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Safe Dispensing of Propane Exam Questions and Answers 2024
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Safe Dispensing of Propane Exam Questions and Answers
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Safe Dispensing of Propane Exam Questions and AnswersName 3 characteristics of propane - Answer- colorless, odorless, tasteless
What is the initial boiling point of propane - Answer- -44 degrees
What does one gallon of liquid propane weigh in pounds - Answer- 4.2 pounds
How heavy is propane vapor compared to air? Propane liquid to water? - Answer- 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? - Answer- 2.15%-9.6%
What is the most commonly used odorant in LP gases and why is it added? - Answer- Ethynl Mercaptan
When liquid propane is released to the atmosphere, what is it's expansion ratio? - Answer- 25%
Is propane non-toxic? - Answer- Yes
Name several potential sources of ignition? - Answer- Fans, switches, car ignitions, static, cigs.
When the outside temperature increases, what happens to propane inside a container? - Answer- Increase pressure
Name THREE types of specifications which propane containers are manufactured under. - Answer- Container info/ filling connections valves/ product storage area
What does DOT stand for? ASME? FAA? - Answer- 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? - Answer- 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? - Answer- 5 years and every 5 years after 15 year max
Where is the identification information found on a DOT cylinder? On an ASME tank? - Answer- 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? - Answer- NO
Can a licensed dispensing unit operator re-qualify DOT cylinders for continued use? - Answer- NO
Name 3 types of re-qualification that can determine if a DOT cylinder is acceptable for safe continued use. - Answer- External visual inspection, proof pressure method, volumetric expansion method.
The cylinder marking 4BW-240 tells you what? - Answer- 4bw- cylinder specification type
240- cylinder service pressure
How does a back flow check valve work? - Answer- Always close unless fuel from outside forces open
What is the purpose of a relief valve? - Answer- Release vapor pressure to atomsphere to maintain pressure inside container
What information does a fixed liquid level gauge give you? - Answer- When the tank is 80% full
What should a vapor service valve (POL) be equipped with when disconnected? - Answer- Plug or Cap
What does the excess flow in a liquid service valve do? - Answer- Permits flow of gas in
either direction/ closes when flows too fast
What is an OPD and what is its purpose? - Answer- Overfill prevention device/ prevents overfilling
Can you rely on an OPD valve for accurate filling of a DOT cylinder - Answer- NO
Is the float gauge alone a suitable method for filling - Answer- NO
What must be done before a new DOT container may be filled - Answer- Purge
Before filling a motor home, what steps should you take? - Answer- Motor off, brakes set, passengers out
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