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NYC Fuel Gas Code Exam 2026/ 2027 Update –
100 Verified Questions and Answers for
Guaranteed Pass
NYC Fuel Gas Code Exam
2026 / 2027 Ac
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ademic Year
Q: Where is the union located for a gas appliance?
Answer:
A union fitting shall be provided for appliance connected by rigid metallic pipe. Such unions
shall be accessible and located within 6 feet of the appliance.
Q: Where is gas piping permitted?
Answer:
Gas piping may be installed in public corridors in residential buildings that do not have floors
below grade or in multi use buildings that have a residential occupancy in accordance with the
following, Gas piping shall be permitted to be installed within a public corridor at the lowest
level of the building or the lowest residential level of the building. All gas valves located within
the public corridor shall be accessible for maintenance and inspection. Gas pressure within the
public corridor piping shall not exceed 1/2 psi. The completed piping within the public corridor
is to be tested and proven tight at 10 psig for a minimum of 30 minutes. The public corridor
shall be ventilated in accordance with the New York City Mechanical Code. The pipe shall not be
installed in a return air plenum. Pipes must be welded.
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Q: How much must piping for other than dry gas conditions be sloped?
Answer:
Not less the 1/4 inch in 15 feet to prevent traps.
Q: Hanger spacing for 3/4 inch and 1 inch gas pipe
Answer:
8 feet
Q: When is water permitted for testing?
Answer:
Fresh water may be used the test medium where the required test pressure exceeds 100 p.s.i.g.
Q: When do need temporary restraints when testing?
Answer:
Expansion joints shall be provided with temporary restraints, if required, for the additional trust
load under test.
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Q: What must each digital gauge used to measure pressure in the magnitude of 3 and higher
read?
Answer:
The gauge shall have a minimum reading of 1/100 of a p.s.i.g.
Q: Where pipe passes through an outside wall, this piping shall not be less than how many
inches outside of the buildings?
Answer:
With conduit going through the wall, pipe shall not be less than 4 inches outside the building
and sleeve shall be at least 1 inch beyond the inner side of the wall. Pipe shall be vented above
grade to the outdoors and shall be installed so as to prevent the entrance of water and insects.
Q: Threaded pipe may be used up to 4 inches at pressure no greater than?
Answer:
1/2 p.s.i.g.
Q: Gas piping going through the foundation wall of a building, shall be protected by?
Answer:
Encasing it in a protective sleeve.
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Q: Gas piping in solid floor shall be installed in a conduit of schedule 40 pipe. This conduit
Answer:
shall extend not less than how many inches above the floor?
2 inches.
Q: All exterior gas piping shall be elevated not less than how many inches above ground and
roof surfaces?
Answer:
3 1/2 inches.
Q: The untreated portion of gas piping outlets must extend at least how many inch through
finished ceilings and walls?
Answer:
1 inch
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Q: Underground piping systems shall be installed a minimum depth of, how many inches
below grade?
Answer:
24 inches
Q: The unthreatened portion of gas piping outlets extending through floors or outdoor patios
and slabs must extend at least, how many inches above them?
Answer:
2 inches
Q: What gas is prohibited from being used for testing gas piping?
Answer:
Oxygen
Q: The testing duration for gas piping with distribution pressures over 1/2 p.s.I.g through 5
p.s.I.g is?
Answer:
50 p.s.I.g for a minimum of 30 minutes.
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Q: Supports for 1 inch gas piping shall be spaced no more than, how many feet apart?
Answer:
8 feet
Q: The gas shut off valve shall be within how many feet of the appliance?
Answer:
6 feet
Q: Located on the supply side of the meter, every meter shall be equipped with a what?
Answer:
Shut off valve
Q: Gas distribution piping with pressures up to 1/2 p.s.I.g, shall be tested at a pressure of how
many P.s.I.g?, and a minimum of how many minutes?
Answer:
3 p.s.I.g for 30 minutes
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Q: What joints is acceptable in gas piping?
Answer:
Threaded, flanged and welded
Q: Gas meters and service piping is found in what part of the F.G.C?
Answer:
Appendix E
Q: What is the final step before you restore gas service after a shutdown?
Answer:
The gas utility company shall be notified by owner or his or her authorized representative.
Q: All factory applied coated and wrapped pipe shall be pressure tested at a minimum of what
p.s.I.g?
Answer:
90 p.s.ig.
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The holder of the plumbing permit shall give how many days prior written notice for inspection?
Answer:
2 days
Gas leak detection methods include?
Answer:
An approved gas detector, a noncorrosive leak detection fluid and other approved leak detection
methods.
The shutoff valve for appliances shall be located?
Answer:
In the same room as the appliance.
True or false. Where the shutoff valve is located in the firebox a remote shutoff valve shall also
be provided.
Answer:
True.
Supports for 1/2 inch gas piping shall be spaced no more than how many feet apart?
Answer:
6 feet
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Supports for 1 1/4 inch gas piping shall be spaced no more that how many feet apart?
12 feet
What color is carbon monoxide?
Has no color
Is natural gas lighter than air?
Yes
What are the 2 important components of natural gas?
Methane and ethane
Is today natural gas toxic?
No
The specific gravity of natural gas is between what ranges?
0.60 to 0.85
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At what temperature will natural gas ignite?
Between 1100 to 1200 degrees
The flammable range for natural gas and explosive limits are between?
5% to 15%
What condition is found when you have a yellow flame?
Incomplete combustion
What condition if found when you have an orange flame?
Dust particles
What is "CO" also known as?
Silent killer
What is added to natural gas to give it an odor?
Mercaptan
How must each meter inside a building be installed?
In a readily accessible location and be protected from corrosion.
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How many threads are on a half inch to one inch pipe?
Approximately 10 threads.
How many threads are on a one and a quarter inch to two inch pipe?
Approximately 11 threads.
How many threads are on a two and half inch to three inch pipe?
Approximately 12 threads.
How many threads are on a four inch pipe?
Approximately 13 threads.
What agency exercise jurisdiction over actions that gasfitters must follow?
N.y.c. Department of buildings
Where must the vent from a service regulator terminate?
Outdoors, at least 18" from the openings to the building
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Department of transportation jurisdiction ends?
At the property line
What does N.Y.C fuel gas code calls the outlet of the inside meter assembly.
The point of delivery.
Service piping is defined as?
Piping upstream of the point of delivery.
The specifications for inside meter assemblies for buildings that receive natural gas from con Ed
are found in what book?
Yellow book
The specifications for inside meter assemblies for buildings that receive natural gas from
National Grid are found in what book?
Blue book
On a job where a full gas work qualified journeyman is present, which other employee does his
gas work qualification allow to do gas work?
Only a limited gas work qualified employee under his personal and immediate supervision
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How long is the limited gas work qualification valid?
5 years and it cannot be renewed
According to the definition given by the N.Y.C.F.G.C, vertical piping supplying fuel gas is known
as?
Gas riser
Gas system that operates at pressures above 2 p.s.I.g. Must be purged where? When being
energized.
Outdoors
What device must be used to determine whether the purge is complete?
Combustible gas indicator.
Gas piping system must be purged to the outdoors when the nominal pipe size is ?
8" or larger
Fittings used with steel or wrought-iron pipe shall be?
Steel or malleable iron
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When joining a 150# steel flange to a class 125 cast-iron flange, the raised face of the steel flange
shall be?
Removed
Material for flange gaskets shall be capable of withstanding
The design temperature/ pressure of the piping system, the chemical constituents of the gas
being conducted and the effects of fire exposure on the joint
Materials for flange gaskets shall be
Metal, nonasbestos fibers, aluminum O-rings and spiral-wound metal
When the flange joint is open
The gasket must be replaced
With cast-iron flange only what must be used?
Full face gasket
Piping shall not be installed in or through
Circulation air duct, trash chute, clothes chute, chimney, gas vent, ventilating duct, dumb waiter
and elevator shaft.
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Downstream piping in one townhouse unit shall not
Be up stream piping for a second townhouse
Stair enclosure or require exit way, shaft containing standpipe risers and fire pump housing
shall not
Have gas lines, devices/ equipments and or be used as access to a meter room.
Gas pipe shall not be installed in in public corridors nor exit enclosures, except?
Residential/ multiuse-residential buildings with no floors below grade. Pipe shall be installed at
the lowest level with accessible corridor valves, the max pressure must be 1/2 psi. Pipe must be
tested at 10 psi for 30 minutes, be welded and corridor ventilated as per the mechanical code.
Concealed gas piping shall not be located in solid partitions/ walls, unless?
Installed in a ventilated chase/ casing and pipe must not have unions, compression couplings
and swing joints.
Piping in solid floors shall be
Laid in channels, covered to allow access to with minimal damage and suitably protected from
moisture and corrosive substances. Or be installed in schedule 40 steel or wrought-iron pipe
conduit with tightly sealed ends and joints, both end extending not less than 2 inches above
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floor and vented at least 18 inches above grade on one side.
For underground piping, galvanize pipe is?
Not suitable protection
Gas pipe buried in conduit must be sealed to prevent the entrance of gas leak, and the conduit
must be?
Design for the same pressure as the gas pipe.
Gas pipe conduit terminating outside the building shall be?
A minimum of 4 inches extended and be vented at least 18 inches above grade outside of the
building .
Gas outlet that do not connect to appliances/ future-laboratory shall be capped tight, except for?
Listed/ labeled, flush-mounted, quick-disconnect devices and gas convenience-outlet.
Unthread portion gas piping outlets shall be extended at least
1 inch beyond finished walls and ceilings and 2 inches above floors, outdoor patios, and slabs
Non-destructive gas pipe inspection shall include?
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Magnetic-particle, radiographic and ultrasonic if required.
Testing mediums shall be?
Air, nitrogen, carbon dioxide, or inert gas.
Water may be use as testing medium when?
Testing pressures exceed 100 psi
Gas distribution up to 1/2 psi shall be tested?
3 psi for 30 minutes
Gas distribution 1/2 psi to 5 psi shall be tested?
50 psi for 30 minutes
Gas distribution 5 psi to 15 psi shall be tested?
100 psi for 1 hour
Coated and wrapped gas pipe shall be tested?
No less than 90 psi, fresh water may be used for test pressure over 100 psi
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What is the scope of the NYC Fuel Gas Code?
The code regulates the design, installation, maintenance, alteration, and inspection of fuel gas
systems, including gas piping, gas appliances, and related accessories within the jurisdiction of
NYC.
Define "Gas Piping."
Gas Piping refers to all piping used to convey fuel gas, including fittings, valves, and devices for
controlling the gas flow.
What materials are allowed for gas piping installations?
Allowed materials include steel, wrought iron, copper, and CSST (Corrugated Stainless Steel
Tubing) as per code specifications.
What are the requirements for venting gas appliances?
Venting requirements include proper sizing, materials, installation methods, and termination
locations to ensure safe removal of combustion gases.
What is required for the inspection of gas piping systems?
Inspections must verify proper installation, materials, pressure testing, and compliance with the
code before systems are put into operation.
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Describe the process of purging a gas line.
Purging involves removing air from the gas piping system to ensure the safe and effective
operation of gas appliances. This is typically done with an inert gas.
What is a "Category I" appliance? A
A Category I appliance is one that operates with a non-positive vent pressure and a flue loss of
less than 17%.
What safety measures must be in place for gas appliance installations?
Safety measures include proper venting, clearance from combustible materials, use of approved
materials and devices, and adherence to manufacturer instructions.
What is the maximum allowable pressure drop in a gas piping system?
The maximum allowable pressure drop in a gas piping system is 0.5 inches water column for
low-pressure systems.
What are the clearance requirements for gas vents?
Gas vents must maintain a minimum clearance of 6 inches from combustible materials unless
the appliance manufacturer's instructions specify otherwise.
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Define "Shutoff Valve" in the context of gas piping.
A shutoff valve is a valve that can be closed to stop the flow of gas in the piping system, used for
safety and maintenance purposes.
What is the significance of a gas meter location?
The gas meter location must be easily accessible for reading and maintenance, protected from
damage, and compliant with venting and clearance requirements.
What are "Combustion Air" requirements? A
Combustion air requirements ensure that sufficient air is available for the complete combustion
of gas, preventing the production of carbon monoxide and other hazardous conditions.
What are the testing requirements for newly installed gas piping?
Newly installed gas piping must be pressure tested at a minimum of 1.5 times the operating
pressure but not less than 3 psig for at least 10 minutes.
Describe the term "CSST."
CSST (Corrugated Stainless Steel Tubing) is a flexible gas piping material that is easy to install
and used for distributing natural gas and propane inside buildings.
What is a "Flue"?
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A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a gas appliance
to the outside atmosphere.
What are the requirements for gas appliance shutoff valves?
Shutoff valves must be installed within 6 feet of the appliance and in the same room as the
appliance. They must be accessible and capable of being operated without special tools.
Define "Regulator" in a gas piping system.
A regulator is a device that controls the pressure of the gas entering the system or appliance,
ensuring it remains within safe operating limits.
What is the purpose of a drip leg in a gas piping system?
A drip leg is installed at the low points of a gas piping system to collect and remove any
condensate or debris from the gas stream.
What is a "Category II" appliance?
A Category II appliance operates with a non-positive vent pressure and a flue loss of 17% or
more.
What are the spacing requirements for gas piping supports?
Gas piping must be supported at intervals of 4 feet for pipe sizes 1 inch or smaller, and 6 feet for
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larger pipes, with additional supports near fittings and appliances.
Define "Appliance Connector." A
An appliance connector is a flexible connector used to connect a gas appliance to the gas piping
system. It allows for easy disconnection and reconnection during maintenance.
What is the purpose of a gas appliance regulator vent?
The regulator vent allows excess gas pressure to be safely released to the atmosphere, preventing
over-pressurization of the appliance.
What is the required clearance for gas vents from building openings?
Gas vents must terminate at least 4 feet below, 4 feet horizontally from, or 1 foot above any
building openings such as windows and doors.
What are the requirements for underground gas piping?
Underground gas piping must be installed with approved materials, have a minimum cover of 12
inches, and be protected from corrosion.
Define "Seismic Shutoff Valve."
A seismic shutoff valve is a valve that automatically shuts off the gas flow in the event of an
earthquake, reducing the risk of gas leaks and fires.
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What are the requirements for venting multiple gas appliances?
When venting multiple appliances, each appliance must be vented according to its specific
requirements, and the combined vent system must be properly sized and installed to handle the
total vent load.
What are the requirements for gas piping systems in high-rise buildings?
High-rise buildings must have gas piping systems designed and installed to withstand building
movement, with provisions for expansion and contraction.
Define "Manifold" in a gas piping system.
A manifold is a pipe or chamber branching into several openings, used to distribute gas to
multiple appliances or locations from a single supply source.
What is the required clearance for gas appliance combustion air openings?
Combustion air openings must be located at least 6 inches above the floor and be sized
according to the appliance manufacturer's specifications and the code requirements.
What are the labeling requirements for gas piping systems?
Gas piping systems must be labeled with the type of gas being conveyed, the operating pressure,
and the date of installation. Labels must be placed at intervals along the piping and near
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appliances.
What is a "Category III" appliance?
A Category III appliance operates with a positive vent pressure and has a flue loss of less than
17%.
Define "Emergency Control Valve."
An emergency control valve is a valve installed in a gas piping system to quickly shut off the gas
flow in case of an emergency, such as a gas leak or fire.
What are the requirements for gas appliance connectors in mobile homes?
Gas appliance connectors in mobile homes must be listed and labeled for use with mobile
homes, be installed according to manufacturer instructions, and be protected from physical
damage.
What is a "Category IV" appliance?
A Category IV appliance operates with a positive vent pressure and has a flue loss of 17% or
more.
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