Yarrow water tube marine steam boiler
A marine water tube boiler employing 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 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
steam drum.
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