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Boiler glossary F |
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| FAIL-SAFE -- Design in which power supply, control or
structural failure leads to automatic operation of protective device; normally
shut down of the burner. A characteristic of a particular type of actuator, which upon loss of power supply will act in a predetermined way, i.e., cause the valve plug to fully close, fully open or remain in fixed position. FATIGUE -- The tendency of a material to break under repeated strain. FEED PUMP -- A pump that supplies water to a boiler. FEED WATER -- The water supplied to the boiler to replace the steam that has been used. Water that enters the drum from the feedline. Usually hot, it may consist of a mixture of condensate and makeup water. FEED WATER INJECTOR -- It forces water into a boiler against the boiler pressure by means of a steam jet. FEED WATER TREATMENT -- The treatment of boiler feed water by the addition of chemicals to prevent the formation of scale or to eliminate other objectionable characteristics. FEU -- Maritime abbreviation for "forty-foot equivalent unit" which refers to a container that is 40 feet in length. (12.19 meter) FIRE BARS -- The grate that supports the fuel in the firebox so that air for combustion can be drawn through it. FIREBOX -- The furnace of the boiler. FIRE-TUBE BOILER -- A type of boiler design in which combustion gases flow inside the tubes and water flows outside the tubes. FLAME DETECTOR -- A device which indicates if a fuel is burning, or if ignition has been lost. The indication signal is normally transmitted to a control system. FLAREBACK -- A backfire of flame and hot gases into a ship's fireroom from the firebox caused by a fuel oil explosion in the firebox. FLASH BOILER -- A monotube boiler in which the feed water evaporates to steam immediately in the tube. FLUE GAS -- The gaseous product of combustion in the flue to the stack. This stream is commonly kept at an elevated temperature to avoid condensation in flue stack. FLY ASH -- A fine ash from the pulverized fuel burned in power stations, used in brick-making and as a partial substitute for cement in concrete. FOAMING -- A condition that occurs when an organic substance, usually oil, is floating on the surface of the water in a boiler. Foaming is generally indicated in the gauge glass by large swings in water level. FORCED CIRCULATION -- The circulation of water in a boiler by means of an external pump. FORCED-DRAFT FAN -- A fan supplying air under pressure to the burner. FPSO -- Floating Production, Storage and Offloading. FRACTIONAL DISTILLATION -- A heat dependent process used to separate a substance into pure fractions. FSO -- Floating Storage and Offloading. 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. FULLY CONDENSING FURNACE -- A furnace designed with sufficient heat transfer surface to condense moisture from the flue products, thereby increasing furnace efficiency. FUNNEL -- The chimney of a boiler. Convection within it induces a draught through the firebox. FURNACE -- An enclosed space provided for the combustion of fuel. FUSIBLE PLUG -- A hollowed threaded plug having the hollowed portion filled with a low melting point material used, for example, in the crown of a boiler firebox. If the water level falls below them the metal in the plug melts and steam is dumped into the firebox to prevent serious overheating of the plates. |
© 2007 Lars Josefsson Boilers