NFPA 54 Exam Questions and Answers
2025/2026 A+ Graded 100% Verified
NFPA 54 - ANS -National fuel gas code
Color use to identify natural - ANS -yellow
Specific gravity of gas - ANS -0.60 lighter then air
Elevated pressure of gas into a building - ANS -1/2 or 14 water column or greater
Ways to join gas pipe together - ANS -Weld, Threaded, Flared, Cast
Minimum gas piping size concealed - ANS -1/2
Minimum gas size buried - ANS -3/4
Gas pressure test for new pipe - ANS -3psi for 10 min
Gas pressure test for existing pipe - ANS -1 1/2 psi for 10 min
Never test Gas pipe - ANS -oxygen
test gauges calibrated - ANS -1/2 pound increments maximum 5 psi
Depth of a trench for gas - ANS -12 inch depth min, if hazards are found, 18 inches max
1 inch of mercury= - ANS -1/2 pound=
Components of natural gas - ANS -Methan 90%, Propane 5%, ethan 5%
Btu or British Thermal Unit - ANS -Amount of heat required to raise the temp of 1 pound
of water one degree Fahrenheit.
Ratio of air to natural gas for combustion - ANS -10 parts air to 1 part natural gas
In one cubic foot of gas there is - ANS -1,000 Btu's
Wire used under ground for gas - ANS -14 gauge tracer wire
, Distance between gas regulator and point of ignition - ANS -3 ft min
Pitch of gas pipe - ANS -1/4 per 15 ft
Plastic pipe for gas can only be used - ANS -Outside under ground and cannot penetrate
foundation or go under foundation.
Drip T's in gas lines must be placed - ANS -First change of direction after meter and at
any change of direction from horizontal to vertical.
Penetration of gas pipe through floors, patio or slab - ANS -No less then 2 inch of
unthreaded pipe.
All drip Tee's must have at least - ANS -3" between cap and tee.
Changing a chimerical gas stove with an exhaust hood is what must be done. - ANS -A
solenoid valve must be installed and wired to exhaust. If other units are present,
solenoids must be placed upstream of all fixtures.
Gas equipment shall not utilize any combustion air or ventilation air from - ANS
-Bedroom or bath room
Type 1 clothes dryers can be installed in closets in bed rooms or baths only when - ANS
-Combustion and ventilation air is introduced to the space with an air intake equal to or
greater then the size of the exhaust. The combustion and ventilation air must come from
a space that is sized correctly for combustion.
Gas flex hoses installled in industrial appliance - ANS -Shall not exceed 6ft
Direct gas fired Industrial Air Heaters may not be utilized unless manufacturer states that
there is no more then - ANS -50 ppm of carbon monoxide in total volume discharged
from unit
Room heaters shall not be installed - ANS -bathrooms or bed rooms unless they are
direct vented
unvented room heaters permits can not be given until - ANS -A permit is obtained from
fire department
Gas piping systems in excess of one million btu input shall be tested for a maximum of -
ANS -Not more than 24 hours
AWS - ANS -American Welding Society
2025/2026 A+ Graded 100% Verified
NFPA 54 - ANS -National fuel gas code
Color use to identify natural - ANS -yellow
Specific gravity of gas - ANS -0.60 lighter then air
Elevated pressure of gas into a building - ANS -1/2 or 14 water column or greater
Ways to join gas pipe together - ANS -Weld, Threaded, Flared, Cast
Minimum gas piping size concealed - ANS -1/2
Minimum gas size buried - ANS -3/4
Gas pressure test for new pipe - ANS -3psi for 10 min
Gas pressure test for existing pipe - ANS -1 1/2 psi for 10 min
Never test Gas pipe - ANS -oxygen
test gauges calibrated - ANS -1/2 pound increments maximum 5 psi
Depth of a trench for gas - ANS -12 inch depth min, if hazards are found, 18 inches max
1 inch of mercury= - ANS -1/2 pound=
Components of natural gas - ANS -Methan 90%, Propane 5%, ethan 5%
Btu or British Thermal Unit - ANS -Amount of heat required to raise the temp of 1 pound
of water one degree Fahrenheit.
Ratio of air to natural gas for combustion - ANS -10 parts air to 1 part natural gas
In one cubic foot of gas there is - ANS -1,000 Btu's
Wire used under ground for gas - ANS -14 gauge tracer wire
, Distance between gas regulator and point of ignition - ANS -3 ft min
Pitch of gas pipe - ANS -1/4 per 15 ft
Plastic pipe for gas can only be used - ANS -Outside under ground and cannot penetrate
foundation or go under foundation.
Drip T's in gas lines must be placed - ANS -First change of direction after meter and at
any change of direction from horizontal to vertical.
Penetration of gas pipe through floors, patio or slab - ANS -No less then 2 inch of
unthreaded pipe.
All drip Tee's must have at least - ANS -3" between cap and tee.
Changing a chimerical gas stove with an exhaust hood is what must be done. - ANS -A
solenoid valve must be installed and wired to exhaust. If other units are present,
solenoids must be placed upstream of all fixtures.
Gas equipment shall not utilize any combustion air or ventilation air from - ANS
-Bedroom or bath room
Type 1 clothes dryers can be installed in closets in bed rooms or baths only when - ANS
-Combustion and ventilation air is introduced to the space with an air intake equal to or
greater then the size of the exhaust. The combustion and ventilation air must come from
a space that is sized correctly for combustion.
Gas flex hoses installled in industrial appliance - ANS -Shall not exceed 6ft
Direct gas fired Industrial Air Heaters may not be utilized unless manufacturer states that
there is no more then - ANS -50 ppm of carbon monoxide in total volume discharged
from unit
Room heaters shall not be installed - ANS -bathrooms or bed rooms unless they are
direct vented
unvented room heaters permits can not be given until - ANS -A permit is obtained from
fire department
Gas piping systems in excess of one million btu input shall be tested for a maximum of -
ANS -Not more than 24 hours
AWS - ANS -American Welding Society
