Scotch Marine Boiler
A "Scotch" marine boiler (or simply Scotch boiler) is a design of steam boiler best known for its use on ships.
The general layout is that of a squat horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell. Above this is a large number of small-diameter fire-tubes. Gases and smoke from the furnace pass to the back of the boiler, then return through the small tubes and up and out of the chimney. The ends of these multiple tubes are capped by a smokebox, outside the boiler shell.
The Scotch boiler is a fire-tube boiler, in that hot flue gases pass through tubes set within a tank of water. As such, it is a descendant of the earlier Lancashire boiler and like the Lancashire it uses multiple separate furnaces to give greater heating area for a given furnace capacity. It differs from the Lancashire in two aspects: a large number of small diameter tubes (typically 3 or 4 inches diameter each) are used to increase the ratio of heating area to cross-section. Secondly the overall length of the boiler is halved by folding the gas path back on itself.
Other articles related to "scotch marine boiler, boiler, scotch, boilers":
... For more details on this topic, see Scotch marine boiler ... The Scotch marine boiler differs dramatically from its predecessors in using a large number of small-diameter tubes ... through a combustion chamber – an enclosed volume contained entirely within the boiler shell – so that the flow of flue gas through the firetubes is from back to front ...
... Numerous Scotch boilers are in use on ships as of 2011 and new boilers can be built to replace life-expired ones ... fully operational and has two, oil-fired, scotch boilers ... One coal fired wet back scotch marine boiler with two furnaces ...