A boiler is an enclosed vessel in which water is heated and circulated, either
as hot water or steam, to produce a source for either heat or power. A central
heating plant may have one or more boilers that use gas, oil, or coal as fuel.
The steam generated is used to heat buildings, provide hot water, and provide
steam for cleaning, sterilizing, cooking, and laundering operations. Small
package boilers also provide steam and hot water for small buildings.
A careful study of this course can help you acquire useful knowledge of steam
generation, types of boilers pertinent to boiler operations, various fittings
commonly found on boilers, and so on. The primary objective of this chapter is
to lay the foundation for you to develop skill in the operation, maintenance,
and repair of boilers.
(Photo courtesy U.S. Dept. of Labor)