| Term | Definition |
|---|
| Ignition | The initiation of combustion.
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| Ignition Temperature | Lowest temperature of a fuel at which combustion becomes self-sustaining.
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| Illuminants | Light oil or coal compounds that readily burn with a luminous flame, such as ethylene, propylene and benzene.
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| Incomplete Combustion | The partial oxidation of the combustible constituents of a fuel.
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| Induced Draft Fan | A fan exhausting hot gases from the heat absorbing equipment.
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| Inert Gaseous Constituents | Incombustible gases such as nitrogen which may be present in a fuel.
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| Inhibitor | A substance which selectively retards a chemical action. An example in boiler work is the use of an inhibitor, when using acid to remove scale, to prevent the acid from attacking the boiler metal.
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| Injector | A device utilizing a steam jet to entrain and deliver feed water into a boiler.
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| Insulation | A material of low thermal conductivity used to reduce heat losses.
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| Integral Blower | A blower built as an integral part of a device to supply air thereto.
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| Integral Blower Burner | A burner of which the blower is an integral part.
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| Interlock | A device to prove the physical state of a required condition, and to furnish that proof to the primary safety control circuit.
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| Intermittent Blowdown | The blowing down of boiler water at intervals.
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| Internal Treatment | The treatment of boiler water by introducing chemicals directly into the boiler.
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| Ion | A charged atom or radical which may be positive or negative.
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| IRI | Industrial Risk Insurers.
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