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93. What is the name of an internal passage of watertight construction fitted along the centerline between the double bottoms of some ships, usually from the forepeak to the forward machinery space bulkhead, used to carry pipe work along the length of the ship to the various holds or tanks?
A duct keel is a watertight passage within a ship's double bottom, running along the centerline and used to carry pipes. This structure differs from a vertical keel, which is a structural member, and a bar keel, which is an external keel; 'pipe keel' is not a recognized term.
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