NM LP-5 INSTALLATION SERVICE AND
REPAIR EXAM 2026 PRACTICE
QUESTIONS AND ANSWERS + rationals
pdf
EXAM OVERVIEW
The New Mexico LP-5 Installation, Service, and Repair Exam is a specialized
licensing test administered by PSI for propane professionals. It rigorously assesses
competency in the safe installation, maintenance, and repair of Liquefied
Petroleum Gas (LPG) systems.
Key Reference Codes:
• NFPA 54 – National Fuel Gas Code
• NFPA 58 – Liquefied Petroleum Gas Code
License Classification: LP-5 license authorizes installation, service, and repair of
LP gas systems, including liquid transfer facilities.
License Renewal: Every 3 years.
Exam Provider: PSI (Professional Services, Inc.)
SECTION 1: INSTALLATION PROCEDURES (Questions 1-20)
,1. Before beginning any installation of an NM LP-5 unit, the first step should be
to:
A) Connect power temporarily
B) Read the manufacturer's installation manual
C) Remove all panels for inspection
D) Apply lubricant to moving parts
Correct Answer: B
Rationale: Always consult the manufacturer's installation manual first to
understand specific requirements, torque values, clearance, and safety warnings.
Skipping this step can lead to improper installation, voided warranty, or hazardous
conditions.
2. When installing an NM LP-5 regulator, what is the minimum required
clearance from a building opening?
A) 1 foot
B) 3 feet
C) 5 feet
D) 10 feet
Correct Answer: B
Rationale: NFPA 58 and typical LP-gas codes require a minimum of 3
feet clearance from building openings (windows, doors, vents) to prevent gas
accumulation from entering the structure in case of a leak.
,3. What is the correct orientation for installing an NM LP-5 pressure relief
valve?
A) Upside down
B) Horizontal only
C) Vertical with spindle upright
D) Any orientation
Correct Answer: C
Rationale: Relief valves must be installed vertically with the spindle/stem
upright to ensure proper sealing and operation; otherwise, debris or gravity can
impede function.
4. The primary purpose of the sediment trap in an NM LP-5 installation is to:
A) Increase gas pressure
B) Catch debris and condensate
C) Reduce gas temperature
D) Act as a shut-off valve
Correct Answer: B
Rationale: Sediment traps (drip legs) collect dirt, pipe scale, and moisture before
they enter the regulator or appliance, protecting internal components.
5. What type of pipe joint compound is approved for NM LP-5 gas lines?
, A) White Teflon tape only
B) Any PTFE tape
C) Yellow PTFE tape or gas-rated pipe dope
D) Standard plumber's putty
Correct Answer: C
Rationale: Yellow PTFE tape is specifically rated for gas lines (thicker and more
resistant). White tape is for water applications. Plumber's putty degrades and is not
approved for gas lines.
6. The maximum allowable operating pressure for an NM LP-5 low-pressure
system is typically:
A) 0.5 psi
B) 5 psi
C) 2 psi
D) 10 psi
Correct Answer: A
Rationale: Low-pressure propane systems usually operate at 11 inches water
column (about 0.4 psi), so 0.5 psi is the common maximum allowable operating
pressure.
7. The NM LP-5's primary power supply should be:
REPAIR EXAM 2026 PRACTICE
QUESTIONS AND ANSWERS + rationals
EXAM OVERVIEW
The New Mexico LP-5 Installation, Service, and Repair Exam is a specialized
licensing test administered by PSI for propane professionals. It rigorously assesses
competency in the safe installation, maintenance, and repair of Liquefied
Petroleum Gas (LPG) systems.
Key Reference Codes:
• NFPA 54 – National Fuel Gas Code
• NFPA 58 – Liquefied Petroleum Gas Code
License Classification: LP-5 license authorizes installation, service, and repair of
LP gas systems, including liquid transfer facilities.
License Renewal: Every 3 years.
Exam Provider: PSI (Professional Services, Inc.)
SECTION 1: INSTALLATION PROCEDURES (Questions 1-20)
,1. Before beginning any installation of an NM LP-5 unit, the first step should be
to:
A) Connect power temporarily
B) Read the manufacturer's installation manual
C) Remove all panels for inspection
D) Apply lubricant to moving parts
Correct Answer: B
Rationale: Always consult the manufacturer's installation manual first to
understand specific requirements, torque values, clearance, and safety warnings.
Skipping this step can lead to improper installation, voided warranty, or hazardous
conditions.
2. When installing an NM LP-5 regulator, what is the minimum required
clearance from a building opening?
A) 1 foot
B) 3 feet
C) 5 feet
D) 10 feet
Correct Answer: B
Rationale: NFPA 58 and typical LP-gas codes require a minimum of 3
feet clearance from building openings (windows, doors, vents) to prevent gas
accumulation from entering the structure in case of a leak.
,3. What is the correct orientation for installing an NM LP-5 pressure relief
valve?
A) Upside down
B) Horizontal only
C) Vertical with spindle upright
D) Any orientation
Correct Answer: C
Rationale: Relief valves must be installed vertically with the spindle/stem
upright to ensure proper sealing and operation; otherwise, debris or gravity can
impede function.
4. The primary purpose of the sediment trap in an NM LP-5 installation is to:
A) Increase gas pressure
B) Catch debris and condensate
C) Reduce gas temperature
D) Act as a shut-off valve
Correct Answer: B
Rationale: Sediment traps (drip legs) collect dirt, pipe scale, and moisture before
they enter the regulator or appliance, protecting internal components.
5. What type of pipe joint compound is approved for NM LP-5 gas lines?
, A) White Teflon tape only
B) Any PTFE tape
C) Yellow PTFE tape or gas-rated pipe dope
D) Standard plumber's putty
Correct Answer: C
Rationale: Yellow PTFE tape is specifically rated for gas lines (thicker and more
resistant). White tape is for water applications. Plumber's putty degrades and is not
approved for gas lines.
6. The maximum allowable operating pressure for an NM LP-5 low-pressure
system is typically:
A) 0.5 psi
B) 5 psi
C) 2 psi
D) 10 psi
Correct Answer: A
Rationale: Low-pressure propane systems usually operate at 11 inches water
column (about 0.4 psi), so 0.5 psi is the common maximum allowable operating
pressure.
7. The NM LP-5's primary power supply should be:
