SHIP TERMS

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SHIP TERMS

LENGTH OVERALL (LOA)         

                The distance from the extreme forward part of the ship to the extreme aft of the ship is known as length overall. It is the greatest length of the ship. This length is important when docking.

LENGTH BETWEEN PERPENDICULARS (LBP)

            The distance between the forward perpendicular and aft perpendicular measured along the summer load line. 

FORWARD PERPENDICULAR (FP)

                It is a perpendicular drawn at the point where the fore side of the stem meets the summer load line.

AFT PERPENDICULAR (AP)

                It is a perpendicular drawn at the point where the aft side of the rudder post meets the summer load waterline.

BREADTH EXTREME (B.Ext)                                                                                                           

                The greatest breadth of the ship, measured to the outside of the shell plating.

BREADTH MOULDED (B. Mld)

               The greatest breadth of the ship, measured to the inside of the inside strakes of shell plating.

DEPTH EXTREME (D. Ext)

              The depth of the ship measured from the underside of t6he keel to the top of the deck beam at the side of the uppermost continuous deck amidships.

DEPTH MOULDED (D. Mld)

              The depth measured from the top of the keel to the underside of the deck measured at midships at the ship’s side.

DRAUGHT EXTREME (d. Ext)

             The distance from the bottom of the keel to the water line. The load draught is the maximum draught to which a vessel may be loaded.


DRAUGHT MOULDED (d. Mld)

             The draught measured from the top of the keel to the waterline.

MIDSHIPS
                              
                It is a point midway between the forward and aft perpendiculars.

FREEBOARD

             The distance from the waterline to the top of the deck plating at the side of the deck amidships.

CAMBER OR ROUND OF BEAM

                The transverse curvature of the deck from the centerline down to the sides. This camber is used on exposed decks to drive water to the sides of the ship.

SHEER

                The curvature of the deck in a fore and aft direction, rising from midships to a maximum at the ends. The sheer is used to drive the water out of the ships at midships.

RISE OF FLOOR

                The bottom shell of a ship is sometimes sloped up from the keel to the bilge to facilitate drainage. This rise of floor is small, 150 mm being usual.

BILGE RADIUS

                The radius of the arc connecting the side of the ship to the bottom at the midship portion of the ship.

TUMBLE HOME

                Tumble home is the inward curvature of the side shell above the waterline.

BASE LINE

                It is a horizontal line drawn at the top of the keel plate.

FLARE

                Flare is the outward curvature of the side shell above the waterline at the forward end of the ship.




Displacement
          
                The mass of the ship and everything it contains. A ship has different values of displacement at different draughts.

Lightweight

               The mass of the empty ship without stores, fuel, water, crew or their effects.

Deadweight

                The mass of cargo, fuel, water, stores, etc., a ship carries. The deadweight is the difference between the displacement and the lightweight.

BUOYANCY

                Watertight volume below the waterline of the ship is called buoyancy.

RESERVE BUOYANCY

                 Watertight volume above the waterline of the ship is called reserve buoyancy.




                                                                          *******

Comments

  1. Unknown24 October 2018 at 05:19

    Steel Wire rope is always known for reliable and safe usage at the workplace. With its sturdy construction and heavy duty features, it s used in pulling machines for various operations where utmost safety is required.

    ReplyDelete
  2. Anvesh Bhat4 June 2019 at 11:19

    thank you.

    ReplyDelete

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