NYC GAS CODE EXAM QUESTIONS AND ANSWERS
Where is the union located for a gas appliance? - CORRECT 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.
Where is gas piping permitted? - CORRECT 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.
How much must piping for other than dry gas conditions be sloped? - CORRECT ANSWER✅✅Not less
the 1/4 inch in 15 feet to prevent traps.
Hanger spacing for 3/4 inch and 1 inch gas pipe - CORRECT ANSWER✅✅8 feet
When is water permitted for testing? - CORRECT ANSWER✅✅Fresh water may be used the test
medium where the required test pressure exceeds 100 p.s.i.g.
When do need temporary restraints when testing? - CORRECT ANSWER✅✅Expansion joints shall be
provided with temporary restraints, if required, for the additional trust load under test.
What must each digital gauge used to measure pressure in the magnitude of 3 and higher read? -
CORRECT ANSWER✅✅The gauge shall have a minimum reading of 1/100 of a p.s.i.g.
Where pipe passes through an outside wall, this piping shall not be less than how many inches outside
of the buildings? - CORRECT 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.
, Threaded pipe may be used up to 4 inches at pressure no greater than? - CORRECT ANSWER✅✅1/2
p.s.i.g.
Gas piping going through the foundation wall of a building, shall be protected by? - CORRECT
ANSWER✅✅Encasing it in a protective sleeve.
Gas piping in solid floor shall be installed in a conduit of schedule 40 pipe. This conduit shall extend not
less than how many inches above the floor? - CORRECT ANSWER✅✅2 inches.
All exterior gas piping shall be elevated not less than how many inches above ground and roof surfaces?
- CORRECT ANSWER✅✅3 1/2 inches.
The untreated portion of gas piping outlets must extend at least how many inch through finished
ceilings and walls? - CORRECT ANSWER✅✅1 inch
Underground piping systems shall be installed a minimum depth of, how many inches below grade? -
CORRECT ANSWER✅✅24 inches
The unthreatened portion of gas piping outlets extending through floors or outdoor patios and slabs
must extend at least, how many inches above them? - CORRECT ANSWER✅✅2 inches
What gas is prohibited from being used for testing gas piping? - CORRECT ANSWER✅✅Oxygen
The testing duration for gas piping with distribution pressures over 1/2 p.s.I.g through 5 p.s.I.g is? -
CORRECT ANSWER✅✅50 p.s.I.g for a minimum of 30 minutes.
Supports for 1 inch gas piping shall be spaced no more than, how many feet apart? - CORRECT
ANSWER✅✅8 feet
The gas shut off valve shall be within how many feet of the appliance? - CORRECT ANSWER✅✅6 feet
Where is the union located for a gas appliance? - CORRECT 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.
Where is gas piping permitted? - CORRECT 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.
How much must piping for other than dry gas conditions be sloped? - CORRECT ANSWER✅✅Not less
the 1/4 inch in 15 feet to prevent traps.
Hanger spacing for 3/4 inch and 1 inch gas pipe - CORRECT ANSWER✅✅8 feet
When is water permitted for testing? - CORRECT ANSWER✅✅Fresh water may be used the test
medium where the required test pressure exceeds 100 p.s.i.g.
When do need temporary restraints when testing? - CORRECT ANSWER✅✅Expansion joints shall be
provided with temporary restraints, if required, for the additional trust load under test.
What must each digital gauge used to measure pressure in the magnitude of 3 and higher read? -
CORRECT ANSWER✅✅The gauge shall have a minimum reading of 1/100 of a p.s.i.g.
Where pipe passes through an outside wall, this piping shall not be less than how many inches outside
of the buildings? - CORRECT 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.
, Threaded pipe may be used up to 4 inches at pressure no greater than? - CORRECT ANSWER✅✅1/2
p.s.i.g.
Gas piping going through the foundation wall of a building, shall be protected by? - CORRECT
ANSWER✅✅Encasing it in a protective sleeve.
Gas piping in solid floor shall be installed in a conduit of schedule 40 pipe. This conduit shall extend not
less than how many inches above the floor? - CORRECT ANSWER✅✅2 inches.
All exterior gas piping shall be elevated not less than how many inches above ground and roof surfaces?
- CORRECT ANSWER✅✅3 1/2 inches.
The untreated portion of gas piping outlets must extend at least how many inch through finished
ceilings and walls? - CORRECT ANSWER✅✅1 inch
Underground piping systems shall be installed a minimum depth of, how many inches below grade? -
CORRECT ANSWER✅✅24 inches
The unthreatened portion of gas piping outlets extending through floors or outdoor patios and slabs
must extend at least, how many inches above them? - CORRECT ANSWER✅✅2 inches
What gas is prohibited from being used for testing gas piping? - CORRECT ANSWER✅✅Oxygen
The testing duration for gas piping with distribution pressures over 1/2 p.s.I.g through 5 p.s.I.g is? -
CORRECT ANSWER✅✅50 p.s.I.g for a minimum of 30 minutes.
Supports for 1 inch gas piping shall be spaced no more than, how many feet apart? - CORRECT
ANSWER✅✅8 feet
The gas shut off valve shall be within how many feet of the appliance? - CORRECT ANSWER✅✅6 feet
