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It differs from the Lancashire in two aspects: a large number of small-diameter tubes (typically 3 or 4 inches (76 or 102 mm) 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. Rear face of the boiler of steam tug, showing the stays supporting the combustion chambers The far end of the furnace is an enclosed box called the combustion chamber which extends upwards to link up with the firetubes. The front wall of the combustion chamber is supported against steam pressure by the tubes themselves. The rear face is by rod stays through the rear shell of the boiler. Above the combustion chamber and tubes is an open steam collecting space. ![]() Larger long rod stays run the length of the boiler through this space, supporting the ends of the boiler shell. With multiple furnaces, there is a separate combustion chamber for each furnace. A few small boilers did connect them into one chamber, but this design is weaker. A more serious problem is the risk of reversing the draught, where exhaust from one furnace could blow back and out of the adjacent one, injuring the stokers working in front of it. 'Wilberforce' boiler in section The first recorded boiler of comparable form was used in a railway locomotive, 's 'Wilberforce' class of 1830. This had a long cylindrical boiler shell similar to his earlier ', but with the return flue replaced by a number of small firetubes, as had been demonstrated so effectively by Stephenson with his ' a year earlier. The novel feature of an entirely internal combustion chamber was used. Unlike the later Scotch boiler though, this was self-supported by its own stays, rather than using stays through the walls of the boiler shell. This allowed the entire assembly of outer tubeplate, furnace tube, combustion chamber and firetubes to all be removed from the boiler shell as one unit, simplifying manufacture and maintenance. Although a valuable feature, this became impractical for larger diameter chambers that would require the support of the shell. Variants [ ] Number of furnaces [ ] Typical practice for ships was to have two furnaces in each boiler. Smaller boilers might only have one, larger boilers commonly had three. The limitation in boiler size was the amount of work each stoker could do, firing one furnace per man. Larger ships (meaning anything above the smallest) would have many boilers. As with the, the furnace was often corrugated for strength. Various makers had their own particular ways of making these corrugations, leading to their classification for maintenance purposes under the broad titles of,, Morrison,, Purves or Brown. Wet back and dry back [ ]. Cross and longitudinal section of a four-furnace boiler The typical design is the 'wet back', where the rear face of the combustion chamber is water-jacketed as a heating surface. The 'dry back' variation has the rear of the combustion chamber as an open box, backed or surrounded only by a sheetmetal jacket. This simplifies construction, but also loses much efficiency. It is only used for small boilers where capital cost outweighs fuel costs. Although the Scotch boiler is nowadays rarely the primary steam generator on a ship, small dry-back designs such as the Minipac are still encountered, for supporting secondary demands whilst alongside in port with the main boilers cold. ![]() One interesting variant of the dry-back design has been a patent for burning ash-prone fuels. The rear of the combustion chamber is used as an access point for an ash separator, removing the ash before the small-diameter tubes. Double-ended [ ] The double-ended design places two boilers back-to-back, removing the rear wall of the boiler shell. The combustion chambers and firetubes remain separate. This design saves some structural weight, but it also makes the boiler longer and more difficult to install into a ship. For this reason they were not commonly used, although back-to-back arrangements of multiple single-ended boilers were common. Inglis [ ] The ' modification adds an extra combustion chamber where an additional single large flue returns from the rear to the front of the boiler. Flow through the multiple tubes is thus from front to back, and so the exhaust is at the rear.
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