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The Berengaria, originally the Imperator, was built in 1912 by The Vulcan Company, of Hamburg for the Hamburg-America Line. She was 919ft. in length, 98ft in breadth, had a moulded depth of 63ft., and a gross tonnage of 52,000 tons. Her boiler installation consisted of forty-six Yarrow type water-tube boilers arranged in four rooms, each 75ft long, which extended over the whole width of the ship when newly constructed oil storage tanks replaced the coal bunkers. The conversion was carried out in 1921-2 by Armstrong Whitworth
A considerable amount of structural alteration had been necessary in order to effect this conversion as well as to fit new boiler fronts and burners and the necessary installation of pumps and piping.
Read more about the ship's dimensions in The Engineer 1922/05/12.