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| Term | Definition |
|---|---|
| Fan | A machine consisting of a rotor and housing for moving air or gases at relatively low pressure differentials. |
| Fan Performance | A measure of fan operation in terms of volume, total pressures, static pressures, speed, power input, mechanical and static efficiency, at a stated air density. |
| Fan Performance Curves | The graphical presentation of total pressure, static pressure, power input, mechanical and static efficiency as ordinates and the range of volumes as abscissa, all at constant speed and air density. |
| Feed Pump | A pump that supplies water to a boiler. |
| Feedwater | Water introduced into a boiler during operation. It includes make-up and return condensate. |
| Feedwater Treatment | The treatment of boiler feed water by the addition of chemicals to prevent the formation of scale or to eliminate other objectionable characteristics. |
| FGR | Flue Gas Recirculation or the recirculation of flue gas with combustion air to reduce NOx emissions. |
| Filter | Porous material through which fluids or fluid - and solid mixtures are passed to separate matter held in suspension. |
| Fin | A fin is an extended surface, a solid, experiencing energy transfer by conduction within its boundaries, as well as energy transfer with its surroundings by convection and/or radiation, used to enhance heat transfer by increasing surface area. |
| Fin Tube | A tube with one or more fins. |
| Fired Pressure Vessel | A vessel containing a fluid under pressure exposed to heat from the combustion of fuel. |
| Firetube | A type of boiler design in which combustion gases flow inside the tubes and water flows outside the tubes. |
| Firing Rate Control | A pressure temperature or flow controller which controls the firing rate of a burner according to the deviation from pressure or temperature set point. The system may be arranged to operate the burner on-off, high-low or in proportion to load demand. |
| Fixed Carbon | The carbonaceous residue less the ash remaining in the test container after the volatile matter has been driven off in making the proximate analysis of a solid fuel. |
| Flame | A luminous body of burning gas or vapor. |
| Flame Detector | A device which indicates if a fuel (liquid, gaseous, or pulverized) is burning, or if ignition has been lost. The indication may be transmitted to a signal or to a control system. |
| Flame Propagation Rate | Speed of travel of ignition through a combustible mixture. |
| Flame Safeguard | A control that sequences the burner through several stages of operation to provide proper air purge, ignition, normal operation, and shutdown for safe operation. |
| Flammability | Susceptibility to combustion. |
| Flash Point | The lowest temperature at which, under specified conditions, fuel oil gives off enough vapor to flash into a momentary flame when ignited. |
| Flashing | The process of producing steam by discharging water into a region of pressure lower than the saturation pressure that corresponds to the water temperature |
| Flue | A passage for products of combustion. |
| Flue Gas | The gaseous product of combustion in the flue to the stack. |
| FM | Factory Mutual. |
| Foaming | The continuous formation of bubbles which have sufficiently high surface tension to remain as bubbles beyond the disengaging surface. |
| Forced Circulation | The circulation of water in a boiler by mechanical means external to the boiler. |
| Forced-Draft Fan | A fan supplying air under pressure to the fuel burning equipment. |
| Fouling | The accumulation of refuse in gas passages or on heat absorbing surfaces which results in undesirable restriction to the flow of gas or heat. |
| Free Ash | Ash which is not included in the fixed ash. |
| Fuel | A substance containing combustible used for generating heat. |
| Fuel Oil | A liquid fuel derived from petroleum or coal. |
| Fuel-Air Mixture | Mixture of fuel and air. |
| Fuel-Air Ratio | The ratio of the weight, or volume, of fuel to air. |
| Fuel-To-Steam Efficiency | The ratio of heat added to boiler feedwater to produce the output steam to the amount of energy inputted with fuel. |
| Furnace | An enclosed space provided for the combustion of fuel. |
| Furnace Pressure | Pressure occurring inside the combustion chamber; positive if greater than atmospheric, negative if less than atmospheric, and neutral if equal to atmospheric. |
| Furnace Volume | The cubic contents of the furnace or combustion chamber. |
| Fusible Plug | A hollowed threaded plug having the hollowed portion filled with a low melting point material. |
