Page 28 - 2018_IFGC

DEFINITIONS

[M] JOINT, FLARED. A metal-to-metal compression joint combustion takes place to accomplish the function for which
in which a conical spread is made on the end of a tube that is the appliance is designed.
compressed by a flare nut against a mating flare. METER. The instrument installed to measure the volume of
JOINT, MECHANICAL. A general form of gas-tight joints gas delivered through it.
obtained by the joining of metal parts through a positive-hold- MODULATING. Modulating or throttling is the action of a
ing mechanical construction, such as a press joint, flanged control from its maximum to minimum position in either pre-
joint, threaded joint, flared joint or compression joint. determined steps or increments of movement as caused by its
[M] JOINT, PLASTIC ADHESIVE. A joint made in ther- actuating medium.
moset plastic piping by the use of an adhesive substance that [M] NONCOMBUSTIBLE MATERIALS. Materials that,
forms a continuous bond between the mating surfaces with- where tested in accordance with ASTM E136, have not fewer
out dissolving either one of them. than three of four specimens tested meeting all of the follow-
[M] JOINT, PLASTIC HEAT FUSION. A joint made in ing criteria:
thermoplastic piping by heating the parts sufficiently to per- 1. The recorded temperature of the surface and interior
mit fusion of the materials when the parts are pressed thermocouples shall not at any time during the test rise
together. more than 54ºF (30ºC) above the furnace temperature at
the beginning of the test.
[M] JOINT, WELDED. A gas-tight joint obtained by the
joining of metal parts in molten state. 2. There shall not be flaming from the specimen after the
first 30 seconds.
[A] LABELED. Equipment, materials or products to which
have been affixed a label, seal, symbol or other identifying 3. If the weight loss of the specimen during testing
mark of a nationally recognized testing laboratory, approved exceeds 50 percent, the recorded temperature of the
agency or other organization concerned with product evalua- surface and interior thermocouples shall not at any time
tion that maintains periodic inspection of the production of during the test rise above the furnace air temperature at
the above-labeled items and whose labeling indicates either the beginning of the test, and there shall not be flaming
that the equipment, material or product meets identified stan- of the specimen.
dards or has been tested and found suitable for a specified [A] OCCUPANCY. The purpose for which a building, or
purpose. portion thereof, is utilized or occupied.
LEAK CHECK. An operation performed on a gas piping [M] OFFSET (VENT). A combination of approved bends
system to verify that the system does not leak. that makes two changes in direction bringing one section of
the vent out of line but into a line parallel with the other sec-
LIMIT CONTROL. A device responsive to changes in pres-
sure, temperature or level for turning on, shutting off or throt- tion.
tling the gas supply to an appliance. ORIFICE. The opening in a cap, spud or other device
whereby the flow of gas is limited and through which the gas
LIQUEFIED PETROLEUM GAS or LPG (LP-GAS).
Liquefied petroleum gas composed predominately of pro- is discharged to the burner.
pane, propylene, butanes or butylenes, or mixtures thereof OUTLET. The point at which a gas-fired appliance connects
that is gaseous under normal atmospheric conditions, but is to the gas piping system.
capable of being liquefied under moderate pressure at normal OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM
temperatures. (ODS). A system designed to act to shut off the gas supply to
the main and pilot burners if the oxygen in the surrounding
[A] LISTED. Equipment, materials, products or services
included in a list published by an organization acceptable to atmosphere is reduced below a predetermined level.
the code official and concerned with evaluation of products PILOT. A small flame that is utilized to ignite the gas at the
or services that maintains periodic inspection of production main burner or burners.
of listed equipment or materials or periodic evaluation of ser- [M] PIPING. Where used in this code, “piping” refers to
vices and whose listing states either that the equipment, mate- either pipe or tubing, or both.
rial, product or service meets identified standards or has been Pipe. A rigid conduit of iron, steel, copper, copper-alloy or
tested and found suitable for a specified purpose.
plastic.
[M] LIVING SPACE. Space within a dwelling unit utilized Tubing. Semirigid conduit of copper, copper-alloy alumi-
for living, sleeping, eating, cooking, bathing, washing and num, plastic or steel.
sanitation purposes.
PIPING SYSTEM. The fuel piping, valves and fittings from
LOG LIGHTER. A manually operated solid fuel ignition the outlet of the point of delivery to the outlets of the appli-
appliance for installation in a vented solid fuel-burning fire- ance shutoff valves.
place.
[M] PLASTIC, THERMOPLASTIC. A plastic that is capa-
LUBRICATED PLUG-TYPE VALVE. A valve of the plug ble of being repeatedly softened by increase of temperature
and barrel type provided with means for maintaining a lubri- and hardened by decrease of temperature.
cant between the bearing surfaces.
POINT OF DELIVERY. For natural gas systems, the point
MAIN BURNER. A device or group of devices essentially of delivery is the outlet of the service meter assembly or the
forming an integral unit for the final conveyance of gas or a outlet of the service regulator or service shutoff valve where a
mixture of gas and air to the combustion zone, and on which meter is not provided. Where a valve is provided at the outlet

2018 INTERNATIONAL FUEL GAS CODE  15
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