Wisdom

"The biggest satisfaction in life is to succeed doing something that others think you are not able to do so."

Saturday, January 21, 2012

Bottom Construction : Keel

The keel runs along the centerline of the bottom plating of the ship and for the majority of merchant ships is of a flat plate construction. At right angles to the flat plate keel, running along the ship's centerline from the fore peak to the aft peak bulkhead, is a watertight longitudinal division known as the center girder or vertical keel . This provides considerable strength to the structure an resistance to bending.
 

Some double bottoms have a duct keel fitted along the centerline. No duct keel is necessary in the machinery space or aft of it. The construction of the duct keel uses two longitudinal girders spaced not more than 2.0 m apart. Stiffeners are fitted to shell and bottom plating at alternate frame spaces and are bracketed to the longitudinal girders. The keel plate and the tank top above the duct keel must have their scantlings increased to compensate for the reduced strength of the transverse floors.

 

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