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An automatically ignited pilot used to ignite the boiler main flame but is then automatically shut off while the boiler is running.

Related Terms

ABMA

American Boiler Manufacturers Association.

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

RETURN-STEAM CONDENSATE

That steam produced by a boiler which returns to the boiler after it has condensed.

ASME SECTION VII SUBSECTION C6

Operation of boiler auxiliaries.

ATOMIC ABSORPTION SPECTROSCOPY

Measures the radiation absorbed by chemically unbound atoms by analyzing the transmitted energy relative to the incident energy at each frequency. The procedure consists of diluting the fluid sample with methyl isobutyl ketone (MIBK) and directly aspirating the solution. The actual process of atomization involves reducing the solution to a fine spray, dissolving it, and finally vaporizing it with a flame. The vaporization of the metal particles depends upon their time in the flame, the flame temperature, and the composition of the flame gas. The spectrum occurs because atoms in the vapor state can absorb radiation at certain well-defined characteristic wave lengths. The wave length bands absorbed are very narrow and differ for each element. In addition, the absorption of radiant energy by electronic transitions from ground to excited state is essentially and absolute measure of the number of atoms in the flame and is, therefore, the concentration of the element in a sample.

ASME SECTION VII SUBSECTION C4

Prevention of direct causes of boiler failure.

ASME SECTION VII SUBSECTION C2

Operating and maintaining boiler appliances.

CONDENSATE POLISHER

A device used to clean the returning condensate to the boiler feedwater system.

CALCIUM

A scale forming element found in boiler feed water.

DE-CARBONATION

Refers to the removal of carbon dioxide from the boiler feedwater.
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