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Yarrow water tube marine steam boiler |
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 A Yarrow marine boiler consist of an upper steam drum connected by banks of inclined tubes to two lower water drums. All the tubes discharge below the water level in the upper drum. The outer tubes function as down comer and the inner tubs function as evaporating tubes. This causes violent circulation of the water in the boiler and separate downcomers are not needed. The furnace is placed between the lower drums and the flue gases flows between the tubes on both sides of the boiler steam drum. |
 The Yarrow boiler was widely used in the navy of many countries. Later models had bended tubes to improve the elasticity of the construction.  A small Yarrow boiler used in a navy launch. These longboats are used to transport passengers and luggage to the ships. |
© 2007 Lars Josefsson Steamesteem in a computerized worldMarine steam boilers today and yesterday