are assembled the support in which a ship rests

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Unformatted text preview: shaped top of a ventilator pipe. 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, cargo, etc. 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 wedge. 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 for launching. 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 stiffness. 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' material. 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; assembling...
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