SAFE DISPENSING OF PROPANE
EXAM QUESTIONS & ANSWERS
Name 3 characteristics of propane - Correct Answers -colorless, odorless, tasteless
What is the initial boiling point of propane - Correct Answers --44 degrees
What does one gallon of liquid propane weigh in pounds - Correct Answers -4.2 pounds
How heavy is propane vapor compared to air? Propane liquid to water? - Correct
Answers -1.5 > 1. 1 and 1/2 more than air (SO4 < H20)
What is the limit of flammability in air, percent of vapor in air/gas mixture? - Correct
Answers -2.15%-9.6%
What is the most commonly used odorant in LP gases and why is it added? - Correct
Answers -Ethynl Mercaptan
When liquid propane is released to the atmosphere, what is it's expansion ratio? -
Correct Answers -25%
Is propane non-toxic? - Correct Answers -Yes
Name several potential sources of ignition? - Correct Answers -Fans, switches, car
ignitions, static, cigs.
When the outside temperature increases, what happens to propane inside a container?
- Correct Answers -Increase pressure
Name THREE types of specifications which propane containers are manufactured
under. - Correct Answers -Container info/ filling connections valves/ product storage
area
What does DOT stand for? ASME? FAA? - Correct Answers -Department of
Transportation, American Society of Mech. Engineering, Federal Aviation Admin.
How long after manufacture may a DOT Steel or Aluminum cylinder be used before re-
certification is required? How many re-certifications are allowed? - Correct Answers -12
years, every 5, 7, 12 years (as many as you want).
, How long after manufacture may a DOT Composite cylinder be used before re-
certification is required? - Correct Answers -5 years and every 5 years after 15 year
max
Where is the identification information found on a DOT cylinder? On an ASME tank? -
Correct Answers -DOT: Collar/ Neck Ring/ Body. ASME: Data Plate
If an ASME container does not have a data plate, but appears to be in good condition,
can it be filled? - Correct Answers -NO
Can a licensed dispensing unit operator re-qualify DOT cylinders for continued use? -
Correct Answers -NO
Name 3 types of re-qualification that can determine if a DOT cylinder is acceptable for
safe continued use. - Correct Answers -External visual inspection, proof pressure
method, volumetric expansion method.
The cylinder marking 4BW-240 tells you what? - Correct Answers -4bw- cylinder
specification type
240- cylinder service pressure
How does a back flow check valve work? - Correct Answers -Always close unless fuel
from outside forces open
What is the purpose of a relief valve? - Correct Answers -Release vapor pressure to
atomsphere to maintain pressure inside container
What information does a fixed liquid level gauge give you? - Correct Answers -When the
tank is 80% full
What should a vapor service valve (POL) be equipped with when disconnected? -
Correct Answers -Plug or Cap
What does the excess flow in a liquid service valve do? - Correct Answers -Permits flow
of gas in either direction/ closes when flows too fast
What is an OPD and what is its purpose? - Correct Answers -Overfill prevention device/
prevents overfilling
Can you rely on an OPD valve for accurate filling of a DOT cylinder - Correct Answers -
NO
Is the float gauge alone a suitable method for filling - Correct Answers -NO
What must be done before a new DOT container may be filled - Correct Answers -Purge
EXAM QUESTIONS & ANSWERS
Name 3 characteristics of propane - Correct Answers -colorless, odorless, tasteless
What is the initial boiling point of propane - Correct Answers --44 degrees
What does one gallon of liquid propane weigh in pounds - Correct Answers -4.2 pounds
How heavy is propane vapor compared to air? Propane liquid to water? - Correct
Answers -1.5 > 1. 1 and 1/2 more than air (SO4 < H20)
What is the limit of flammability in air, percent of vapor in air/gas mixture? - Correct
Answers -2.15%-9.6%
What is the most commonly used odorant in LP gases and why is it added? - Correct
Answers -Ethynl Mercaptan
When liquid propane is released to the atmosphere, what is it's expansion ratio? -
Correct Answers -25%
Is propane non-toxic? - Correct Answers -Yes
Name several potential sources of ignition? - Correct Answers -Fans, switches, car
ignitions, static, cigs.
When the outside temperature increases, what happens to propane inside a container?
- Correct Answers -Increase pressure
Name THREE types of specifications which propane containers are manufactured
under. - Correct Answers -Container info/ filling connections valves/ product storage
area
What does DOT stand for? ASME? FAA? - Correct Answers -Department of
Transportation, American Society of Mech. Engineering, Federal Aviation Admin.
How long after manufacture may a DOT Steel or Aluminum cylinder be used before re-
certification is required? How many re-certifications are allowed? - Correct Answers -12
years, every 5, 7, 12 years (as many as you want).
, How long after manufacture may a DOT Composite cylinder be used before re-
certification is required? - Correct Answers -5 years and every 5 years after 15 year
max
Where is the identification information found on a DOT cylinder? On an ASME tank? -
Correct Answers -DOT: Collar/ Neck Ring/ Body. ASME: Data Plate
If an ASME container does not have a data plate, but appears to be in good condition,
can it be filled? - Correct Answers -NO
Can a licensed dispensing unit operator re-qualify DOT cylinders for continued use? -
Correct Answers -NO
Name 3 types of re-qualification that can determine if a DOT cylinder is acceptable for
safe continued use. - Correct Answers -External visual inspection, proof pressure
method, volumetric expansion method.
The cylinder marking 4BW-240 tells you what? - Correct Answers -4bw- cylinder
specification type
240- cylinder service pressure
How does a back flow check valve work? - Correct Answers -Always close unless fuel
from outside forces open
What is the purpose of a relief valve? - Correct Answers -Release vapor pressure to
atomsphere to maintain pressure inside container
What information does a fixed liquid level gauge give you? - Correct Answers -When the
tank is 80% full
What should a vapor service valve (POL) be equipped with when disconnected? -
Correct Answers -Plug or Cap
What does the excess flow in a liquid service valve do? - Correct Answers -Permits flow
of gas in either direction/ closes when flows too fast
What is an OPD and what is its purpose? - Correct Answers -Overfill prevention device/
prevents overfilling
Can you rely on an OPD valve for accurate filling of a DOT cylinder - Correct Answers -
NO
Is the float gauge alone a suitable method for filling - Correct Answers -NO
What must be done before a new DOT container may be filled - Correct Answers -Purge
