Term
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Definition
| 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. |
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Term
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Definition
| water is passed thru tubes and heated externally by the fire. |
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Term
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Definition
| A type of boiler design in which combustion gases flow inside the tubes and water flows outside the tubes. |
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Term
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Definition
| The vapor phase of water unmixed with other gases. |
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Term
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Definition
| The transmission of heat through and by means of matter unaccompanied by any obvious motion of the matter. |
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Term
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Definition
| The transmission of heat by the circulation of a liquid or gas. It may be natural, with the circulation caused by buoyancy affects due to temperature differences, or forced with circulation caused by a mechanical device such as a fan or pump. |
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Term
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Definition
| a process in which energetic particles or waves travel through a medium or space |
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Term
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Definition
| Air supplied for combustion in excess of that theoretically required for complete oxidation. |
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Term
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Definition
| Removal of air and gases from boiler feed water prior to its introduction to a boiler. |
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Term
| BRITISH THERMAL UNIT (Btu) |
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Definition
| 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 |
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Term
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Definition
| 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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Term
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Definition
| Air used in the combustion process. Air contains oxygen which is required to combust fuel. |
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Term
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Definition
| Condensed water resulting from the removal of latent heat from steam. |
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Term
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Definition
| Steam containing no moisture. Commercially dry steam containing not more than one half of one percent moisture |
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Term
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Definition
| Water introduced into a boiler during operation. It includes make-up and return condensate. |
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