Page 91 - 2018_IFGC

GAS PIPING INSTALLATIONS

410.2 MP regulators. MP pressure regulators shall comply 410.5 Flashback arrestor check valve. Where fuel gas is
with the following: used with oxygen in any hot work operation, a listed protective
1. The MP regulator shall be approved and shall be suit- device that serves as a combination flashback arrestor and
able for the inlet and outlet gas pressures for the appli- backflow check valve shall be installed at an approved location
cation. on both the fuel gas and oxygen supply lines. Where the pres-
sure of the piped fuel gas supply is insufficient to ensure such
2. The MP regulator shall maintain a reduced outlet pres- safe operation, approved equipment shall be installed between
sure under lock-up (no-flow) conditions.
the gas meter and the appliance that increases pressure to the
3. The capacity of the MP regulator, determined by pub- level required for such safe operation.
lished ratings of its manufacturer, shall be adequate to
supply the appliances served.
SECTION 411 (IFGC)
4. The MP pressure regulator shall be provided with
access. Where located indoors, the regulator shall be APPLIANCE AND MANUFACTURED
vented to the outdoors or shall be equipped with a leak- HOME CONNECTIONS
limiting device, in either case complying with Section 411.1 Connecting appliances. Except as required by Section
410.3. 411.1.1, appliances shall be connected to the piping system
5. A tee fitting with one opening capped or plugged shall by one of the following:
be installed between the MP regulator and its upstream 1. Rigid metallic pipe and fittings.
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.
6. A tee fitting with one opening capped or plugged shall 3. Semirigid metallic tubing and metallic fittings. Lengths
be installed not less than 10 pipe diameters downstream shall not exceed 6 feet (1829 mm) and shall be located
of the MP regulator outlet. Such tee fitting shall be entirely in the same room as the appliance. Semirigid
positioned to allow connection of a pressure-measuring metallic tubing shall not enter a motor-operated appli-
instrument. The tee fitting is not required where the MP ance through an unprotected knockout opening.
regulator serves an appliance that has a pressure test
port on the gas control inlet side and the appliance is 4. Listed and labeled appliance connectors in compliance
located in the same room as the MP regulator. with ANSI Z21.24/CGA 6.10 and installed in accor-
dance with the manufacturer’s instructions and located
7. Where connected to rigid piping, a union shall be entirely in the same room as the appliance.
installed within 1 foot (304 mm) of either side of the
MP regulator. 5. Listed and labeled quick-disconnect devices used in
conjunction with listed and labeled appliance connec-
410.3 Venting of regulators. Pressure regulators that require tors.
a vent shall be vented directly to the outdoors. The vent shall
be designed to prevent the entry of insects, water and foreign 6. Listed and labeled convenience outlets used in conjunc-
objects. tion with listed and labeled appliance connectors.
7. Listed and labeled outdoor appliance connectors in
Exception: A vent to the outdoors is not required for regu-
lators equipped with and labeled for utilization with an compliance with ANSI Z21.75/CSA 6.27 and installed
approved vent-limiting device installed in accordance with in accordance with the manufacturer’s instructions.
the manufacturer’s instructions. 8. Listed outdoor gas hose connectors in compliance with
ANSI Z21.54 used to connect portable outdoor appli-
410.3.1 Vent piping. Vent piping for relief vents and
breather vents shall be constructed of materials allowed ances. The gas hose connection shall be made only in
for gas piping in accordance with Section 403. Vent piping the outdoor area where the appliance is used, and shall
shall be not smaller than the vent connection on the pres- be to the gas piping supply at an appliance shutoff
sure-regulating device. Vent piping serving relief vents valve, a listed quick-disconnect device or listed gas
and combination relief and breather vents shall be run convenience outlet.
independently to the outdoors and shall serve only a single 9. Gas hose connectors for use in laboratories and educa-
device vent. Vent piping serving only breather vents is tional facilities in accordance with Section 411.4.
permitted to be connected in a manifold arrangement 411.1.1 Commercial cooking appliances. Commercial
where sized in accordance with an approved design that cooking appliances installed on casters and appliances that
minimizes backpressure in the event of diaphragm rupture. are moved for cleaning and sanitation purposes shall be
Regulator vent piping shall not exceed the length specified connected to the piping system with an appliance connec-
in the regulator manufacturer’s instructions. tor listed as complying with ANSI Z21.69/CSA 6.16. The
410.4 Excess flow valves. Where automatic excess flow commercial cooking appliance connector installation shall
valves are installed, they shall be listed in accordance with be configured in accordance with the manufacturer’s
ANSI Z21.93/CSA 6.30 and shall be sized and installed in instructions. Movement of appliances with casters shall be
accordance with the manufacturer’s instructions. limited by a restraining device installed in accordance with
the connector and appliance manufacturer’s instructions.

78 2018 INTERNATIONAL FUEL GAS CODE ®
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