Page 566 - 2018_IRC

FUEL GAS

JOINT, MECHANICAL. A general form of gas-tight joints more than 54ºF (30ºC) above the furnace temperature at
obtained by the joining of metal parts through a positive-hold- the beginning of the test.
ing mechanical construction, such as a press-connect joint, 2. There shall not be flaming from the specimen after the
flanged joint, threaded joint, flared joint or compression joint.
first 30 seconds.
JOINT, PLASTIC ADHESIVE. A joint made in thermoset 3. If the weight loss of the specimen during testing
plastic piping by the use of an adhesive substance that forms exceeds 50 percent, the recorded temperature of the
a continuous bond between the mating surfaces without dis- surface and interior thermocouples shall not at any time
solving either one of them.
during the test rise above the furnace air temperature at
LABELED. Equipment, materials or products to which have the beginning of the test, and there shall not be flaming
been affixed a label, seal, symbol or other identifying mark of of the specimen.
a nationally recognized testing laboratory, inspection agency OFFSET (VENT). A combination of approved bends that
or other organization concerned with product evaluation that make two changes in direction bringing one section of the
maintains periodic inspection of the production of the above- vent out of line, but into a line parallel with the other section.
labeled items and whose labeling indicates either that the
equipment, material or product meets identified standards or OUTLET. The point at which a gas-fired appliance connects
has been tested and found suitable for a specified purpose. to the gas piping system.

LEAK CHECK. An operation performed on a gas piping OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM
system to verify that the system does not leak. (ODS). A system designed to act to shut off the gas supply to
the main and pilot burners if the oxygen in the surrounding
LIQUEFIED PETROLEUM GAS or LPG (LP-GAS). atmosphere is reduced below a predetermined level.
Liquefied petroleum gas composed predominately of pro-
pane, propylene, butanes or butylenes, or mixtures thereof PILOT. A small flame that is utilized to ignite the gas at the
that is gaseous under normal atmospheric conditions, but is main burner or burners.
capable of being liquefied under moderate pressure at normal PIPING. Where used in this code, “piping” refers to either
temperatures.
pipe or tubing, or both.
LISTED. Equipment, materials, products or services Pipe. A rigid conduit of iron, steel, copper, copper-alloy or
included in a list published by an organization acceptable to plastic.
the code official and concerned with evaluation of products
or services that maintains periodic inspection of production Tubing. Semirigid conduit of copper, copper-alloy, alumi-
of listed equipment or materials or periodic evaluation of ser- num, plastic or steel.
vices and whose listing states either that the equipment, mate- PIPING SYSTEM. The fuel piping, valves and fittings from
rial, product or service meets identified standards or has been
tested and found suitable for a specified purpose. the outlet of the point of delivery to the outlets of the appli-
ance shutoff valves.
LIVING SPACE. Space within a dwelling unit utilized for PLASTIC, THERMOPLASTIC. A plastic that is capable
living, sleeping, eating, cooking, bathing, washing and sanita- of being repeatedly softened by increase of temperature and
tion purposes.
hardened by decrease of temperature.
LOG LIGHTER. A manually operated solid-fuel ignition
appliance for installation in a vented solid fuel-burning fire- POINT OF DELIVERY. For natural gas systems, the point
of delivery is the outlet of the service meter assembly or the
place.
outlet of the service regulator or service shutoff valve where a
MAIN BURNER. A device or group of devices essentially meter is not provided. Where a valve is provided at the outlet
forming an integral unit for the final conveyance of gas or a of the service meter assembly, such valve shall be considered
mixture of gas and air to the combustion zone, and on which to be downstream of the point of delivery. For undiluted liq-
combustion takes place to accomplish the function for which uefied petroleum gas systems, the point of delivery shall be
the appliance is designed. considered to be the outlet of the service pressure regulator,
exclusive of line gas regulators, in the system.
METER. The instrument installed to measure the volume of
gas delivered through it. PRESSURE DROP. The loss in pressure due to friction or
obstruction in pipes, valves, fittings, regulators and burners.
MODULATING. Modulating or throttling is the action of a
control from its maximum to minimum position in either pre- PRESSURE TEST. An operation performed to verify the
determined steps or increments of movement as caused by its gas-tight integrity of gas piping following its installation or
actuating medium. modification.
NONCOMBUSTIBLE MATERIALS. Materials that, PURGE. To free a gas conduit of air or gas, or a mixture of
where tested in accordance with ASTM E136, have not fewer gas and air.
than three of four specimens tested meeting all of the follow-
ing criteria: READY ACCESS (TO). That which enables a device,
appliance or equipment to be directly reached, without
1. The recorded temperature of the surface and interior requiring the removal or movement of any panel, door or sim-
thermocouples shall not at any time during the test rise ilar obstruction. (See “Access.”)

2018 INTERNATIONAL RESIDENTIAL CODE ® 541
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