G33 Master Gas Pipe Fitter Exam With
Actual Questions & Verified Answers
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Verified For Guaranteed Pass
2026/Latest Update/Instant Download
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1. A sediment trap must be installed on which type of gas
appliance?
A. Any appliance over 150,000 BTU
B. Appliances with regulators
C. Appliances susceptible to debris intrusion
D. Appliances with electronic ignition
C
Sediment traps protect sensitive appliances from debris; code
requires them where debris could cause malfunction.
2. Black steel pipe used for gas piping must comply with which
standard?
A. ASTM A53
B. ASTM A36
C. ASTM A500
D. ASTM B88
A
Gas piping uses ASTM A53 steel pipe; A36 is structural steel,
A500 tubing, B88 copper plumbing.
,3. The minimum test pressure for a new low-pressure gas system
(under 2 psi) is:
A. 1 psi
B. 3 psi
C. 10 psi
D. 20 psi
C
Code requires not less than 10 psi for a minimum 15-minute
test for low-pressure systems.
4. Threaded steel gas pipe must have threads conforming to:
A. NPT
B. BSP
C. NPS
D. TPI
A
NPT is the required tapered standard for gas-tight threaded
joints.
5. A gas pipe passing through a masonry wall must be:
A. Unprotected
B. Wrapped or sleeved
C. Threaded at both ends
D. Filled with mortar
B
Piping must be protected from corrosion and abrasion when
penetrating masonry.
6. The allowable pressure drop for a natural gas piping system is
normally:
A. 0.1 in. w.c.
B. 0.3 in. w.c.
, C. 0.5 in. w.c.
D. 1.0 in. w.c.
C
Standard sizing assumes 0.5" w.c. drop unless otherwise
engineered.
7. When sizing gas piping, the length used is:
A. Exact length to the appliance
B. Longest run in the system
C. Sum of all branches
D. Distance to the meter only
B
Sizing is based on the longest run for safety and simplicity.
8. Which pipe is prohibited for interior natural gas distribution?
A. Black steel
B. Corrugated stainless steel tubing
C. Copper tubing (in some jurisdictions)
D. PVC
D
PVC is never permitted for gas piping due to temperature and
permeability issues.
9. A manual shutoff valve must be located:
A. At the meter only
B. At the appliance only
C. At both meter and appliance
D. Only where the inspector can see it
C
Code requires accessible shutoffs at meter and appliance.
10. Excess flow valves are used to:
A. Regulate pressure
Actual Questions & Verified Answers
,Plus Explained Rationales/Expert
Verified For Guaranteed Pass
2026/Latest Update/Instant Download
1. A sediment trap must be installed on which type of gas
appliance?
A. Any appliance over 150,000 BTU
B. Appliances with regulators
C. Appliances susceptible to debris intrusion
D. Appliances with electronic ignition
C
Sediment traps protect sensitive appliances from debris; code
requires them where debris could cause malfunction.
2. Black steel pipe used for gas piping must comply with which
standard?
A. ASTM A53
B. ASTM A36
C. ASTM A500
D. ASTM B88
A
Gas piping uses ASTM A53 steel pipe; A36 is structural steel,
A500 tubing, B88 copper plumbing.
,3. The minimum test pressure for a new low-pressure gas system
(under 2 psi) is:
A. 1 psi
B. 3 psi
C. 10 psi
D. 20 psi
C
Code requires not less than 10 psi for a minimum 15-minute
test for low-pressure systems.
4. Threaded steel gas pipe must have threads conforming to:
A. NPT
B. BSP
C. NPS
D. TPI
A
NPT is the required tapered standard for gas-tight threaded
joints.
5. A gas pipe passing through a masonry wall must be:
A. Unprotected
B. Wrapped or sleeved
C. Threaded at both ends
D. Filled with mortar
B
Piping must be protected from corrosion and abrasion when
penetrating masonry.
6. The allowable pressure drop for a natural gas piping system is
normally:
A. 0.1 in. w.c.
B. 0.3 in. w.c.
, C. 0.5 in. w.c.
D. 1.0 in. w.c.
C
Standard sizing assumes 0.5" w.c. drop unless otherwise
engineered.
7. When sizing gas piping, the length used is:
A. Exact length to the appliance
B. Longest run in the system
C. Sum of all branches
D. Distance to the meter only
B
Sizing is based on the longest run for safety and simplicity.
8. Which pipe is prohibited for interior natural gas distribution?
A. Black steel
B. Corrugated stainless steel tubing
C. Copper tubing (in some jurisdictions)
D. PVC
D
PVC is never permitted for gas piping due to temperature and
permeability issues.
9. A manual shutoff valve must be located:
A. At the meter only
B. At the appliance only
C. At both meter and appliance
D. Only where the inspector can see it
C
Code requires accessible shutoffs at meter and appliance.
10. Excess flow valves are used to:
A. Regulate pressure
