| Term | Definition |
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| Baffle | A plate or wall for deflecting gases or liquids.
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| Baffle Tile | A tile for deflecting gases.
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| Baffle-Type Collector | A device in gas paths utilizing baffles so arranged as to deflect dust particles out of the gas stream.
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| Bag Filter | A device containing one or more cloth bags for recovering particles from the dust laden gas or air which is blown through it.
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| Bag-Type Collector | A filter in which the cloth filtering medium is made in the form of cylindrical bags.
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| Barometric Pressure | Atmospheric pressure as determined by a barometer usually expressed in inches of mercury.
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| Base Load | Base load is the term applied to that portion of a station or boiler load that is practically constant for long periods.
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| Beaded Tube End | The rounded exposed end of a rolled tube when the tube metal is formed over against the sheet in which the tube is rolled.
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| Blind Nipple | A nipple, or a short piece of pipe or tube, closed at one end.
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| Blow-Off Valve | A specially designed, manually operated, valve that connects to the boiler for the purpose of reducing the concentration of solids in the boiler or for draining purposes. (Often called bottom blowdown.)
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| Blowdown | Boiler water that is removed from the boiler in order to maintain the desired concentration levels of suspended and dissolved solids in the boiler and removal of sludge.
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| Blowdown Valve | A valve generally used to continuously regulate concentration of solids in the boiler, not a drain valve. (Often called continuous blowdown.)
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| Blowdown-Safety Valve | The difference between the pressure at which a safety valve opens and at which it closes.
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| Blower | A fan used to force air under pressure.
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| Boiler | A closed vessel in which water is heated, steam is generated, steam is superheated, or any combination thereof, under pressure or vacuum by the application of heat from combustible fuels, electricity or nuclear energy. |
| Boiler Efficiency | The term "boiler efficiency" is often substituted for combustion or thermal efficiency. True boiler efficiency is the measure of fuel-to-steam efficiency.
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| Boiler Horsepower | The evaporation of 34-1/2 lbs of water per hour from a temperature of 212 °F into dry saturated steam at the same temperature. Equivalent to 33,475 Btu/hr.
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| Boiler Rating | The heating capacity of a boiler expressed in boiler horsepower, Btu/hour, or pounds of steam/hour.
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| Boiler Shell | The outer cylindrical portion of a pressure vessel.
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| Boiler Water | A term construed to mean a representative sample of the circulating boiler water, after the generated steam has been separated and before the incoming feed water or added chemical becomes mixed with it so that its composition is affected.
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| Boiling | The conversion of a liquid into vapor with the formation of bubbles.
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| Boiling Out | The boiling of highly alkaline water in boiler pressure parts for the removal of oils, greases, etc.
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| Booster Fan | A device for increasing the pressure or flow of a gas.
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| Breeching | A duct that transports the products of combustion between parts of a steam generating unit or to the stack.
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| Bridgewall | A wall in a furnace over which the products of combustion pass.
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| British Thermal Unit (btu) | The mean British Thermal Unit is 1/180 of the heat required to raise the temperature of 1 lb of water from 32 °F to 212 °F at a constant atmospheric pressure. A Btu is essentially 252 calories.
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| Buckstay | A structural member placed against a furnace or boiler wall to restrain the motion of the wall.
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| Bunker C Oil | Residual fuel oil of high viscosity commonly used in marine and stationary steam power plants. (No. 6 fuel oil)
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| Burner | A device for the introduction of fuel and air into a furnace at the desired velocities, turbulence and concentration.
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| Burner Windbox | A plenum chamber around a burner that maintains an air pressure sufficient for proper distribution and discharge of secondary air.
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| Burner Windbox Pressure | The air pressure maintained in the windbox or plenum chamber measured above atmospheric pressure.
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| By-Pass (or bypass) | A passage for a fluid, permitting a portion of the fluid to flow around its normal pass flow channel.
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