Page 604 - 2018_IRC

FUEL GAS

G2415.10 (404.10) Isolation. Metallic piping and metallic listed for installation beneath buildings, or other approved
tubing that conveys fuel gas from an LP-gas storage container conduit material designed to withstand the superimposed
shall be provided with an approved dielectric fitting to elec- loads. The conduit shall be protected from corrosion in accor-
trically isolate the underground portion of the pipe or tube dance with Section G2415.11 and shall be installed in accor-
from the above-ground portion that enters a building. Such dance with Section G2415.14.1 or G2415.14.2.
dielectric fitting shall be installed above ground, outdoors. G2415.14.1 (404.14.1) Conduit with one end terminat-
G2415.11 (404.11) Protection against corrosion. Steel pipe ing outdoors. The conduit shall extend into an occupiable
or tubing exposed to corrosive action, such as soil condition portion of the building and, at the point where the conduit
or moisture, shall be protected in accordance with Sections terminates in the building, the space between the conduit
G2415.11.1 through G2415.11.5. and the gas piping shall be sealed to prevent the possible
G2415.11.1 (404.11.1) Galvanizing. Zinc coating shall entrance of any gas leakage. The conduit shall extend not
not be deemed adequate protection for underground gas less than 2 inches (51 mm) beyond the point where the
piping. pipe emerges from the floor. Where the end sealing is
capable of withstanding the full pressure of the gas pipe,
G2415.11.2 (404.11.2) Protection methods. Under- the conduit shall be designed for the same pressure as the
ground piping shall comply with one or more of the fol- pipe. Such conduit shall extend not less than 4 inches (102
lowing: mm) outside the building, shall be vented above grade to
1. The piping shall be made of corrosion-resistant the outdoors and shall be installed so as to prevent the
material that is suitable for the environment in entrance of water and insects.
which it will be installed. G2415.14.2 (404.14.2) Conduit with both ends termi-
2. Pipe shall have a factory-applied, electrically-insu- nating indoors. Where the conduit originates and termi-
lating coating. Fittings and joints between sections nates within the same building, the conduit shall originate
of coated pipe shall be coated in accordance with the and terminate in an accessible portion of the building and
coating manufacturer’s instructions. shall not be sealed. The conduit shall extend not less than
2 inches (51 mm) beyond the point where the pipe
3. The piping shall have a cathodic protection system emerges from the floor.
installed and the system shall be monitored and
maintained in accordance with an approved pro- G2415.15 (404.15) Outlet closures. Gas outlets that do not
gram. connect to appliances shall be capped gas tight.
G2415.11.3 (404.11.3) Dissimilar metals. Where dissimi- Exception: Listed and labeled flush-mounted-type quick-
lar metals are joined underground, an insulating coupling disconnect devices and listed and labeled gas convenience
or fitting shall be used. outlets shall be installed in accordance with the manufac-
turer’s instructions.
G2415.11.4 (404.11.4) Protection of risers. Steel risers
connected to plastic piping shall be cathodically protected G2415.16 (404.16) Location of outlets. The unthreaded por-
by means of a welded anode, except where such risers are tion of piping outlets shall extend not less than l inch (25 mm)
anodeless risers. through finished ceilings and walls and where extending
through floors or outdoor patios and slabs, shall be not less
G2415.11.5 (404.11.5) Prohibited use. Uncoated
threaded or socket-welded joints shall not be used in pip- than 2 inches (51 mm) above them. The outlet fitting or pip-
ing shall be securely supported. Outlets shall not be placed
ing in contact with soil or where internal or external crev- behind doors. Outlets shall be located in the room or space
ice corrosion is known to occur.
where the appliance is installed.
G2415.12 (404.12) Minimum burial depth. Underground
piping systems shall be installed a minimum depth of 12 Exception: Listed and labeled flush-mounted-type quick-
inches (305 mm) below grade, except as provided for in Sec- disconnect devices and listed and labeled gas convenience
tion G2415.12.1. outlets shall be installed in accordance with the manufac-
turer’s instructions.
G2415.12.1 (404.12.1) Individual outdoor appliances. G2415.17 (404.17) Plastic pipe. The installation of plastic
Individual lines to outdoor lights, grills and other appli- pipe shall comply with Sections G2415.17.1 through
ances shall be installed not less than 8 inches (203 mm)
below finished grade, provided that such installation is G2415.17.3.
approved and is installed in locations not susceptible to G2415.17.1 (404.17.1) Limitations. Plastic pipe shall be
physical damage. installed outdoors underground only. Plastic pipe shall not
be used within or under any building or slab or be operated
G2415.13 (404.13) Trenches. The trench shall be graded so
that the pipe has a firm, substantially continuous bearing on at pressures greater than 100 psig (689 kPa) for natural gas
the bottom of the trench. or 30 psig (207 kPa) for LP-gas.
Exceptions:
G2415.14 (404.14) Piping underground beneath buildings.
Piping installed underground beneath buildings is prohibited 1. Plastic pipe shall be permitted to terminate above
except where the piping is encased in a conduit of wrought ground outside of buildings where installed in
iron, plastic pipe, steel pipe, a piping or encasement system premanufactured anodeless risers or service head

2018 INTERNATIONAL RESIDENTIAL CODE ® 579
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