Page 581 - 2018_IRC

FUEL GAS

TABLE G2414.9.2 (403.9.2) 2. Fittings used with copper or copper alloy pipe shall
SPECIFICATIONS FOR THREADING METALLIC PIPE be copper or copper alloy.
APPROXIMATE LENGTH APPROXIMATE NO.
IRON PIPE SIZE OF THREADED PORTION OF THREADS TO BE 3. Cast-iron bushings shall be prohibited.
(inches)
(inches) CUT
1 / 2 3 / 4 10 4. Special fittings. Fittings such as couplings, propri-
3 / 3 / 10 etary-type joints, saddle tees, gland-type compres-
sion fittings, and flared, flareless and compression-
4 4
1 7 / 8 10 type tubing fittings shall be: used within the fitting
manufacturer’s pressure-temperature recommenda-
1
1 / 1 1 1 tions; used within the service conditions anticipated
4
1 / 2 1 1 1 with respect to vibration, fatigue, thermal expansion
1
and contraction; and shall be approved.
For SI: 1 inch = 25.4 mm. 5. Where pipe fittings are drilled and tapped in the
G2414.9.3 (403.9.3) Thread joint compounds. Thread field, the operation shall be in accordance with all of
joint compounds shall be resistant to the action of lique- the following:
fied petroleum gas or to any other chemical constituents of
the gases to be conducted through the piping. 5.1. The operation shall be performed on systems
G2414.10 (403.10) Metallic piping joints and fittings. The having operating pressures of 5 psi (34.5
type of piping joint used shall be suitable for the pressure- kPa) or less.
temperature conditions and shall be selected giving consider- 5.2. The operation shall be performed by the gas
ation to joint tightness and mechanical strength under the ser- supplier or the gas supplier’s designated rep-
vice conditions. The joint shall be able to sustain the resentative.
maximum end force caused by the internal pressure and any
additional forces caused by temperature expansion or con- 5.3. The drilling and tapping operation shall be
traction, vibration, fatigue, or to the weight of the pipe and its performed in accordance with written proce-
contents. dures prepared by the gas supplier.
G2414.10.1 (403.10.1) Pipe joints. Schedule 40 and 5.4. The fittings shall be located outdoors.
heavier pipe joints shall be threaded, flanged, brazed, 5.5. The tapped fitting assembly shall be
welded or assembled with press-connect fittings listed in inspected and proven to be free of leakage.
accordance with ANSI LC4/CSA 6.32. Pipe lighter than
Schedule 40 shall be connected using press-connect fit- G2414.11 (403.11) Plastic piping, joints and fittings. Plas-
tings, flanges, brazing or welding. Where nonferrous pipe tic pipe, tubing and fittings shall be joined in accordance with
is brazed, the brazing materials shall have a melting point the manufacturers’ instructions. Such joints shall comply
in excess of 1,000ºF (538ºC). Brazing alloys shall not con- with the following:
tain more than 0.05-percent phosphorus. 1. The joints shall be designed and installed so that the

G2414.10.2 (403.10.2) Copper tubing joints. Copper tub- longitudinal pull-out resistance of the joint will be
ing joints shall be assembled with approved gas tubing fit- greater than or equal to the tensile strength of the plas-
tings, shall be brazed with a material having a melting point tic piping material.
in excess of 1,000ºF (538ºC) or assembled with press-con- 2. Heat-fusion joints shall be made in accordance with
nect fittings listed in accordance with ANSI LC4/CSA 6.32. qualified procedures that have been established and
Brazing alloys shall not contain more than 0.05-percent proven by test to produce gas-tight joints as strong as or
phosphorus. stronger than the pipe or tubing being joined. Joints
G2414.10.3 (403.10.3) Stainless steel tubing joints. Stain- shall be made with the joining method recommended
less steel tubing joints shall be welded, assembled with by the pipe manufacturer. Heat fusion fittings shall be
approved tubing fittings, brazed with a material having a marked “ASTM D2513.”
melting point in excess of 1,000°F (538°C), or assembled
with press-connect fittings listed in accordance with ANSI 3. Where compression-type mechanical joints are used,
LC4/CSA 6.32. the gasket material in the fitting shall be compatible
with the plastic piping and with the gas distributed by
G2414.10.4 (403.10.4) Flared joints. Flared joints shall be the system. An internal tubular rigid stiffener shall be
used only in systems constructed from nonferrous pipe and used in conjunction with the fitting. The stiffener shall
tubing where experience or tests have demonstrated that the be flush with the end of the pipe or tubing and shall
joint is suitable for the conditions and where provisions are extend to or beyond the outside end of the compression
made in the design to prevent separation of the joints. fitting when installed. The stiffener shall be free of
G2414.10.5 (403.10.5) Metallic fittings. Metallic fittings rough or sharp edges and shall not be a force-fit in the
shall comply with the following: plastic. Split tubular stiffeners shall not be used.
1. Fittings used with steel, stainless steel or wrought- 4. Plastic piping joints and fittings for use in liquefied
iron pipe shall be steel, stainless steel, copper alloy, petroleum gas piping systems shall be in accordance
malleable iron or cast iron. with NFPA 58.

556 2018 INTERNATIONAL RESIDENTIAL CODE ®
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