page_title: Yarrow boiler
section_title: Marine use
hierarchical_section_title: Yarrow boiler / Marine use
caption_attribution_description: Water Tubular Marine Boilers placed as on Vessel English: A flat of three Yarrow boilers, assembled in Yarrow's works before delivery. A painted caption reads "Yarrow boilers for Chilian (sp. Chilean) Battleship". Spelling of "Chilian" is original
context_page_description: Yarrow boilers are an important class of high-pressure water-tube boilers. They were developed by
  Yarrow & Co., Shipbuilders and Engineers and were widely used on ships, particularly warships.
  The Yarrow boiler design is characteristic of the three-drum boiler: two banks of straight water-tubes are arranged in a triangular row with a single furnace between them. A single steam drum is mounted at the top between them, with smaller water drums at the base of each bank. Circulation, both upwards and downwards, occurs within this same tube bank. The Yarrow's distinctive features were the use of straight tubes and also circulation in both directions taking place entirely within the tube bank, rather than using external downcomers.
context_section_description: HMS Hornet (1893), a Havock class destroyer. HMS Havock (1893), the lead ship of the class, was built with the then current form of locomotive boiler, Hornet with a Yarrow boiler for comparison.
  The first Yarrow boilers were intended for small destroyers and filled the entire width of the hull. In the early classes, three boilers were used arranged in tandem, each with a separate funnel. The later sets supplied for capital ships used multiple boilers and these were often grouped into sets of three, sharing an uptake.
caption: Triple group of boilers for a Chilean battleship
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