National Fuel Gas Code Final Exam set
2025 Latest with Questions and
simplified correct Answers
What does NFPA stand for? - correct answer- ✅National Fire Protection Association
NFPA 54 is a safety code? - correct answer- ✅Yes
Coverage in this code NFPA 54 shall extend from _______ to ___________. - correct answer- ✅the point
of delivery to the appliance?
The max operating pressure of piping systems covered under this code shall be ________. - correct
answer- ✅125 psig.
ASME stands for _________. - correct answer- ✅American Society of Mechanical Engineers.
ASTM stands for _____. - correct answer- ✅American Society for Testing Materials.
MSS stands for __________. - correct answer- ✅Manufacturing Society for Standardization of the Valve
and Fitting Industry.
MSS SP-58 is the title of a publication, published by the Manufacturers Standardization Society of the
Valve and Fitting Industry, entitled _________. - correct answer- ✅Pipe Hangers and Supports--
Materials, Design and Manufacture.
UL stands for ______. - correct answer- ✅Underwriters Laboratories Inc.
NFPA 70 is the _______. - correct answer- ✅National Electric Code.
Approved - correct answer- ✅Acceptable to the Authority having jurisdiction.
Authority having Jurisdiction - correct answer- ✅An Organization, office or individual responsible for
enforcing the requirements of a code or standard, or for approving equipment, materials, and
installation or procedure.
Listed - correct answer- ✅Equiptment, materials or services included in a list published and approved by
an organization that is acceptable to the authority having jurisdiction.
Venting System - correct answer- ✅A continuous open passageway from the flue collar or draft hood of
an appliance to the outdoors for the purpose of removing flue or vent gases.
A column of water 100' high will exert ____ psig at it's base. - correct answer- ✅43.4
A piping offset of 12" will have a travel of _____. - correct answer- ✅17"
A cylindrical tank with a diameter of 4' which is 5' long contains how many cubic feet? - correct answer-
✅62.8 cu. ft
(diameter squared times .785 times height)
1 inch equals how many millimeters? - correct answer- ✅25.4
water weighs ______ lbs. - correct answer- ✅8.33
The UA was founded in what year? - correct answer- ✅1889.
UA local 5 received its' charter in what year? - correct answer- ✅1890.
Define a Journeyman Gasfitter. - correct answer- ✅A Journeyman Gasfitter is a trained, competent,
individual able to design, install, test and trouble shoot gas systems and appliances.
Labeled - correct answer- ✅indicates compliance with appropriate standards or performance in a
specified manner.
Shall - correct answer- ✅indicates a mandatory requirement.
Air for cooling, heating, or ventilation distribued to habitable spaces is ______. - correct answer-
✅Circulating Air.
Air that enters a draft hood or draft regulator and mixes with the flue gases is ______. - correct answer-
✅Dilution Air.
, Hot Water Heating Boiler - correct answer- ✅A boiler designed to heat water for circulation through an
external space heating system.
BTU - correct answer- ✅British Thermal Unit. The quantity of heat required to raise the temperature of
1 lb of water 1 degree Fahrenheit.
Draft - correct answer- ✅A pressure difference that causes gases or air to flow through a chimney, vent,
flue or appliance.
Heating Value - correct answer- ✅The # of BTU's produced by combustion
What is the heating value of Natural gas? - correct answer- ✅1000 BTU/cf
What is the heating value of propane? - correct answer- ✅2500 BTU/cf
What is the heating value of Butane - correct answer- ✅3250 BTU/cf
What is the specific gravity of Natural Gas? - correct answer- ✅.60
What is the specific gravity of Propane? - correct answer- ✅1.50
What is the specific gravity of Butane? - correct answer- ✅2.0
Atmospheric Pressure - correct answer- ✅The pressure of the weight of air on the surface of the earth,
approximately 14.7 psi at sea level.
Purge - correct answer- ✅To free a gas conduit of air or gas, or mixture of both.
Line Pressure Regulator - correct answer- ✅A pressure regulator placed in a gas line between the
service regulator and the appliance regulator where gas supply pressure is higher than the branch supply
line or appliance are designed.
Mechanical Exhaust System - correct answer- ✅Equiptment installed in and made part of the vent, to
provide required flow of gases through vent.
Vent Connector - correct answer- ✅The pipe or duct that connects a fuel-gas burning appliance to a
vent or chimney.
Where repairs or additions are made to the piping system following a pressure test, ___________ shall
be tested - correct answer- ✅the affected piping
where new branches are installed to new appliances, only the _______________ shall be required to be
pressure tested. - correct answer- ✅newly installed branches
Under no circumstances shall a ____ in a line be used as a bulkhead between gas in one section of the
piping system and a test medium in an adjacent section. - correct answer- ✅valve
The test medium of gas piping systems shall be ______,_______, or ________. Oxygen shall never be
used. - correct answer- ✅air, nitrogen or carbon dioxide
appliances and equipment that are not to be included in the test shall be ________. - correct answer-
✅either disconnected from the piping or isolated by blanks, blind flanges or caps.
Mechanical gauges used to measure test pressures shall have a range such that the highest end of the
scale is not greater than ___ times the test pressure. - correct answer- ✅5
The test pressure to be used shall be no less than ____ times the proposed maximum working pressure,
but not less than ___ psi. - correct answer- ✅1 1/2 ; 3
test duration shall be not less than ___ hour for each ____ ft of pipe. - correct answer- ✅1/2; 500
for a system having a volume less than 10' or a system in a single family dwelling, the test duration shall
be a minimum of ___ minutes and not exceed ____ hrs. - correct answer- ✅10; 24
leakage shall be located by a ________ leak detection fluid, gas detector or other approved leak
detection method. - correct answer- ✅noncorrosive
before gas is introduced into a system of new gas piping, the entire system shall be inspected to
determine that there are no _____or_____ and that all _____ are closed and plugged or capped. -
correct answer- ✅open fittings or ends; valves
The open end of piping systems being purged of gas shall not discharge into ________ or areas where
there are sources of ________. - correct answer- ✅confined spaces; ignition
2025 Latest with Questions and
simplified correct Answers
What does NFPA stand for? - correct answer- ✅National Fire Protection Association
NFPA 54 is a safety code? - correct answer- ✅Yes
Coverage in this code NFPA 54 shall extend from _______ to ___________. - correct answer- ✅the point
of delivery to the appliance?
The max operating pressure of piping systems covered under this code shall be ________. - correct
answer- ✅125 psig.
ASME stands for _________. - correct answer- ✅American Society of Mechanical Engineers.
ASTM stands for _____. - correct answer- ✅American Society for Testing Materials.
MSS stands for __________. - correct answer- ✅Manufacturing Society for Standardization of the Valve
and Fitting Industry.
MSS SP-58 is the title of a publication, published by the Manufacturers Standardization Society of the
Valve and Fitting Industry, entitled _________. - correct answer- ✅Pipe Hangers and Supports--
Materials, Design and Manufacture.
UL stands for ______. - correct answer- ✅Underwriters Laboratories Inc.
NFPA 70 is the _______. - correct answer- ✅National Electric Code.
Approved - correct answer- ✅Acceptable to the Authority having jurisdiction.
Authority having Jurisdiction - correct answer- ✅An Organization, office or individual responsible for
enforcing the requirements of a code or standard, or for approving equipment, materials, and
installation or procedure.
Listed - correct answer- ✅Equiptment, materials or services included in a list published and approved by
an organization that is acceptable to the authority having jurisdiction.
Venting System - correct answer- ✅A continuous open passageway from the flue collar or draft hood of
an appliance to the outdoors for the purpose of removing flue or vent gases.
A column of water 100' high will exert ____ psig at it's base. - correct answer- ✅43.4
A piping offset of 12" will have a travel of _____. - correct answer- ✅17"
A cylindrical tank with a diameter of 4' which is 5' long contains how many cubic feet? - correct answer-
✅62.8 cu. ft
(diameter squared times .785 times height)
1 inch equals how many millimeters? - correct answer- ✅25.4
water weighs ______ lbs. - correct answer- ✅8.33
The UA was founded in what year? - correct answer- ✅1889.
UA local 5 received its' charter in what year? - correct answer- ✅1890.
Define a Journeyman Gasfitter. - correct answer- ✅A Journeyman Gasfitter is a trained, competent,
individual able to design, install, test and trouble shoot gas systems and appliances.
Labeled - correct answer- ✅indicates compliance with appropriate standards or performance in a
specified manner.
Shall - correct answer- ✅indicates a mandatory requirement.
Air for cooling, heating, or ventilation distribued to habitable spaces is ______. - correct answer-
✅Circulating Air.
Air that enters a draft hood or draft regulator and mixes with the flue gases is ______. - correct answer-
✅Dilution Air.
, Hot Water Heating Boiler - correct answer- ✅A boiler designed to heat water for circulation through an
external space heating system.
BTU - correct answer- ✅British Thermal Unit. The quantity of heat required to raise the temperature of
1 lb of water 1 degree Fahrenheit.
Draft - correct answer- ✅A pressure difference that causes gases or air to flow through a chimney, vent,
flue or appliance.
Heating Value - correct answer- ✅The # of BTU's produced by combustion
What is the heating value of Natural gas? - correct answer- ✅1000 BTU/cf
What is the heating value of propane? - correct answer- ✅2500 BTU/cf
What is the heating value of Butane - correct answer- ✅3250 BTU/cf
What is the specific gravity of Natural Gas? - correct answer- ✅.60
What is the specific gravity of Propane? - correct answer- ✅1.50
What is the specific gravity of Butane? - correct answer- ✅2.0
Atmospheric Pressure - correct answer- ✅The pressure of the weight of air on the surface of the earth,
approximately 14.7 psi at sea level.
Purge - correct answer- ✅To free a gas conduit of air or gas, or mixture of both.
Line Pressure Regulator - correct answer- ✅A pressure regulator placed in a gas line between the
service regulator and the appliance regulator where gas supply pressure is higher than the branch supply
line or appliance are designed.
Mechanical Exhaust System - correct answer- ✅Equiptment installed in and made part of the vent, to
provide required flow of gases through vent.
Vent Connector - correct answer- ✅The pipe or duct that connects a fuel-gas burning appliance to a
vent or chimney.
Where repairs or additions are made to the piping system following a pressure test, ___________ shall
be tested - correct answer- ✅the affected piping
where new branches are installed to new appliances, only the _______________ shall be required to be
pressure tested. - correct answer- ✅newly installed branches
Under no circumstances shall a ____ in a line be used as a bulkhead between gas in one section of the
piping system and a test medium in an adjacent section. - correct answer- ✅valve
The test medium of gas piping systems shall be ______,_______, or ________. Oxygen shall never be
used. - correct answer- ✅air, nitrogen or carbon dioxide
appliances and equipment that are not to be included in the test shall be ________. - correct answer-
✅either disconnected from the piping or isolated by blanks, blind flanges or caps.
Mechanical gauges used to measure test pressures shall have a range such that the highest end of the
scale is not greater than ___ times the test pressure. - correct answer- ✅5
The test pressure to be used shall be no less than ____ times the proposed maximum working pressure,
but not less than ___ psi. - correct answer- ✅1 1/2 ; 3
test duration shall be not less than ___ hour for each ____ ft of pipe. - correct answer- ✅1/2; 500
for a system having a volume less than 10' or a system in a single family dwelling, the test duration shall
be a minimum of ___ minutes and not exceed ____ hrs. - correct answer- ✅10; 24
leakage shall be located by a ________ leak detection fluid, gas detector or other approved leak
detection method. - correct answer- ✅noncorrosive
before gas is introduced into a system of new gas piping, the entire system shall be inspected to
determine that there are no _____or_____ and that all _____ are closed and plugged or capped. -
correct answer- ✅open fittings or ends; valves
The open end of piping systems being purged of gas shall not discharge into ________ or areas where
there are sources of ________. - correct answer- ✅confined spaces; ignition
