It consist of two center girder Why Duct keel has advantage over other types of keel It runs from collision bulkhead to forward engine room bulkhead Duct Keelĭuct keel is used in double bottom hull ships and consists of solid plates joint together into a box shape and it allows pipes and other required services to pass throughout the length of the keel(watertight) from forward to aft. In double bottom hull- Flat plate keel forms a strong ‘I’ section with the vertical plate commonly called the centre girder and the horizontal plate being part of the tank top. The vertical plate is known as Keelson plate, and the vertical plate above is known as the Rider plate. In single bottom hull – Flat keel plate forms an ‘I’ section with a vertical longitudinal centreline plate on top of it and a horizontal plate above the longitudinal beam. The centre girder is attached to the keel and inner bottom plating by continuous welds and there is no scallops in this connection.įlat plate keel can be used with the single bottom hull or double bottom hull. It is a solid plate attached to supporting plates it must be thicker than the adjoining plates

This type of keel is prefer in modern time and is used by all sea going vessels Flat Keelįlat keel is used in single bottom ships. Steel plates on either side of the bar keel are known as gar-board strake. It is mostly used for Ferries, tugs, and boats where they are more exposed to grounding risk.Ī bar made up of steel is placed in the centre of the keel called bar keel.īar keel is stronger and heavier than the flat keel. Ship in Dry Dock Sitting on Blocksįirst type of keel which is used since the first iron type of ship is built Keel is also called as back bone of a ship as it is the main part of the ship Keel is the bottom most plate of a ship and usually very thick in size as whole ship structure sits on this plate, also refers as center-line, the construction of ship starts from here. Some of the terms used in Keel Construction.

Why Duct keel has advantage over other types of keel.

Margin plate ship construction