Page 609 - 2018_IRC

FUEL GAS

Appliance shutoff valves located in the firebox of a fire- 6. A tee fitting with one opening capped or plugged shall
place shall be installed in accordance with the appliance be installed not less than 10 pipe diameters downstream
manufacturer’s instructions. of the MP regulator outlet. Such tee fitting shall be
G2420.5.2 (409.5.2) Vented decorative appliances and positioned to allow connection of a pressure-measuring
room heaters. Shutoff valves for vented decorative appli- instrument. The tee fitting is not required where the MP
ances, room heaters and decorative appliances for installa- regulator serves an appliance that has a pressure test
tion in vented fireplaces shall be permitted to be installed port on the gas control inlet side and the appliance is
in an area remote from the appliances where such valves located in the same room as the MP regulator.
are provided with ready access. Such valves shall be per- 7. Where connected to rigid piping, a union shall be
manently identified and shall not serve another appliance. installed within 1 foot (304 mm) of either side of the
The piping from the shutoff valve to within 6 feet (1829 MP regulator.
mm) of the appliance shall be designed, sized and
installed in accordance with Sections G2412 through G2421.3 (410.3) Venting of regulators. Pressure regulators
G2419. that require a vent shall be vented directly to the outdoors.
The vent shall be designed to prevent the entry of insects,
G2420.5.3 (409.5.3) Located at manifold. Where the water and foreign objects.
appliance shutoff valve is installed at a manifold, such
shutoff valve shall be located within 50 feet (15 240 mm) Exception: A vent to the outdoors is not required for reg-
of the appliance served and shall be readily accessible and ulators equipped with and labeled for utilization with an
permanently identified. The piping from the manifold to approved vent-limiting device installed in accordance with
within 6 feet (1829 mm) of the appliance shall be the manufacturer’s instructions.
designed, sized and installed in accordance with Sections G2421.3.1 (410.3.1) Vent piping. Vent piping for relief
G2412 through G2419. vents and breather vents shall be constructed of materials
G2420.6 (409.7) Shutoff valves in tubing systems. Shutoff allowed for gas piping in accordance with Section G2414.
valves installed in tubing systems shall be rigidly and Vent piping shall be not smaller than the vent connection
securely supported independently of the tubing. on the pressure-regulating device. Vent piping serving
relief vents and combination relief and breather vents shall
be run independently to the outdoors and shall serve only a
SECTION G2421 (410) single device vent. Vent piping serving only breather vents
FLOW CONTROLS is permitted to be connected in a manifold arrangement
where sized in accordance with an approved design that
G2421.1 (410.1) Pressure regulators. A line pressure regu-
lator shall be installed where the appliance is designed to minimizes backpressure in the event of diaphragm rupture.
operate at a lower pressure than the supply pressure. Line gas Regulator vent piping shall not exceed the length specified
pressure regulators shall be listed as complying with ANSI in the regulator manufacturer’s instructions.
Z21.80/CSA 6.22. Access shall be provided to pressure regu- G2421.4 (410.4) Excess flow valves. Where automatic
lators. Pressure regulators shall be protected from physical excess flow valves are installed, they shall be listed in accor-
damage. Regulators installed on the exterior of the building dance with ANSI Z21.93/CSA 6.30 and shall be sized and
shall be approved for outdoor installation. installed in accordance with the manufacturer’s instructions.
G2421.2 (410.2) MP regulators. MP pressure regulators G2421.5 (410.5) Flashback arrestor check valve. Where
shall comply with the following: fuel gas is used with oxygen in any hot work operation, a
1. The MP regulator shall be approved and shall be suit- listed protective device that serves as a combination flash-
able for the inlet and outlet gas pressures for the appli- back arrestor and backflow check valve shall be installed at
cation. an approved location on both the fuel gas and oxygen supply
lines. Where the pressure of the piped fuel gas supply is
2. The MP regulator shall maintain a reduced outlet pres-
sure under lock-up (no-flow) conditions. insufficient to ensure such safe operation, approved equip-
ment shall be installed between the gas meter and the appli-
3. The capacity of the MP regulator, determined by pub- ance that increases pressure to the level required for such safe
lished ratings of its manufacturer, shall be adequate to operation.
supply the appliances served.
4. The MP pressure regulator shall be provided with
access. Where located indoors, the regulator shall be SECTION G2422 (411)
vented to the outdoors or shall be equipped with a leak- APPLIANCE CONNECTIONS
limiting device, in either case complying with Section G2422.1 (411.1) Connecting appliances. Appliances shall
G2421.3. be connected to the piping system by one of the following:
5. A tee fitting with one opening capped or plugged shall 1. Rigid metallic pipe and fittings.
be installed between the MP regulator and its upstream
shutoff valve. Such tee fitting shall be positioned to 2. Corrugated stainless steel tubing (CSST) where
allow connection of a pressure-measuring instrument installed in accordance with the manufacturer’s instruc-
and to serve as a sediment trap. tions.

584 2018 INTERNATIONAL RESIDENTIAL CODE ®
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