Ships Nostalgia - View Single Post - Boiler probably of the 19th century
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Old 6th December 2019, 20:50
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spongebob spongebob is offline
Organisation: Merchant Navy
Department: Engineering
Active: 1957 - 1961
Join Date: Dec 2007
Posts: 9,019
For many years now the scotch marine style boilers and their modern three pass wet back versions have been of single furnace tube design for steaming capacities up to 35,000 to 40,000 lbs/hr evaporation .
Twin or triple furnace design is unnecessary due to no need to burn down fire beds and remove ash while maintaining steaming rates and the fact that the removal of the furnace grate , fire bars, or stoker appliance allows the entire diameter of the furnace tube to act as a primary heating surface instead of only about 50% availability when firing solid fuels .
I know of only one installation in NZ that was new built as a twin furnace oil fired unit and that was about 1959 at NZ Lion Breweries in Khyber Pass Auckland and that was because the chief engineer feared a further world war that would deny him oil fuel.

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