RV PROPANE SYSTEMS QUESTIONS
AND ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT
GUARANTEED SUCCESS!!!
Question 1
What are the two types of propane containers used on RVs?
Answer: DOT cylinders (portable containers) and ASME tanks
(permanently mounted stationary containers)
Question 2
What does OPD stand for?
Answer: Overfill Protection Device (a safety shut-off valve designed to
prevent filling a cylinder beyond 80% liquid capacity)
Question 3
How are listed RV propane appliances classified regarding their combustion
and venting design?
Answer: Sealed combustion, direct vent appliances (drawing all
combustion air from outside and venting exhaust directly outdoors)
Question 4
What is primary air?
Answer: Air that is mixed with the gas inside the burner tube prior to
ignition for initial combustion.
Question 5
What is secondary air?
Answer: Air supplied around the flame that supports complete combustion
after ignition takes place.
Question 6
What is the specific gravity of propane vapor at $60^\circ\text{F}$ relative to
air?
Answer: 1.50 (Air = 1.0; meaning propane vapor is heavier than air and
settles in low-lying areas)
Question 7
What is the expansion/compression ratio of liquid propane to vapor?
Answer: 270 to 1 (1 unit of liquid propane expands into 270 units of gas
vapor at atmospheric pressure)
Efficient burn ratio of air to gas -ANSWER ✔✔25:1
, Approximate ignition temperature -ANSWER ✔✔1000*F
Gallons to Liters -ANSWER ✔✔1 US gal = 3.785L
F* to C* -ANSWER ✔✔[(F*-32)/1.8]
Approx BTU/hr for 20 and 30 lb cylinders -ANSWER ✔✔20 (4.8gal)=439.210
30 (7.2gal)=658.814
BTU/hr for one gallon of LP -ANSWER ✔✔91502
DOT cylinders must be recertified... -ANSWER ✔✔After 12 years and every five
years thereafter
POL -ANSWER ✔✔Prest-O-Lite nut (left hand thread)
CGA-510
Whenever transporting or storing disconnected containers always use a... -
ANSWER ✔✔POL plug or dust cap
Used to withdraw LP vapor to the service valve -ANSWER ✔✔Vapor withdrawal
tube
Proper relief valve setting for ASME tank -ANSWER ✔✔312.5 psi
Single term that includes all fittings and valves on container -ANSWER
✔✔Appurtenances
The dip tube is connected to the outage valve and together is called... -ANSWER
✔✔fixed maximum liquid level gauge
Pressure setting of DOT relief valve -ANSWER ✔✔375 psi
Protects the LP system on the high pressure side of the regulator by closing when
prescribed flow rate exceeded -ANSWER ✔✔Excess Flow Valve
AND ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT
GUARANTEED SUCCESS!!!
Question 1
What are the two types of propane containers used on RVs?
Answer: DOT cylinders (portable containers) and ASME tanks
(permanently mounted stationary containers)
Question 2
What does OPD stand for?
Answer: Overfill Protection Device (a safety shut-off valve designed to
prevent filling a cylinder beyond 80% liquid capacity)
Question 3
How are listed RV propane appliances classified regarding their combustion
and venting design?
Answer: Sealed combustion, direct vent appliances (drawing all
combustion air from outside and venting exhaust directly outdoors)
Question 4
What is primary air?
Answer: Air that is mixed with the gas inside the burner tube prior to
ignition for initial combustion.
Question 5
What is secondary air?
Answer: Air supplied around the flame that supports complete combustion
after ignition takes place.
Question 6
What is the specific gravity of propane vapor at $60^\circ\text{F}$ relative to
air?
Answer: 1.50 (Air = 1.0; meaning propane vapor is heavier than air and
settles in low-lying areas)
Question 7
What is the expansion/compression ratio of liquid propane to vapor?
Answer: 270 to 1 (1 unit of liquid propane expands into 270 units of gas
vapor at atmospheric pressure)
Efficient burn ratio of air to gas -ANSWER ✔✔25:1
, Approximate ignition temperature -ANSWER ✔✔1000*F
Gallons to Liters -ANSWER ✔✔1 US gal = 3.785L
F* to C* -ANSWER ✔✔[(F*-32)/1.8]
Approx BTU/hr for 20 and 30 lb cylinders -ANSWER ✔✔20 (4.8gal)=439.210
30 (7.2gal)=658.814
BTU/hr for one gallon of LP -ANSWER ✔✔91502
DOT cylinders must be recertified... -ANSWER ✔✔After 12 years and every five
years thereafter
POL -ANSWER ✔✔Prest-O-Lite nut (left hand thread)
CGA-510
Whenever transporting or storing disconnected containers always use a... -
ANSWER ✔✔POL plug or dust cap
Used to withdraw LP vapor to the service valve -ANSWER ✔✔Vapor withdrawal
tube
Proper relief valve setting for ASME tank -ANSWER ✔✔312.5 psi
Single term that includes all fittings and valves on container -ANSWER
✔✔Appurtenances
The dip tube is connected to the outage valve and together is called... -ANSWER
✔✔fixed maximum liquid level gauge
Pressure setting of DOT relief valve -ANSWER ✔✔375 psi
Protects the LP system on the high pressure side of the regulator by closing when
prescribed flow rate exceeded -ANSWER ✔✔Excess Flow Valve
