with what? Why - Answer-oil,
grease, rubber, b/c oils + 02/n2o = explosion
What are the two types of gas supplies? - Answer-1. Gas cylinders (emergency or
mobile)
2. Central pipeline system (primary)
Cylinders contain gas in what form? - Answer--Compressed (gas or liquid form)
PSIG= - Answer--pounds per square inch gauge
-measured pressure - atm pressure = psig
PSIA (absolute)= - Answer--pounds per square inch absolute
with All Correct Answers
What are the three cylinder safety systems? - Answer-1. Color coding
2. Pin index safety system-for smaller cylinders
3. Valve outlet connection- for larger cylinders
The PISS includes what cylinders? - Answer-cylinders A(small)-E(medium)
What is the safety system for large cylinders? - Answer-- they have a threaded outlet
(bull nose) connection.
Where must the color safety system be located on the cylinder?
What if it is more that one gas? - Answer--Must be located at the top.
-must have the two colors of each on the top of the cylinder
What the colors for all the types of gas?
oxygen
N2o
air
heliox
Co2 - Answer-green
blue
yellow
brown/green
grey
How much does an E-cyclinder weigh? - Answer-14lbs
What is the capacity of a N2o E cylinder?
pounds
liters psig - Answer-6.4 lbs
1590L
745psig
What is the capacity of o2 E cylinder? - Answer-1.9 lbs
660 L
1900psig
How do you calculate a your "E" cylinder number of liters?
, How would you calculate how much time is left? - Answer--You would multiple gauge
pressure by 0.3= number of liters in tank
-You would divide liters by flow rate to find minutes left
ex. 300 psig x 0.3= 90L gas/ 2L/min= 45 min
What happens to the pressure in a non liquefied gas cylinder? - Answer--the pressure in
the cylinder will decrease as you withdraw the oxygen
ex)o2
What happens in the liquefied gas cylinder as the contents decrease? - Answer-- b/c
pressure depends on the vapor pressure of the gas it will read a constant 745 psig until
empty
-will decrease rapidly once empty
How do you determine how much is in the tank of a liquefied gas cylinder? - Answer--
weigh it empty E cylinder= 14lbs
How often do the cylinders need to be tested?
Where will it be located? - Answer-- every 5 yrs unless special permit
- 10 yrs with a special permit
- It will be permanently be stamped on the cylinder
Who regulates filling the cylinders? - Answer-The DOT.
What is the service pressure? - Answer-the pressure filled cylinder @ 70(f) may not
exceed the service pressure marked on the cylinder except for some non-liquefed, non-
flammable gas which can have an extra 10%.
A gas @ a safe pressure can become unsafe @ a high temp according to who's law? -
Answer-- gay-lussac law
Valves and regulators should never come in contact with what? Why - Answer-oil,
grease, rubber, b/c oils + 02/n2o = explosion
What are the two types of gas supplies? - Answer-1. Gas cylinders (emergency or
mobile)
2. Central pipeline system (primary)
Cylinders contain gas in what form? - Answer--Compressed (gas or liquid form)
PSIG= - Answer--pounds per square inch gauge
-measured pressure - atm pressure = psig
PSIA (absolute)= - Answer--pounds per square inch absolute
