New Mexico (NM) LP-3S Retail Sale of LP
Gas Practice Exam Questions and
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1. A person who sells liquefied petroleum gas at retail in New Mexico must hold a valid
LP-3S certificate issued by:
A) The New Mexico Environment Department
B) The New Mexico Public Regulation Commission
C) The New Mexico State Fire Marshal’s Office
D) The U.S. Department of Transportation
Answer: C
Explanation: The New Mexico State Fire Marshal’s Office has jurisdiction over LP gas safety
and licensing for retail sellers under the LP-3S program, per NM administrative code.
2. The maximum allowable filling density for a propane cylinder transported by highway
is:
A) 42%
B) 57%
C) 80%
D) 100%
Answer: A
Explanation: 42% filling density by weight of water capacity is the DOT limit for propane
cylinders in transport to allow for liquid expansion.
,3. When performing a leak test on an LP gas system, the maximum allowable pressure
drop over 10 minutes is:
A) 0 psi
B) 1 psi
C) 3 psi
D) 5 psi
Answer: B
Explanation: NFPA 58 allows a 1 psi drop over 10 minutes for a properly conducted leak
test using a manometer.
4. What is the minimum required odorant level for LP gas to ensure detection by a
person with a normal sense of smell?
A) 0.5 lb ethyl mercaptan per 10,000 gallons
B) 1.0 lb ethyl mercaptan per 10,000 gallons
C) 1.5 lb ethyl mercaptan per 10,000 gallons
D) 2.0 lb ethyl mercaptan per 10,000 gallons
Answer: B
Explanation: NFPA 58 requires at least 1.0 lb of ethyl mercaptan per 10,000 gallons of LP
gas to produce a distinct odor.
5. A delivery driver notices a cylinder with a damaged relief valve. The driver should:
A) Note the damage and continue delivery
B) Replace the relief valve with any available valve
C) Remove the cylinder from service and report it
,D) Tighten the valve with a wrench
Answer: C
Explanation: Damaged relief valves are a safety hazard and must be removed from service
immediately and reported to the supervisor.
6. The maximum working pressure for a low-pressure LP gas system in a building is:
A) 0.5 psig
B) 2 psig
C) 5 psig
D) 10 psig
Answer: A
*Explanation: Low-pressure systems in buildings are limited to 0.5 psig (14 inches water
column) per NFPA 54.*
7. A container that has been out of service must be inspected before refilling. The
inspection must include checking for:
A) Rust and dents only
B) Rust, dents, fire damage, and valve condition
C) Paint color only
D) Expiration date only
Answer: B
Explanation: A thorough visual inspection for external corrosion, dents, fire damage, and
valve operability is required per NFPA 58.
, 8. Which of the following is a DOT specification for a propane cylinder?
A) 4BA
B) 3AA
C) 4BW
D) 4B
Answer: B
Explanation: DOT 3AA is a specification for seamless steel cylinders used for LP gas; 4B is
not a valid DOT LP gas cylinder spec.
9. The maximum filling limit for an ASME cargo tank used for propane delivery is:
A) 42% of water capacity
B) 80% of water capacity
C) 85% of water capacity
D) 100% of water capacity
Answer: B
Explanation: ASME tanks are filled to 80% of water capacity to allow for thermal
expansion.
10. A customer calls complaining of a “rotten egg” smell. The LP-3S holder should first:
A) Advise the customer to open windows
B) Instruct the customer to evacuate and call 911
C) Tell the customer to light a match to check for gas
D) Ignore the call if after hours
Answer: B
Explanation: Immediate evacuation and emergency response are critical; never instruct a
customer to create an ignition source.
Gas Practice Exam Questions and
Answers Best rated A+ Guaranteed
Success Latest Update
1. A person who sells liquefied petroleum gas at retail in New Mexico must hold a valid
LP-3S certificate issued by:
A) The New Mexico Environment Department
B) The New Mexico Public Regulation Commission
C) The New Mexico State Fire Marshal’s Office
D) The U.S. Department of Transportation
Answer: C
Explanation: The New Mexico State Fire Marshal’s Office has jurisdiction over LP gas safety
and licensing for retail sellers under the LP-3S program, per NM administrative code.
2. The maximum allowable filling density for a propane cylinder transported by highway
is:
A) 42%
B) 57%
C) 80%
D) 100%
Answer: A
Explanation: 42% filling density by weight of water capacity is the DOT limit for propane
cylinders in transport to allow for liquid expansion.
,3. When performing a leak test on an LP gas system, the maximum allowable pressure
drop over 10 minutes is:
A) 0 psi
B) 1 psi
C) 3 psi
D) 5 psi
Answer: B
Explanation: NFPA 58 allows a 1 psi drop over 10 minutes for a properly conducted leak
test using a manometer.
4. What is the minimum required odorant level for LP gas to ensure detection by a
person with a normal sense of smell?
A) 0.5 lb ethyl mercaptan per 10,000 gallons
B) 1.0 lb ethyl mercaptan per 10,000 gallons
C) 1.5 lb ethyl mercaptan per 10,000 gallons
D) 2.0 lb ethyl mercaptan per 10,000 gallons
Answer: B
Explanation: NFPA 58 requires at least 1.0 lb of ethyl mercaptan per 10,000 gallons of LP
gas to produce a distinct odor.
5. A delivery driver notices a cylinder with a damaged relief valve. The driver should:
A) Note the damage and continue delivery
B) Replace the relief valve with any available valve
C) Remove the cylinder from service and report it
,D) Tighten the valve with a wrench
Answer: C
Explanation: Damaged relief valves are a safety hazard and must be removed from service
immediately and reported to the supervisor.
6. The maximum working pressure for a low-pressure LP gas system in a building is:
A) 0.5 psig
B) 2 psig
C) 5 psig
D) 10 psig
Answer: A
*Explanation: Low-pressure systems in buildings are limited to 0.5 psig (14 inches water
column) per NFPA 54.*
7. A container that has been out of service must be inspected before refilling. The
inspection must include checking for:
A) Rust and dents only
B) Rust, dents, fire damage, and valve condition
C) Paint color only
D) Expiration date only
Answer: B
Explanation: A thorough visual inspection for external corrosion, dents, fire damage, and
valve operability is required per NFPA 58.
, 8. Which of the following is a DOT specification for a propane cylinder?
A) 4BA
B) 3AA
C) 4BW
D) 4B
Answer: B
Explanation: DOT 3AA is a specification for seamless steel cylinders used for LP gas; 4B is
not a valid DOT LP gas cylinder spec.
9. The maximum filling limit for an ASME cargo tank used for propane delivery is:
A) 42% of water capacity
B) 80% of water capacity
C) 85% of water capacity
D) 100% of water capacity
Answer: B
Explanation: ASME tanks are filled to 80% of water capacity to allow for thermal
expansion.
10. A customer calls complaining of a “rotten egg” smell. The LP-3S holder should first:
A) Advise the customer to open windows
B) Instruct the customer to evacuate and call 911
C) Tell the customer to light a match to check for gas
D) Ignore the call if after hours
Answer: B
Explanation: Immediate evacuation and emergency response are critical; never instruct a
customer to create an ignition source.
