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SAFE DISPENSING OF PROPANE EXAM QUESTIONS AND VERIFIED ANSWERS
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SAFE DISPENSING OF PROPANEEXAM QUESTIONS AND VERIFIED
ANSWERS
Name the three qualities of propane: ANSWER: colorless, odorless, and
tasteless.
ANSWER: -44 degrees is the initial boiling point of propane.
ANSWER: 4.2 pounds is the weight of one gallon of liquid propane.
In comparison to air, how heavy is propane vapor? liquid propane to water? One
and a half times greater than air (SO4 < H20) 1.5 > 1.
What percentage of vapor in an air/gas mixture is the limit of flammability in
air? ANSWER: 2.15% to 9.6%
Which LP gas odorant is most frequently used, and why is it added? ANSWER
Mercaptan Ethynl
What is the expansion ratio of liquid propane released into the atmosphere?
ANSWER 25%
Is propane safe to use? ANSWER: In agreement
List a few possible ignition sources. ANSWER Cigarettes, fans, switches,
automobile ignitions, and static.
What happens to propane inside a container as the temperature outside rises?
ANSWER Put more pressure on
Name Propane canisters are made in accordance with THREE different sorts of
requirements. ANSWER Product storage area, filling connection valves, and
container details
, What is the meaning of DOT? ASME? FAA? ANSWER Federal Aviation
Administration, American Society of Mechanical Engineering, Department of
Transportation.
How long can a DOT Steel or Aluminum cylinder be used once it is
manufactured before it needs to be recertified? How many times can you
recertify? ANSWER: 12 years, with intervals of 5, 7, 12, or as many as you'd
want.
How long can a DOT Composite cylinder be in service after it is manufactured
before it needs to be recertified? ANSWER 5 years and then every 5 years
following a maximum of 15 years
On a DOT cylinder, where is the identification information located? On a tank
that is ASME? ANSWER DOT: Body, Neck Ring, Collar. ASME: Plate of Data
Can an ASME container that looks to be in good condition but lacks a data plate
be filled? ANSWER NO
Can DOT cylinders be re-qualified for ongoing use by a licensed operator of a
dispensing unit? ANSWER NO
Identify the three re-qualification processes that can be used to decide if a DOT
cylinder is suitable for ongoing, safe usage. ANSWER external visual
inspection, the volumetric expansion method, and the proof pressure method.
What does the cylinder with the label 4BW-240 tell you? ANSWER 240-
cylinder service pressure and 4bw-cylinder specification type
What is the operation of a backflow check valve? ANSWER Close at all times
unless external fuel opens.
What is a relief valve used for? ANSWER To keep the pressure inside the
container constant, release the vapor pressure into the atomsphere.
What can you learn from a fixed liquid level gauge? ANSWER When the tank
is eighty percent filled
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