Updated 2026 South Carolina LP Gas Dealer & Installer Licensure
Exam Comprehensive Practice Set 2026
DESCRIPTION
This South Carolina LP Gas Dealer & Installer Practice Exam is a professional-grade
study resource designed for candidates seeking licensure through the SC Department
of Labor, Licensing and Regulation (LLR).
Exam Summary
Primary Focus: Mastery of NFPA 58 (Liquefied Petroleum Gas Code) and NFPA
54 (National Fuel Gas Code).
Target Audience: Class I Dealers, Class II Installers, and Service Technicians.
Content Pillars: Tank siting distances, high/low-pressure piping, appliance venting,
leak testing protocols, and South Carolina administrative statutes.
Key Features
Comprehensive Coverage: 200 Multiple-Choice Questions spanning residential,
commercial, and industrial LP-gas applications.
Pedagogical Rationale: Every answer includes a detailed explanation in
italics citing specific code logic to ensure conceptual understanding rather than
rote memorization.
High-Yield Topics: Heavy emphasis on container clearances, combustion air
requirements, regulator stages, and emergency shut-off systems.
This set is optimized for platforms like Stuvia to assist students in passing the SC LLR
state exam on the first attempt by simulating the actual testing environment.
1. According to NFPA 58, what is the minimum horizontal distance between a
point of transfer and a door or window of a building with at least one fire-rated
exit?
A) 5 feet
2026 Question And ANSWER Latest Update
,B) 10 feet
C) 15 feet
D) 25 feet
Answer: D
Rationale: NFPA 58 requires a 25-foot clearance to ensure that if a leak occurs during
the transfer process, gas vapors do not enter the building through openings where
ignition sources might exist.
2. LP-Gas containers must be painted a light-reflecting color. What is the primary
safety reason for this South Carolina requirement?
A) To prevent the steel from rusting.
B) To make the tank visible to delivery drivers.
C) To minimize internal pressure increases caused by solar radiation.
D) To identify the tank as a non-medical gas.
Answer: C
Rationale: Dark colors absorb heat, causing the liquid propane to expand and the vapor
pressure to rise. Light colors reflect heat, keeping the pressure below the safety relief
valve setting.
3. When installing a 1,000-gallon water capacity (w.c.) tank, what is the minimum
distance required from the container to a "source of ignition"?
A) 5 feet
B) 10 feet
C) 25 feet
D) 50 feet
Answer: C
Rationale: For containers between 501 and 2,000 gallons w.c., NFPA 58 specifies a 25-
foot distance from any source of ignition, such as an AC compressor or open-flame
heater.
4. Under NFPA 54, what is the required test pressure for a new gas piping
system?
A) 10 psi for 10 minutes.
B) 1.5 times the maximum working pressure, but not less than 3 psi.
C) 50 psi for 24 hours.
D) The same as the container pressure.
Answer: B
Rationale: NFPA 54 mandates that the test pressure must be at least 1.5 times the
proposed maximum working pressure to ensure the structural integrity of all joints.
2026 Question And ANSWER Latest Update
,5. Which material is PROHIBITED for use in LP-Gas underground piping systems
in South Carolina?
A) Polyethylene (PE) pipe with a tracer wire.
B) Type L copper tubing with protective coating.
C) Schedule 40 un-coated black steel pipe.
D) Anodeless risers.
Answer: C
Rationale: Bare black steel pipe will corrode rapidly in soil. NFPA 58 requires
underground metallic piping to be protected with factory-applied coating and cathodic
protection.
6. Propane has a specific gravity of approximately 1.50. This means that in its
vapor state, propane is:
A) Lighter than air and will rise.
B) Heavier than air and will pool in low areas.
C) The same weight as air.
D) Only flammable when mixed with water.
Answer: B
Rationale: Because propane is 1.5 times heavier than air, it settles in basements and
crawlspaces, making leak detection near floor levels critical.
7. A "Category I" appliance, such as a standard water heater, is defined by what
venting characteristics?
A) Positive vent pressure and condensing.
B) Negative vent pressure and non-condensing.
C) Positive vent pressure and non-condensing.
D) High-pressure mechanical draft.
Answer: B
Rationale: Category I appliances rely on natural buoyancy to exhaust flue gases. The
vent pressure is negative/atmospheric, and the temperature prevents condensation.
8. What is the maximum permitted length of a flexible "appliance connector" used
to connect a domestic range to the gas piping?
A) 3 feet
B) 6 feet
C) 10 feet
D) There is no limit.
Answer: B
2026 Question And ANSWER Latest Update
, Rationale: NFPA 54 restricts the length of flexible connectors to 6 feet to minimize the
risk of kinking or excessive pressure drop.
9. When an LP-Gas regulator is installed outdoors, the vent must be pointed in
what direction?
A) Toward the building.
B) Upward to allow gas to rise.
C) Vertically downward.
D) Toward the nearest ignition source.
Answer: C
Rationale: Regulators must be installed with the vent pointing downward to prevent rain,
ice, or debris from entering and blocking the internal diaphragm.
10. In South Carolina, what is the most common odorant added to propane for
leak detection?
A) Carbon Monoxide.
B) Ethyl Mercaptan.
C) Methane.
D) Butane.
Answer: B
Rationale: Propane is naturally odorless. Ethyl Mercaptan is added at a rate of 1 lb per
10,000 gallons so that leaks can be detected by smell.
11. A 500-gallon aboveground LP-gas tank must be located at least how many
feet from a line of adjoining property that can be built upon?
A) 5 feet
B) 10 feet
C) 25 feet
D) 50 feet
Answer: B
Rationale: Per NFPA 58 Table 6.3.1, tanks with a water capacity of 125 to 500 gallons
require a 10-foot minimum distance to property lines.
12. What is the maximum filling limit for an LP-gas container by volume?
A) 100%
B) 90%
C) 80%
D) 75%
Answer: C
2026 Question And ANSWER Latest Update
Exam Comprehensive Practice Set 2026
DESCRIPTION
This South Carolina LP Gas Dealer & Installer Practice Exam is a professional-grade
study resource designed for candidates seeking licensure through the SC Department
of Labor, Licensing and Regulation (LLR).
Exam Summary
Primary Focus: Mastery of NFPA 58 (Liquefied Petroleum Gas Code) and NFPA
54 (National Fuel Gas Code).
Target Audience: Class I Dealers, Class II Installers, and Service Technicians.
Content Pillars: Tank siting distances, high/low-pressure piping, appliance venting,
leak testing protocols, and South Carolina administrative statutes.
Key Features
Comprehensive Coverage: 200 Multiple-Choice Questions spanning residential,
commercial, and industrial LP-gas applications.
Pedagogical Rationale: Every answer includes a detailed explanation in
italics citing specific code logic to ensure conceptual understanding rather than
rote memorization.
High-Yield Topics: Heavy emphasis on container clearances, combustion air
requirements, regulator stages, and emergency shut-off systems.
This set is optimized for platforms like Stuvia to assist students in passing the SC LLR
state exam on the first attempt by simulating the actual testing environment.
1. According to NFPA 58, what is the minimum horizontal distance between a
point of transfer and a door or window of a building with at least one fire-rated
exit?
A) 5 feet
2026 Question And ANSWER Latest Update
,B) 10 feet
C) 15 feet
D) 25 feet
Answer: D
Rationale: NFPA 58 requires a 25-foot clearance to ensure that if a leak occurs during
the transfer process, gas vapors do not enter the building through openings where
ignition sources might exist.
2. LP-Gas containers must be painted a light-reflecting color. What is the primary
safety reason for this South Carolina requirement?
A) To prevent the steel from rusting.
B) To make the tank visible to delivery drivers.
C) To minimize internal pressure increases caused by solar radiation.
D) To identify the tank as a non-medical gas.
Answer: C
Rationale: Dark colors absorb heat, causing the liquid propane to expand and the vapor
pressure to rise. Light colors reflect heat, keeping the pressure below the safety relief
valve setting.
3. When installing a 1,000-gallon water capacity (w.c.) tank, what is the minimum
distance required from the container to a "source of ignition"?
A) 5 feet
B) 10 feet
C) 25 feet
D) 50 feet
Answer: C
Rationale: For containers between 501 and 2,000 gallons w.c., NFPA 58 specifies a 25-
foot distance from any source of ignition, such as an AC compressor or open-flame
heater.
4. Under NFPA 54, what is the required test pressure for a new gas piping
system?
A) 10 psi for 10 minutes.
B) 1.5 times the maximum working pressure, but not less than 3 psi.
C) 50 psi for 24 hours.
D) The same as the container pressure.
Answer: B
Rationale: NFPA 54 mandates that the test pressure must be at least 1.5 times the
proposed maximum working pressure to ensure the structural integrity of all joints.
2026 Question And ANSWER Latest Update
,5. Which material is PROHIBITED for use in LP-Gas underground piping systems
in South Carolina?
A) Polyethylene (PE) pipe with a tracer wire.
B) Type L copper tubing with protective coating.
C) Schedule 40 un-coated black steel pipe.
D) Anodeless risers.
Answer: C
Rationale: Bare black steel pipe will corrode rapidly in soil. NFPA 58 requires
underground metallic piping to be protected with factory-applied coating and cathodic
protection.
6. Propane has a specific gravity of approximately 1.50. This means that in its
vapor state, propane is:
A) Lighter than air and will rise.
B) Heavier than air and will pool in low areas.
C) The same weight as air.
D) Only flammable when mixed with water.
Answer: B
Rationale: Because propane is 1.5 times heavier than air, it settles in basements and
crawlspaces, making leak detection near floor levels critical.
7. A "Category I" appliance, such as a standard water heater, is defined by what
venting characteristics?
A) Positive vent pressure and condensing.
B) Negative vent pressure and non-condensing.
C) Positive vent pressure and non-condensing.
D) High-pressure mechanical draft.
Answer: B
Rationale: Category I appliances rely on natural buoyancy to exhaust flue gases. The
vent pressure is negative/atmospheric, and the temperature prevents condensation.
8. What is the maximum permitted length of a flexible "appliance connector" used
to connect a domestic range to the gas piping?
A) 3 feet
B) 6 feet
C) 10 feet
D) There is no limit.
Answer: B
2026 Question And ANSWER Latest Update
, Rationale: NFPA 54 restricts the length of flexible connectors to 6 feet to minimize the
risk of kinking or excessive pressure drop.
9. When an LP-Gas regulator is installed outdoors, the vent must be pointed in
what direction?
A) Toward the building.
B) Upward to allow gas to rise.
C) Vertically downward.
D) Toward the nearest ignition source.
Answer: C
Rationale: Regulators must be installed with the vent pointing downward to prevent rain,
ice, or debris from entering and blocking the internal diaphragm.
10. In South Carolina, what is the most common odorant added to propane for
leak detection?
A) Carbon Monoxide.
B) Ethyl Mercaptan.
C) Methane.
D) Butane.
Answer: B
Rationale: Propane is naturally odorless. Ethyl Mercaptan is added at a rate of 1 lb per
10,000 gallons so that leaks can be detected by smell.
11. A 500-gallon aboveground LP-gas tank must be located at least how many
feet from a line of adjoining property that can be built upon?
A) 5 feet
B) 10 feet
C) 25 feet
D) 50 feet
Answer: B
Rationale: Per NFPA 58 Table 6.3.1, tanks with a water capacity of 125 to 500 gallons
require a 10-foot minimum distance to property lines.
12. What is the maximum filling limit for an LP-gas container by volume?
A) 100%
B) 90%
C) 80%
D) 75%
Answer: C
2026 Question And ANSWER Latest Update
