What defines a Scotch Marine boiler?

A Scotch Marine boiler is characterized by having a cylindrical shell that is typically surrounded by water, which enables efficient heat transfer for steam generation. The design features a series of fire tubes through which hot gases pass. This construction helps to maintain a compact footprint while providing effective steam generation for various applications in marine and industrial contexts.

The self-contained nature of the Scotch Marine boiler allows it to integrate easily into different setups, making it versatile for both ships and land-based operations. The cylindrical shape contributes to the boiler's structural integrity and efficiency in heat exchange, which is crucial in maintaining the steam pressure required for various processes.

Other characteristics, such as whether the boiler is externally or internally fired, or the complexity of its design, do not define the Scotch Marine boiler specifically. The focus on its cylindrical shell and self-contained structure is essential in understanding its primary function and usability.