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Package boiler
A package boiler or packaged boiler is a modern form of steam boiler. They are factory-made to a range of standard designs, according to the size and evaporative capacity required. They are used as both hydronic boilers for heating and as steam generators for small power purposes. The advantages of a package boiler are that they are available 'off the shelf' without a lengthy design step and also that they are simpler to install. Package boilers are also cheaper to operate as they automatically manage their burner and water level, so not requiring the continual attention of a boilerman.
Package boilers are not used for large-scale power purposes such as electrical power generation. These use more complex and more efficient custom-designed boilers, usually today water-tube boilers working at high pressure.
== Internal arrangement ==
The internal arrangement of a package boiler is usually a one- or two-pass fire-tube boiler with an internal furnace tube. This is similar to the much earlier Scotch boiler.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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