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| Term | Definition |
|---|---|
| Tertiary Air | Air for combustion supplied to the furnace to supplement the primary and secondary air. |
| Theoretical Air | The quantity of air required for perfect combustion. |
| Theoretical Draft | The draft which would be available at the base of a stack if there were no friction or acceleration losses in the stack. |
| Theoretical Flame Temperature | See "Adiabatic Flame Temperature." |
| Therm | A unit of heat applied especially to gas. One therm = 100,000 Btu. |
| Thermal Efficiency | The efficiency of a boiler, based on the ratio of heat absorbed to total heat input. This does not include heat loss from the boiler shell. |
| Thermal Shock | A cycle of temperature swings that result in failure of metal due to expansion and contraction. |
| Thermocouple | A temperature measuring instrument. |
| Tile | A preformed refractory, usually applied to shapes other than standard brick. |
| Total Air | The total quantity of air supplied to the fuel and products of combustion. Percent total air is the ratio of total air to theoretical air, expressed as percent. |
| Total Pressure | The sum of the static and velocity pressures. |
| Total Solids Concentration | The weight of dissolved and suspended impurities in a unit weight of boiler water, usually expressed in ppm. |
| Trap | A receptacle for the collection of undesirable material. |
| Treated Water | Water which has been chemically treated to make it suitable for boiler feed. |
| Trim | Ancillary boiler components, like water level controls, pressure controls, and temperature controls. |
| Tube | A hollow cylinder for conveying fluids. |
| Tube Hole | A hole in a drum, heater, or tube sheet to accommodate a tube. |
| Turbulent Burner | A burner in which fuel and air are mixed and discharged into the furnace in such a manner as to produce turbulent flow from the burner. |
| Turndown Ratio | Ratio of maximum to minimum fuel or steam input or boiler output. |
