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HomeMy WebLinkAbout2021-06-30-2001 DEFINITIONS §200 Definitions. ADMINISTRATIVE AUTHORITY. The person or persons authorized to administer and enforce the requirements in this text. AIR MIXER. That portion of an injection (Bunsen) type burner into which the primary air is introduced. AIR SHUTTER. An adjustable devise for varying the size of the primary air inlet or inlets. APPLIANCE. A gas appliance is any device, which utilizes gas fuel to produce light, heat or power. APPLIANCE - AUTOMATICALLY CONTROLLED. Appliances equipped with automatic pilot and other automatic devices which: A. Accomplish complete turn-on and shut-off of the gas to the main burner or burners. B. Graduate the gas supply to the burner or burners, but do not effect complete shut off of the gas. APPLIANCE FLUE. The flue passages within the appliance. AUTOMATIC GAS SHUT OFF VALVE. A device so constructed that the attainment of a temperature or pressure in the medium being heated in excess of some predetermined limit acts upon a chemical, metallic or diaphragm element in such a way as to cause the gas to the appliance to be shut off and remain off. AUTOMATIC IGNITION. Automatic ignition shall be interpreted as means which provide for ignition of the gas at the burner when the gas burner valve controlling the gas to that burner is turned on, and will effect reignition if the flames on the burner have been extinguished by means other than closing the gas burner valve. AUTOMATIC PILOT. Consists of an automatic pilot device and pilot burner securely assembled in fixed functional relationship. AUTOMATIC PILOT DEVICE. A device employed with gas burning equipment which will automatically shut off the gas supply to the burner being served by either direct or indirect means when the pilot flame is extinguished. The pilot burner may or may not be constructed integrally with the device. 2 AUTOMATIC PILOT, COMPLETE SHUT OFF TYPE. An automatic pilot for shutting off, automatically the gas supply to the main burner and pilot in event of pilot or gas failure, and also for preventing the gas from being turned into the main burner unless the pilot is lighted. BAFFLE. An object placed in an appliance to change the direction of, or retard the flow of air, air-gas mixture, or flue gases. BOILER. A self-contained gas burning appliance for supplying hot water or low pressure steam, primarily intended for domestic and commercial space heating application. BRANCH LINE. Gas piping which conveys gas from a supply line to the appliance. BTU. Abbreviation for British Thermal Unit which is the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit. BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. A. Injection (Bunsen) Type Burner. A burner employing the energy of a jet of gas to inject air for combustion into the burner and mix it with gas. (1) Atmospheric Injection Type Burner. A burner in which the air at atmospheric pressure is injected into the burner by a jet or gas. B. Luminous or Yellow Flame Burner. A burner in which secondary air only is depended on for the combustion of the gas. C. Power Burner. A burner in which either gas or air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure; this added pressure, being applied at the burner. (1) Pre-Mixing Burner. A power burner in which all or nearly all of the air for combustion is mixed with the gas as primary air. D. Pressure Burner. A power burner which is supplied with an air-gas mixture under pressure (usually from 0.5 to 14 in. of water and occasionally higher.) CENTRAL HEATING GAS APPLIANCE. A vented gas-fired appliance comprising the following classes as defined herein: boiler, central furnace, floor furnace, or vented recessed heater. CHIMNEY. A vertical masonry or reinforced concrete shaft containing one or more flues or vents. CLOSED WATER PIPING SYSTEM. A system of water piping where a check valve or 3 other device prevents the free return of water or steam to the water main. CLOTHES DRYER. A device used to dry wet laundry by means of heat derived from the combustion of fuel gas. COMBUSTIBLE CONSTRUCTION. By combustible construction is meant a combustible wall or combustible surface constructed of wood, composition, or of wooden studding and lath and plaster. COMBUSTION. Combustion, as used herein, is the rapid oxidation of fuel gases, accompanied by the production of heat, or heat and light. COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs. COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including the inerts but excluding excess air. CONCEALED GAS PIPING. Gas piping which, when in place in the finished building, will be hidden from view by the structure. CONDENSATE - (Condensation). The liquid which separates from a gas (including flue gas) due to the reduction in temperature. CONSUMER'S GAS PIPING. All gas piping and fittings extending from the point of delivery to the outlets exclusive of piping, meters, regulators, valves, fittings, etc., owned by the gas company. CONTROL. A device designed to regulate the gas, air, water and electrical supply to a gas appliance. It may be manual or automatic. CONVERSION BURNER. A burner designed to supply gaseous fuel to an appliance originally designed to utilize another fuel. CUBIC FOOT (Cu. Ft.) OF GAS. The amount of gas which would occupy 1 ct. ft. when at a temperature of 60 degrees F. saturated with water vapor and under a pressure equivalent to that of 30 in. of mercury. DEMAND. The maximum amount of gas required per unit of time, usually expressed in cut. ft. per hr., or Btu per hr., required for the operation of the appliance or appliances supplied. DIVERSITY FACTOR. Ratio of the maximum probable demand to the maximum possible demand. DRAFT HOOD. A device built into an appliance, or made a part of the flue or vent 4 connector from an appliance, which is designed to (1) insure the ready escape of the products of combustion in the event of no draft, back draft, or stoppage beyond the draft hood; (2) prevent a back draft from entering the appliance; and (3) neutralize the effect of stack action of the flue or vent upon the operation of the appliance. DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed. DUCT FURNACE. A furnace normally installed in distribution ducts of air conditioning systems to supply warm air for heating. This definition shall apply only to an appliance which depends for air circulation on a blower not furnished as part of the furnace. EXCESS AIR. Air which passes through the combustion chamber and the appliance flues in excess of that which is theoretically required for complete combustion. EXPOSED PIPING. Gas piping which will be in view in the finished structure. FIRING VALVE. A valve of the plug and barrel type designed for use with gas, and equipped with a level handle for manual operation and a dial to indicate the percent of opening. FLAME SAFEGUARD. A device which will automatically shut off the gas supply to a main burner or group of burners when the means of ignition of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners. FLAMES A. Yellow, Luminous or Non-Bunsen. The flame produced by burning without any premixing of the air with the gas. B. Bunsen. The flame produced by premixing some of the air required for combustion with the gas before it reaches the burner ports or point of ignition. FLOOR FURNACE. A completely self-contained unit furnace suspended from the floor of the space being heated, taking air for combustion from outside this space, and with means for observing flames and lighting the appliance from such space. A. Gravity Type Floor Furnace. A floor furnace depending primarily upon circulation of air by gravity. This classification shall also include floor furnaces equipped with booster type fans which do not materially restrict free circulation of air by gravity flow when such fans are not in operation. B. Fan Type Floor Furnace. A floor furnace equipped with a fan which provides the primary means of circulating air. 5 FLUE OR VENT. A conduit or passageway, vertical or nearly so, for conveying flue gases to the outer air. FLUE COLLAR. That portion of an appliance designed for the attachment of the draft hood or flue or vent. FLUE OR VENT CONNECTOR. The pipe connecting an appliance with the flue or vent. This corresponds to the smoke pipe used with an incinerator or solid or liquid fuels. FURNACE. A self contained gas-burning appliance for heating air by secondary transfer of heat from the flue gases through metal to the air, usually located outside of the room or rooms being heated. A. Gravity Type Warm Air Furnace. A furnace depending primarily upon circulation of air by gravity. This classification shall also include furnaces equipped with booster type fans which do not materially restrict free circulation of air by gravity flow when such fans are not in operation. B. Forced Air Type Warm Air Furnace. A furnace equipped with a fan which provides the primary means for circulation of air and of sufficient capacity to deliver air at a temperature rise of not more than 100 degrees F above room temperature when opening against an imposed static pressure of 0.2 in. equivalent water column with the furnace operating at its rate Btu input incapacity. GAS COMPANY. The organization operating the gas distribution system. GAS HOSE. A gas conduit which depends for tightness on joint packing, or on any wall structure other than that formed by a continuous one-piece metal tubing member. GRAVITY. (See Specific Gravity.) HEATING VALUE (total). The number of British Thermal Units produced by the combustion at constant pressure, of 1. cu. ft. of gas when the products of combustion are cooled to the initial temperature of the gas and air, when the water vapor formed during combustion is condensed, and when all necessary corrections have been applied. HOTEL AND RESTAURANT RANGE. A gas appliance of the floor type providing for top cooking, roasting, baking or broiling or any combination of top cooking with any of these other functions and not designed specifically for domestic use. HOUSE PIPING. A. The gas piping from the point where it enters the building or foundation to and including the outlets. (Applicable where the gas meter is located some 6 distance from the building.) B. The gas piping from the gas meter to and including the outlets, (Applicable where the gas meter is located in or immediately adjacent to the building.) IGNITION PILOT. Is a pilot that operates during the lighting cycle and discontinues during the main burner operation. INCINERATOR. An appliance used to reduce refuse material to ashes, and which is sold as a complete unit. A. Portable Incinerator. An incinerator which is a complete unit in itself, and which does not become an integral part of the structure in which it is installed. B. Wall Incinerator. An incinerator which is a complete unit in itself designed to be installed in a fireproof wall or chimney, thereby becoming an integral part of the structure in which it is installed. INDUSTRIAL GAS BOILER. A gas appliance designed primarily to furnish steam for use in some process the nature of which is industrial or commercial, as distinguished from central heating. This definition does not apply to any boiler covered by the American Standard Approval Requirements for Central Heating Gas Appliances. INTERMITTENT PILOT. Is a pilot that operates during the ignition cycle and continues during main burner operation, but is shut off at other times. LIMIT CONTROL. A device responsive to changes in pressure or temperature or liquid level for turning on, shutting off, or throttling the gas supply to an appliance. LISTED. The word "listed" as used herein when not otherwise clarified means acceptable as outlined in '201.21.1 LUBRICATED PLUG TYPE VALVE. A valve of the plug and barrel type provided with means of maintaining a lubricant between the bearing surfaces. MAIN BURNER. a device or group of devices essentially forming an integral unit for the final conveyance of gas or a mixture of gas and air to the combustion zone, and on which combustion takes place to accomplish the function for which the appliance is designed. MAIN BURNER CONTROL VALVE. A valve which controls the gas supply to the main burner manifold. MANUAL GAS VALVE. A valve (or cock) of the plug or barrel type designed for use with gas, operated manually to control or shut off the supply of gas. 7 MANIFOLD. The conduit of an appliance which supplies gas to the individual burners. METER. The instrument installed to measure the volume of gas delivered through it. MODULATING. Modulating or throttling is the action of a control from its maximum to minimum position in either predetermined steps or increments of movements as caused by its actuating medium. ORIFICE. The opening in a cap, spud or other device whereby the flow of gas is limited and through which the gas is discharged to the burner. ORIFICE CAP (Hood) A movable fitting having an orifice which permits adjustment of the flow of gas either by substitution of a spud with a different sized orifice or by the motion of a needle with respect to it. ORIFICE SPUD. A removable plug or cap containing an orifice and which permits adjustments of the flow of gas either by substitution or a spud with a difference sized orifice or by the motion of a needle with respect to it. OUTLET. A threaded connection or bolted flange in a pipe system to which gas burning appliance is or may be attached. Outlets must be located in the room or space where the appliance is or may be installed. PILOT. A small flame which is utilized to ignite the gas at the main burner or burners. POINT OF DELIVERY. The initial junction of the gas company's piping, extending from the main, with the consumer's piping. PRIMARY AIR. The air introduced into a burner and which mixes with the gas before it reaches the port or ports. PURGE. To free a gas conduit of air, gas, or a mixture of gas and air. RECESSED HEATER. A self-contained appliance complete with grilles or equivalent, designed for incorporation in or permanent attachment to a wall, floor, ceiling or partition, either taking air for combustion from the space to be heated or having a sealed combustion system the inlet and outlet of which communicates only with the outside air, and furnishing heated air circulated by gravity in the casing. Such appliances shall not be provided with duct extensions beyond the vertical and horizontal limits of the casing proper, except that boots not be exceed 10 inches beyond the horizontal limits of the casing for extension through walls of nominal thickness may be permitted. Where such boots are provided they shall be supplied by the manufacturer as an integral part of the appliance and tested as such. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined. 8 A. Gravity Type Recessed Heater. A recessed heater depending on circulation of air by gravity. B. Fan Type Recessed Heaters. A recessed heater equipped with a fan. REGULATOR. A device for controlling and maintaining a uniform gas supply pressure. RELIEF DEVICE. A safety device designed to forestall the development of a dangerous condition in the medium being heated, by relieving pressure, temperature or vacuum build-up in the appliance. A. Pressure Relief Valve. An automatic device that opens or closes a relief vent, depending on whether the pressure is above or below a predetermined value. (1) Fusible Plug Type. A device which opens and keeps open a relief vent by the melting or softening of a fusible plug or cartridge at a predetermined temperature. (2) Resetting or Self-Closing Type. An automatic device that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value. B. Vacuum Relief Valve. An automatic device that opens or closes a relief vent depending on whether the vacuum is above or below a predetermined value. RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the vent of no draft, back draft, or stoppage beyond the draft hood, and to permit inspiration of air into the draft hood in the event of strong chimney updrafts. ROOM OR SPACE HEATER. A self-contained gas-burning appliance installed in and for heating rooms. This definition shall not include unit heaters, central heating gas appliances, nor garage heaters. SAFETY SHUT OFF VALVE. An automatic gas control valve of the "on" and "off" type which is actuated by the limit or protective controls or similar emergency devices. SECONDARY AIR. The air externally supplied to the flame at the point of combustion. SEMI-RIGID TUBING. A gas conduit having semi-flexible metal wall structure. SERVICE PIPE. The pipe which brings the gas from the gas main to the point of delivery. 9 SHUT OFF VALVE. (See definition of Manual Gas Valve.) SMOKE PIPE. (See Flue or Vent Connector). SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same conditions. STOP COCK. (See definition of Manual Gas Valve.) THERMOSTAT. An automatic device actuated by temperature changes, designed to control the gas supply to a burner, or burners, in order to maintain temperatures between predetermined limits. TYPE A FLUE OR VENT. Flues or vents of masonry, reinforced concrete, or metal smoke stacks. TYPE B GAS FLUE OR VENT. Vent piping of non-bustible, corrosion-registrant material of sufficient thickness, cross-sectional area, and heat insulating quality to avoid excess temperature on adjacent combustible material and certified by a nationally recognized testing agency. Type B- W gas vent is a type B vent listed to insure a safe and satisfactory installation in 2" x 4" wall construction. TYPE C GAS FLUE OR VENT. Flue or vent piping of sheet cooper of not less than the equivalent of No. 24 U. S. Standard gauge or of galvanized iron of not less than No. 24 U. S. Standard gauge or of another approved corrosion-resistant material. UNIT HEATER. A self-contained gas-burning appliance of the fan type, designed for the delivery of warm air directly into the space in which the appliance is located. UNLISTED BOILER. A boiler not originally furnished by the manufacturer with integrally assembled gas burner and automatic control devices and not listed by a nationally recognized testing agency. UNMEASURED GAS. Gas which has not passed through and the volume of which has not been registered by a meter. VALVE. (See definition of Manual Gas Valve.) VENT. (See definition of Flue or Vent.) WALL HEATER, UNVENTED OPEN-FLAME RADIANT TYPE. A room heater of the open front type, designed for insertion in or attachment to a wall or partition having full exposed flames the heat from which is reflected by ceramic radiants or a metal, asbestos, clay back or equivalent backwall reflecting surface. It incorporates no concealed venting arrangements in its construction and discharges all products of combustion, through the open front into the room being 10 heated. WATER HEATERS. A. Automatic Instantaneous. The type which heats the water as it is drawn. B. Automatic Storage. The type which combines a water heating element and water storage tank, gas to the main burner being controlled by a thermostat. C. Circulating or Tank. Manually controlled type usually connected to the ordinary hot water tank. YARD LINE. The section of consumer's piping and fittings extending from the point of delivery to the house piping.