page_title: Launch-type boiler
section_title: Lancashire & Yorkshire Railway
hierarchical_section_title: Launch-type boiler / Railway locomotives / Lancashire & Yorkshire Railway
caption_attribution_description: English: No. 114 built at Horwich with a cylindrical firebox
context_page_description: A launch-type, gunboat or horizontal multitubular boiler is a form of small steam boiler. It consists of a cylindrical horizontal shell with a cylindrical furnace and fire-tubes within this.
  Their name derives from the boiler's popular use at one time for small steam yachts and launches. They have also been used in some early Naval torpedo boat destroyers.
context_section_description: The Lancashire & Yorkshire Railway suffered problems with firebox stays, leading to a boiler explosion with an 0-8-0 'Class 30' near Knottingley in 1901 Their Chief Mechanical Engineer Henry Hoy, sought to avoid the problems of the stayed firebox altogether and so developed an alternative boiler and firebox. This used a corrugated tubular furnace and cylindrical outer firebox, as for the Lentz. Such corrugated furnaces were already in widespread use locally, with the Lancashire and Galloway stationary boilers of the Lancashire cotton mills and local makers already had several designs available. The furnace was also of steel, rather than the copper used for fireboxes at this time. Hoy's involvement was ironic, as a major cause of the original accident had been Hoy's invention of a new brass alloy for firebox stays, an inelastic alloy that turned out to have serious drawbacks. One Class 30, 396, was rebuilt in 1903 and 20 more were built new with this boiler.
  In service the boilers showed a number of drawbacks. They were slow to warm up after lighting and the limited ashpan space limited their working time away from the shed. Both of these were as a result of the furnace heating area largely being shielded by the grate across it. It has been suggested that they would have been more successful with oil firing, as this would have allowed the whole furnace diameter to have been used and would have avoided ash build up.
  The new boiler design did not last long in service and the locomotives were rebuilt with conventional boilers after ten years. Hoy's successor, George Hughes, described these boilers unfavourably in papers read to the I. Mech E..
caption: L&YR 0-8-0 with cylindrical furnace
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