Article Index

Boiler blowdown valve- Blowdown Valves are designed for continuous use to control the concentration of dissolved solids in boiler water. (This is not a drain valve)

Boiler blow off valve- Blow off valves are designed for applications requiring intermittent operation in order to remove accumulated sediment from equipment, piping or to lower boiler water level in a rapid manner.

Blower- The blower provides a forced draught on the fire, encouraging combustion.

Boiler- Is "a closed vessel” in which water or other liquid is heated, steam or vapor is produced, steam is superheated, or any blend therefrom, under pressure or vacuum, for use outer to itself, by the direct usage of energy from the combustion of fuels, from electricity or nuclear energy."

Boiler design steam pressure- The temperature of steam for which a boiler is designed.

Boiler drain- A valved connection at the lowest point for the removal of all water from the pressure parts.

Boiler drum- A cylindrical shell closed at both ends designed to withstand internal pressure.

Boiler capacity- The ratio of the average load carried to the maximum boiler design capacity.

Boiler Chemical feed pipe- A boiler chemical feed pipe is a pipe inside a boiler drum through which chemicals for treating the boiler water are introduced.

Boiler Chemical feed pump- A boiler chemical feed pump automatically delivers the proper dose of chemicals to treat your water.

Boiler efficiency- Boiler efficiency is the term boiler efficiency is often substituted for combustion or thermal efficiency. True boiler efficiency is the measure of fuel-to-steam efficiency.

Boiler feedpump- A pump that supplies water to a boiler.

Boiler feedwater- Water introduced into a boiler during operation. It includes make-up and return condensate.

Boiler feedwater regulator- A device for admitting feedwater to a boiler automatically on demand. Practically a constant water level should result.

Boiler feedwater treatment- The treatment of boiler feed water by the addition of chemicals to control alkalinity, prevent scaling, correct pH, and to control conductivity or to eliminate other objectionable characteristics.

Boiler horsepower- Boiler Horsepower is a unit of measurement for measuring 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.

Boiler rating- Heat capacity of a boiler expressed in boiler horsepower, Btu/hour, or pounds of steam/hour.

Boiler shell- The boiler shell the outer cylinder of a pressure vessel.

Boiler water- Boiler water is a relative sample of the circulating boiler water, after generated steam has been separated, before incoming feed water or added chemicals mix with it so that its composition is affected.

Boiling- The rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point and bubbles are formed.

Boiling out- Boiling high alkaline water in boiler pressure parts for the removal of oils, greases, etc.

Booster Fan- Device to increase the pressure or gas flow.

Breeching- Duct which transports the combustion products between parts of a steam generating unit or to the stack.

Bridgewall- A transverse baffle that serves to deflect products of combustion.

Brine- Concentration solution of salt added to pretreat hard water.

British thermal unit (Btu)- The amount of heat required to raise the temperature of 1 pound (0.4 kg) of water 1°F.

Buckstay- Beam held by stays to the exterior of a masonry wall, as that of a furnace or boiler, to keep the adjacent areas of the wall from being forced outward. Keeps the wall from moving.

Bunker C oil-/Fuel Oil No. 6. /Residual Heavy Fuel Oil/ Bunker C Fuel Oil/ -of high viscosity commonly used in marine and stationary steam power plants.

Burner- A device which combines fuel and air in proper proportions for combustion and which enables the fuel-air mixture to burn stably to give a specified flame size and shape.

Burner assembly- Burner assemblies are factory built as single and two or more assemblies which include all parts necessary for its normal function when installed as intended.

Burner block- The specifically fabricated intractable pieces mounted around the burner opening inside the furnace. The burner block forms the burner's airflow opening and helps stabilize the flame.

Burner capacity- Amount of fuel that can be completely burned through a burner at a given set of operating conditions.

Bypass- A passage for a fluid, allowing a percentage of the fluid to pass around its normal course flow channel.

Bypass temperature control- Controlling vapor or air temperature, diverting part of or all heating medium from passing over the heat absorbing surfaces, usually by means of a bypass damper.

C- Carbon element, the principal combustible components of all fuels.

CaCO3 - Calcium Carbonate.

Calorie- A calorie is the amount of energy required to raise one gram of water by one degree Celsius. The kilocalorie (kcal) is a unit used to measure process in industry, 1 kcal = 1000 calories.

Carbon- Element. The principal combustible constituent of all fuels.

Carryover- The chemical solids and liquid entrained with the film of steam bubbles, which is a result of foaming in a boiler. The carryover is a result of poor water condition in the boiler.

Casing- A covering of sheets of metal with fire resistant composition board or other material used to enclose all such portions of a steam generating unit.

Caustic cracking- Usually occurring in carbon steels or iron-chromium nickel alloys that are exposed to concentrated hydroxide solutions at temperatures of 400 to 480 deg. F., Also called caustic embrittlement cracking.

Central station- A power plant or steam heating plant that generates power or steam.

Check valve- A valve designed to prevent reverse flow. One direction flow is only permitted.

Chemical analysis  Determination of the principal chemical constituents.

Chimney- A brick, metal or concrete stack.