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Steamships
For example, on the Titanic the propulsion boilers were heated by burning coal. 6,611 tons of coal were carried in its official bunkers, with a further 1,092 tons carried in Hold 3. The furnaces required over 600 tons of coal a day to be shoveled into them by hand, requiring the services of 176 firemen working around the clock.[1]
Furnaces
Fuel oil depots built in reinforced concrete and heated with steam to maintain a minimum temperature of 140°F and pump it to other heat exchangers in the boiler building.