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Cradle ----A form on which bows, etc., are
assembled. The support in which a ship rests
during launching; a launching cradle.
Crossheader ----A pipeline that crosses over a
tank providing a transit for cargo without tying
into the vessel.
Cyclodial propulsion system ----A system of
vertical blades that have taken the place of
propellers for propulsion in some applications.
Made by Voith Hydro GmbH & Co..
Generically referred to as a "tractor system". Compartment ----A subdivision of space or
room in a ship.
Corrugated ----Having a series of wrinkles or
grooves arranged so as to produce stiffness.
Corrugated Bulkheads ----Bulkheads with
corrugated plating, eliminating the need for
many welded stiffeners. Five blades
of a Voith Tractor system. D
Davit ----A crane arm used in handling small
boats, lifeboats, stores, gear, etc.
Dead Flat ----A portion of a ship's side or
bottom where the plating has no curvature; also,
the midship portion of constant cross section.
(The parallel middle body.)
Dead Man ----A buried timber (etc.) that has an
attached pipe or cable going to the surface for
the purpose of securing a vessel at a dock or
along a riverbank. E6002 – Ship Terms & Definitions p. 8 © C.G.Daley Depth ---- The height of the ship at the midship
section from the base line to the moulded line of
the deck at side (underneath).
Derrick ----A device for hoisting heavy weights,
Die ----A tool for forming a rivet head (applied
to rivet dies). This pipe is attached to a dead man under the
ground, and the vessel is attached to the cable
going to the left.
Dead Rise ----The rise or upward slant of the
bottom of a ship from the keel to the bilge. It is
the difference in height between the base line
and the point where the straight line through the
bottom flat surface intersects the vertical line
through the side of the moulded surface at its
widest point. (See A and B in Fig. 1; also, Fig.
3) BEAM -- The width of-the ship (moulded
surface) at the widest point. (See Fig. 3) Displacement ----The total weight of the ship
when afloat, including everything on board,
(equals weight of water displaced.) Usually
expressed in long tons.
Dog ----A small bent metal fitting used in
closing doors, hatch covers, manhole covers,
etc.; a bent bar of round iron used in holding
shapes on bending slab; any small flat lug
temporarily welded to structure as backing for a
Dolly Bar ----A heavy bar to hold against a
rivet, to give backing when riveting.
Double Bottom ----Compartments at bottom of
ship between inner and outer bottoms, used for
ballast tanks, water, fuel, oil, etc. The double
bottom extends from the flat keel to the tank top.
It is strongly constructed and is water tight so
that in case of accident causing an inrush of
water into the double bottom, the ship would
still be able to keep afloat. The principal parts of
the double bottom are the flat keel, vertical keel,
floors, intercostal girders, bilge, brackets, tank
top, longitudinals, bounding bars and angle
clips. Deadweight----The total weight of cargo, fuel,
water, stores, passengers and crew, and their
effects, which a ship can carry.
Deck ----A part of a ship corresponding to the
floor of a building.
Deck-House ----A shelter built on deck.
Declivity ----Inclination of shipways to provide
Deep Tank ----A deep compartment usually
extending from tank top to lower deck. Frames in the void wing tank of a river barge.
In this photo, the knuckle plate has been cut
away so that bent frames can be renewed. The
double bottom is exposed. New knuckle plate
will be installed once the frames are renewed. E6002 – Ship Terms & Definitions p. 9 © C.G.Daley The USCG inspects all phases of tank barge
repair and construction. This wing tank will be
pressurized with air and each seam will be
sprayed with a soap mixture to check for the
smallest of leaks. The hulls of tank barges are
literally air tight.
The first 'bottom' may be the one that contacts
the water and a void space and the second
'bottom' may be the one that contacts the cargo
and the void space.
Doubling Plate ----A plate fitted outside or
inside of another to give extra strength or
Drag ----The amount the stern end of the keel is
below the bow end when the ship is afloat, but
not on an even keel.
Draft ----The vertical distance of the lowest
point of the ship below the surface of the water,
when afloat. Draft marks are the painted
numbers on the side of a vessel. E
Erecting ----The process of hoisting into place
and bolting the various parts of a ship's hull.
Even Keel ----A ship is said to be on an even
keel when the keel is level or parallel to the
surface of the water.
Expansion Trunk ----Raised portion of tank
used on some oil tankers to allow for the
expansion of oil when temperature changes.
Eye Bolt ----Bolt whose head is in the form of a
ring or eye. F
Fabricate ----To make assemblies from 'raw'
Face Plate ----A narrow stiffening plate welded
alone the edge of any web frame or stiffener.
Fairing or Fairing Up ----Correcting or fairing
up a ship's lines or structural members;
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- Winter '14