NFPA-86C-1999 Standard for Industrial Furnaces Using a Special Processing Atmosphere.
Burn-In. The procedure used in starting up a special atmo- sphere furnace to replace air within the heating chamber(s) and vestibule(s) with flammable special atmosphere. Burn-Out. The procedure used in shutting down or idling a special atmosphere to replace flammable atmosphere within the heating chamber(s) and vestibule(s) with a nonflammable atmosphere. Burner. A device or group of devices used for the introduc- tion of fuel, air, oxygen, or oxygen-enriched air into a furnace at the required velocities, turbulence, and concentration to maintain ignition and combustion of fuel. Burner, Atmospheric. A burner used in the low-pressure fuel gas or atmospheric system that requires secondary air for complete combustion. Burner, Atomizing. A burner in which oil is divided into a fine spray by an atomizing agent, such as steam or air. Burner, Blast. A burner delivering a combustible mixture under pressure, normally above 0.3 in. w.c. (75 kPa), to the combustion zone. Burner, Combination Fuel Gas and Oil. A burner that can burn either fuel gas or oil, or both simultaneously. Burner, Dual-Fuel. A burner designed to burn either fuel gas or oil, but not both simultaneously. Burner, Line. A burner whose flame is a continuous line. Burner, Multiple-Port. A burner having two or more sepa- rate discharge openings or ports. Burner, Nozzle Mixing. A burner in which the fuel and air are introduced separately to the point of ignition.
Controller, Excess Temperature Limit. A device designed to cut off the source of heat if the operating temperature exceeds a predetermined temperature set point. Controller, Programmable. A digital electronic system designed for use in an industrial environment that uses a pro- grammable memory for the internal storage of user-oriented instructions for implementing specific functions to control, through digital or analog inputs and outputs, various types of machines or processes. Controller, Temperature. A device that measures the tem- perature and automatically controls the input of heat into the furnace. Cryogenic Fluid. A fluid produced or stored at very low temperatures. In the context of this standard, cryogenic fluid generally refers to gases made at low temperatures and stored at the user site in an insulated tank for use as an atmosphere or atmosphere constituent (e.g., nitrogen, argon, carbon dioxide, hydrogen, oxygen). Damper, Cut-Away. A restricting airflow device that, when placed in the maximum closed position, allows a minimum amount of airflow past the restriction. Cut-away dampers nor- mally are placed in the exhaust or fresh air intake ducts to ensure that the required minimum amount of exhaust or fresh air is handled by the ventilating fans.NFPA-86C pdf download.