1. Q: What is LP-Gas? ANSWER LP-Gas (Liquefied Petroleum Gas) is a
mixture of hydrocarbon gases, primarily propane and butane, stored under
pressure as a liquid.
2. Q: What NFPA code primarily governs LP-Gas installations in New
Mexico? ANSWER NFPA 58 - Liquefied Petroleum Gas Code.
3. Q: What is the vapor pressure of propane at 100°F? ANSWER
Approximately 172 psig.
4. Q: What is the boiling point of propane at atmospheric pressure?
ANSWER Approximately -44°F (-42°C).
5. Q: Is LP-Gas heavier or lighter than air? ANSWER LP-Gas vapor is
heavier than air, with a specific gravity of approximately 1.5 times that of air.
6. Q: What is the primary hazard associated with LP-Gas? ANSWER
Flammability and potential for explosion when mixed with air in certain
concentrations.
7. Q: What is the flammable range of propane in air? ANSWER
Approximately 2.1% to 9.5% by volume.
8. Q: What odorant is typically added to LP-Gas? ANSWER Ethyl
mercaptan or a similar sulfur-based odorant.
9. Q: Why is an odorant added to LP-Gas? ANSWER To make gas leaks
detectable by smell for safety purposes.
10. Q: What is the minimum odor concentration required for detection?
ANSWER The odorant must be detectable at one-fifth of the lower flammable
limit.
,11. Q: What does DOT stand for in LP-Gas regulations? ANSWER
Department of Transportation.
12. Q: What is an ASME container? ANSWER A container constructed
according to American Society of Mechanical Engineers standards.
13. Q: What is the water capacity of a container? ANSWER The volume of
water the container will hold at 60°F, expressed in pounds or gallons.
14. Q: What is the maximum filling density for propane in an ASME
container? ANSWER Generally 42% for above-ground containers in
temperate climates.
15. Q: What does the term "filling density" mean? ANSWER The
percentage of the container's water capacity that can be filled with liquid LP-
Gas.
16. Q: What is a relief valve? ANSWER A safety device designed to prevent
excessive pressure buildup in a container.
17. Q: At what pressure do relief valves typically open on propane
containers? ANSWER Between 250 and 375 psig, depending on container
specifications.
18. Q: What is a hydrostatic relief valve? ANSWER A valve that relieves
pressure caused by thermal expansion of trapped liquid.
19. Q: Can LP-Gas dispensing stations be located in buildings? ANSWER
Generally no, unless specific provisions in NFPA 58 are met.
20. Q: What is the purpose of excess flow valves? ANSWER To
automatically restrict gas flow in case of line rupture or excessive flow.
21. Q: What is a fixed liquid level gauge? ANSWER A device that indicates
when the container has reached its maximum permitted filling level.
22. Q: What percentage does a fixed liquid level gauge typically indicate?
ANSWER 80% for above-ground tanks and up to 85% for underground tanks.
23. Q: What is a variable liquid level gauge? ANSWER A gauge that
continuously indicates the level of liquid in the container.
24. Q: What are the two types of variable liquid level gauges? ANSWER
Float-type and magnetic-type gauges.
25. Q: What is a service pressure rating? ANSWER The maximum
allowable working pressure for which equipment is designed.
, 26. Q: What is the typical service pressure for LP-Gas systems? ANSWER
250 psig for most containers and equipment.
27. Q: What does API stand for? ANSWER American Petroleum Institute.
28. Q: What is the purpose of a regulator in an LP-Gas system? ANSWER
To reduce high tank pressure to usable, lower pressure for appliances or
dispensing.
29. Q: What is a first-stage regulator? ANSWER A regulator that reduces
container pressure to an intermediate pressure, typically 10 psig.
30. Q: What is a second-stage regulator? ANSWER A regulator that reduces
intermediate pressure to final appliance pressure, typically 11 inches water
column.
31. Q: What is the freezing point of propane? ANSWER Approximately -
306°F (-188°C).
32. Q: Can water contamination occur in LP-Gas systems? ANSWER Yes,
though rare; water can freeze and block lines or cause corrosion.
33. Q: What is the BTU content of propane per gallon? ANSWER
Approximately 91,500 BTU per gallon.
34. Q: What is the weight of one gallon of propane at 60°F? ANSWER
Approximately 4.24 pounds.
35. Q: How many gallons are in 100 pounds of propane? ANSWER
Approximately 23.6 gallons.
36. Q: What is rollover in LP-Gas storage? ANSWER The mixing of
different density layers of liquid, which can cause rapid vaporization.
37. Q: What causes rollover? ANSWER Temperature stratification or adding
warmer liquid to colder liquid in a tank.
38. Q: What is weathering of LP-Gas? ANSWER The preferential
evaporation of lighter components, changing the fuel composition.
39. Q: What is a DOT cylinder? ANSWER A portable container
manufactured to DOT specifications for LP-Gas transportation.
40. Q: What is the maximum water capacity for a DOT cylinder before it's
considered an ASME tank? ANSWER 1,000 pounds water capacity.
41. Q: Can DOT cylinders be permanently installed? ANSWER No, DOT
cylinders are designed for portability and temporary use.
mixture of hydrocarbon gases, primarily propane and butane, stored under
pressure as a liquid.
2. Q: What NFPA code primarily governs LP-Gas installations in New
Mexico? ANSWER NFPA 58 - Liquefied Petroleum Gas Code.
3. Q: What is the vapor pressure of propane at 100°F? ANSWER
Approximately 172 psig.
4. Q: What is the boiling point of propane at atmospheric pressure?
ANSWER Approximately -44°F (-42°C).
5. Q: Is LP-Gas heavier or lighter than air? ANSWER LP-Gas vapor is
heavier than air, with a specific gravity of approximately 1.5 times that of air.
6. Q: What is the primary hazard associated with LP-Gas? ANSWER
Flammability and potential for explosion when mixed with air in certain
concentrations.
7. Q: What is the flammable range of propane in air? ANSWER
Approximately 2.1% to 9.5% by volume.
8. Q: What odorant is typically added to LP-Gas? ANSWER Ethyl
mercaptan or a similar sulfur-based odorant.
9. Q: Why is an odorant added to LP-Gas? ANSWER To make gas leaks
detectable by smell for safety purposes.
10. Q: What is the minimum odor concentration required for detection?
ANSWER The odorant must be detectable at one-fifth of the lower flammable
limit.
,11. Q: What does DOT stand for in LP-Gas regulations? ANSWER
Department of Transportation.
12. Q: What is an ASME container? ANSWER A container constructed
according to American Society of Mechanical Engineers standards.
13. Q: What is the water capacity of a container? ANSWER The volume of
water the container will hold at 60°F, expressed in pounds or gallons.
14. Q: What is the maximum filling density for propane in an ASME
container? ANSWER Generally 42% for above-ground containers in
temperate climates.
15. Q: What does the term "filling density" mean? ANSWER The
percentage of the container's water capacity that can be filled with liquid LP-
Gas.
16. Q: What is a relief valve? ANSWER A safety device designed to prevent
excessive pressure buildup in a container.
17. Q: At what pressure do relief valves typically open on propane
containers? ANSWER Between 250 and 375 psig, depending on container
specifications.
18. Q: What is a hydrostatic relief valve? ANSWER A valve that relieves
pressure caused by thermal expansion of trapped liquid.
19. Q: Can LP-Gas dispensing stations be located in buildings? ANSWER
Generally no, unless specific provisions in NFPA 58 are met.
20. Q: What is the purpose of excess flow valves? ANSWER To
automatically restrict gas flow in case of line rupture or excessive flow.
21. Q: What is a fixed liquid level gauge? ANSWER A device that indicates
when the container has reached its maximum permitted filling level.
22. Q: What percentage does a fixed liquid level gauge typically indicate?
ANSWER 80% for above-ground tanks and up to 85% for underground tanks.
23. Q: What is a variable liquid level gauge? ANSWER A gauge that
continuously indicates the level of liquid in the container.
24. Q: What are the two types of variable liquid level gauges? ANSWER
Float-type and magnetic-type gauges.
25. Q: What is a service pressure rating? ANSWER The maximum
allowable working pressure for which equipment is designed.
, 26. Q: What is the typical service pressure for LP-Gas systems? ANSWER
250 psig for most containers and equipment.
27. Q: What does API stand for? ANSWER American Petroleum Institute.
28. Q: What is the purpose of a regulator in an LP-Gas system? ANSWER
To reduce high tank pressure to usable, lower pressure for appliances or
dispensing.
29. Q: What is a first-stage regulator? ANSWER A regulator that reduces
container pressure to an intermediate pressure, typically 10 psig.
30. Q: What is a second-stage regulator? ANSWER A regulator that reduces
intermediate pressure to final appliance pressure, typically 11 inches water
column.
31. Q: What is the freezing point of propane? ANSWER Approximately -
306°F (-188°C).
32. Q: Can water contamination occur in LP-Gas systems? ANSWER Yes,
though rare; water can freeze and block lines or cause corrosion.
33. Q: What is the BTU content of propane per gallon? ANSWER
Approximately 91,500 BTU per gallon.
34. Q: What is the weight of one gallon of propane at 60°F? ANSWER
Approximately 4.24 pounds.
35. Q: How many gallons are in 100 pounds of propane? ANSWER
Approximately 23.6 gallons.
36. Q: What is rollover in LP-Gas storage? ANSWER The mixing of
different density layers of liquid, which can cause rapid vaporization.
37. Q: What causes rollover? ANSWER Temperature stratification or adding
warmer liquid to colder liquid in a tank.
38. Q: What is weathering of LP-Gas? ANSWER The preferential
evaporation of lighter components, changing the fuel composition.
39. Q: What is a DOT cylinder? ANSWER A portable container
manufactured to DOT specifications for LP-Gas transportation.
40. Q: What is the maximum water capacity for a DOT cylinder before it's
considered an ASME tank? ANSWER 1,000 pounds water capacity.
41. Q: Can DOT cylinders be permanently installed? ANSWER No, DOT
cylinders are designed for portability and temporary use.
