Page 86 - 2018_IFGC

GAS PIPING INSTALLATIONS

where the piping is encased in a conduit of wrought iron, adapter risers that are installed in accordance
plastic pipe, steel pipe, a piping or encasement system listed with the manufacturer’s instructions.
for installation beneath buildings, or other approved conduit 2. Plastic pipe shall be permitted to terminate with a
material designed to withstand the superimposed loads. The wall head adapter within buildings where the
conduit shall be protected from corrosion in accordance with plastic pipe is inserted in a piping material for
Section 404.11 and shall be installed in accordance with Sec- fuel gas use in buildings.
tion 404.14.1 or 404.14.2.
3. Plastic pipe shall be permitted under outdoor
404.14.1 Conduit with one end terminating outdoors. patio, walkway and driveway slabs provided that
The conduit shall extend into an occupiable portion of the the burial depth complies with Section 404.12.
building and, at the point where the conduit terminates in
the building, the space between the conduit and the gas 404.17.2 Connections. Connections made outdoors and
piping shall be sealed to prevent the possible entrance of underground between metallic and plastic piping shall be
any gas leakage. The conduit shall extend not less than 2 made only with transition fittings conforming to ASTM
inches (51 mm) beyond the point where the pipe emerges D2513 Category I or ASTM F1973.
from the floor. Where the end sealing is capable of with- 404.17.3 Tracer. A yellow insulated copper tracer wire or
standing the full pressure of the gas pipe, the conduit shall other approved conductor, or a product specifically
be designed for the same pressure as the pipe. Such con- designed for that purpose, shall be installed adjacent to
duit shall extend not less than 4 inches (102 mm) outside underground nonmetallic piping. Access shall be provided
of the building, shall be vented above grade to the out- to the tracer wire or the tracer wire shall terminate above
doors and shall be installed so as to prevent the entrance of ground at each end of the nonmetallic piping. The tracer
water and insects. wire size shall be not less than 18 AWG and the insulation
type shall be suitable for direct burial.
404.14.2 Conduit with both ends terminating indoors.
Where the conduit originates and terminates within the 404.18 Pipe cleaning. The use of a flammable or combusti-
same building, the conduit shall originate and terminate in ble gas to clean or remove debris from a piping system shall
an accessible portion of the building and shall not be be prohibited.
sealed. The conduit shall extend not less than 2 inches (51 404.19 Prohibited devices. A device shall not be placed
mm) beyond the point where the pipe emerges from the inside the piping or fittings that will reduce the cross-sec-
floor. tional area or otherwise obstruct the free flow of gas.
404.15 Outlet closures. Gas outlets that do not connect to Exceptions:
appliances shall be capped gas tight.
1. Approved gas filters.
Exception: Listed and labeled flush-mounted-type quick- 2. An approved fitting or device where the gas piping
disconnect devices and listed and labeled gas convenience system has been sized to accommodate the pressure
outlets shall be installed in accordance with the manufac- drop of the fitting or device.
turer’s instructions.
404.20 Testing of piping. Before any system of piping is put
404.16 Location of outlets. The unthreaded portion of piping in service or concealed, it shall be tested to ensure that it is
outlets shall extend not less than l inch (25 mm) through fin- gas tight. Testing, inspection and purging of piping systems
ished ceilings and walls and where extending through floors
shall comply with Section 406.
or outdoor patios and slabs, shall be not less than 2 inches (51
mm) above them. The outlet fitting or piping shall be securely
supported. Outlets shall not be placed behind doors. Outlets SECTION 405 (IFGS)
shall be located in the room or space where the appliance is PIPING BENDS AND CHANGES IN DIRECTION
installed.
405.1 General. Changes in direction of pipe shall be permit-
Exception: Listed and labeled flush-mounted-type quick-
ted to be made by the use of fittings, factory bends or field
disconnect devices and listed and labeled gas convenience bends.
outlets shall be installed in accordance with the manufac-
turer’s instructions. 405.2 Metallic pipe. Metallic pipe bends shall comply with
the following:
404.17 Plastic pipe. The installation of plastic pipe shall
comply with Sections 404.17.1 through 404.17.3. 1. Bends shall be made only with bending tools and pro-
cedures intended for that purpose.
404.17.1 Limitations. Plastic pipe shall be installed out-
2. Bends shall be smooth and free from buckling, cracks
doors underground only. Plastic pipe shall not be used
or other evidence of mechanical damage.
within or under any building or slab or be operated at pres-
sures greater than 100 psig (689 kPa) for natural gas or 30 3. The longitudinal weld of the pipe shall be near the neu-
psig (207 kPa) for LP-gas. tral axis of the bend.
Exceptions: 4. Pipe shall not be bent through an arc of more than 90
degrees (1.6 rad).
1. Plastic pipe shall be permitted to terminate above
ground outside of buildings where installed in 5. The inside radius of a bend shall be not less than six
premanufactured anodeless risers or service head times the outside diameter of the pipe.

2018 INTERNATIONAL FUEL GAS CODE ® 73
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