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Glossary of Marine Terms N-T

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Marine terms, ship construction, dockyard, national flag, net capacity tonnage, nrt, obo ship, oil tanker, open registry, ore carrier, ore-bulk-oil carrier, outboard, panamax, panting, panting frame, parallel , middle body, passenger ship, period of roll, pilot house, pintles, poop, port, product carrier, quarters, rake, reefer container, roro ship, rudder stock, rudder stop, s.s., s/t, sagging, scuppers, scuttle, sea chest, sea trials, sea worthiness, seabee, seaworthiness certificate, self-sustaining ship, self-trimming ship, self-unloader, sheer strake, shell expansion plating, shelter deck, shifting board, shore, short ton, sister ships, skeg, skylight, slop tank, sounding pipe, sparring, spectacle frame, stability, starboard, stealer, stem, stern frame tube clearwater cruiser transom, sternpost, sternway, stiff, stiffness, stiffener, store, stowage, stranding, strength deck, stringer, stringer bar, swash bulkhead plate, t.e.u., tail shaft, tank-barge, tanker, tender, test head, tonnage deadweight gross net openings, transom beam frame, trim, trimaran, tripping bracket, tug, tumblehome, tween deck

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Marine and Naval Architecture terms have special meaning. Persons studying ship construction, working on board ship, or dockyard will find these pages useful.

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NATIONAL FLAGThe flag flown by a ship to show her nationality.
NET CAPACITYThe weight of cargo which a vessel can carry when loaded in salt water to her summer freeboard marks. Also called cargo carrying capacity, cargo deadweight, useful deadweight.
NET TONNAGESee Tonnage (Net)
NRTNet registered tons. See Tonnage (Net)
OBO SHIPA multipurpose ship that can carry ore, dry bulk goods and oil.
OIL TANKERA ship designed for transporting oil in bulk
OPEN REGISTRYSee "flag of convenience" or "flag of necessity"
ORE CARRIERA large ship designed for the transportation of ore.
OUTBOARDAway from, the centerline towards the side; outside the hull
PANAMAXA vessel designed small enough for passage through the Panama Canal
PANTINGThe pulsation in and out of the bow and stern plating as the ship alternately rises and plunges deep into the water
PANTING FRAMEThe frames in the forward and after portions of the hull framing to strengthen against shell panting
The amidships portion of a ship in which the contour of the underwater hull form is unchanged
PASSENGER SHIPA ship authorized to carry more than twelve passengers.
PERIOD OF ROLLThe time occupied in performing one complete roll of a ship as from starboard to port and back to starboard
PILOT HOUSEThe enclosed space on the navigating bridge from which a ship is controlled when under way. See bridge
PINTLESThe pins or bolts that hinge the rudder to the gudgeons on the rudder post or sternpost
POOPA superstructure fitted at the after end of the upper deck
PORTThe left-hand side of a ship when facing forward
PRODUCT CARRIERA tanker used to carry refined oil products. Normally four different grades of oil can be handled simultaneously.
RAKEFore-and-aft inclination from the vertical
REEFERA ship designed for carrying goods requiring refrigeration
REEFER CONTAINERAn insulated container fitted with a refrigeration unit for carrying cargo requiring temperature control
RO/RO SHIPCargo or ferry ship on which trucks and other vehicles can be driven on and off on ramps through large openings at the bow, stern or side
RUDDER STOCKA vertical rudder shaft that connects to the steering gear
RUDDER STOPA stout bracket to limit the swing of the rudder to the maximum 37 degree starboard or port
S/TShort tons (2,000 lbs.).
SAGGINGStraining of the ship that tends to make the middle portion lower than the bow and stern (See hogging)
SCUPPERSDrains from decks to carry off accumulations of rainwater, condensation or seawater
SCUTTLEA small circular or oval opening fitted in decks to provide access
SEA CHESTAn opening for supplying seawater to condensers, pumps, etc. located in the hull below the waterline and having means for the attachment of the associated piping
SEA TRIALSA series of trials done at sea to determine whether the ship has met the specifications of design, modification, or repair
SEA WORTHINESSThe condition of a vessel with regards to materials, construction, equipment, crew and outfit which is considered safe for the trade in which it is employed
SEABEEA self-propelled sea barge larger than the "LASH" but using rollers to move aboard the ship
A certificate issued by a classification society surveyor allowing a vessel with a mishap affecting its seaworthiness to proceed to another port where permanent repairs can be carried out.
SELF-SUSTAINING SHIPA containership fitted with her own crane for loading and discharging containers
SELF-TRIMMING SHIPA ship whose cargo holds are shaped so that the cargo levels by itself.
SELF-UNLOADERA bulk carrier which is equipped with cargo unloading gear
SHEERThe longitudinal curve of a vessel's decks in a vertical plane. Due to sheer, a vessel's deck height above the baseline is higher at the stem and stern than at amidships
SHEER STRAKEThe course of shell plating at strength deck level
SHELL EXPANSIONA plan showing the seams and butts, thickness and associated welding or riveting of all plates comprising the shell plating, framing, etc.
SHELL PLATINGThe plates forming the outer side and bottom skin of the hull
SHELTER DECKA superstructure deck fitted continuous from stem to stern and fitted with at least one tonnage opening
SHIFTINGMoving the ship to suit the location of shore cargo loading gear
SHIFTING BOARDPortable bulkhead members, generally constructed of wood planking and fitted fore and aft in cargo holds when carrying grain or other cargo to prevent shifting when the ship is rolling
SHOREA brace or prop used for support while building a ship
SHORT TON2,000 pounds.
SISTER SHIPSShips built on the same design.
SKEGA deep, vertical, finlike projection on the bottom of a vessel near the stern
SKYLIGHTA glass covered framework fitted over a dock opening for admitting light and air into the compartment below
SLOP TANKA tank in a tanker into which the residue of tank washing are pumped.
SOUNDING PIPEA pipe leading to the bottom of an oil or water tank, for guiding a sounding tape or jointed rod when measuring the depth of liquid in the tank
SPARRING(See Cargo battens)
SPECTACLE FRAMEA large casting extending outboard from the main hull for supporting for the ends of the propeller shafts in a multi-screw ship
STABILITY The ability of a ship to return to her normal upright position when listed by the action of waves, wind, etc.
STARBOARDThe right-hand side of a ship when facing forward
STEALERA single wide plate that is butt-connected to two narrow plates, usually near the ends of a ship.
STEMThe upright bow frame forming the apex of the intersection of the forward sides of a ship
STERN FRAMELarge casting attached to th after end of the keel, incorporating the rudder gudgeons and propeller post in single-screw ships
STERN TUBEThe watertight tube enclosing and supporting the propeller shaft on bearings
STERN, CLEARWATERA stern with a "shoeless" stern frame
STERN, CRUISERA spoon-shaped stern used an most merchant ships designed to give maximum immersed length
STERN, TRANSOMA square-ended stern used to provide additional hull volume and deck space aft and to decrease resistance in some high speed ships.
STERNPOSTThe vertical part of the stern frame to which the rudder is attached
STERNWAYThe reverse movement of a vessel. See astern
STIFF, STIFFNESSA stiff ship is one which have a short period of roll and therefore will roll uncomfortably
STIFFENERAn angle, T-bar channel, built-up section etc, used to stiffen plating of a bulkhead, etc.
STOREA general term for provisions, materials and supplies used aboard ship
STOWAGEThe placing of goods in a ship in such a way as to ensure the safety and stability of the ship
STRANDINGThe running of a ship on shore on a beach.
STRENGTH DECKThe deck that is designed as the uppermost part of the main hull longitudinal strength girder
STRINGERA fore-and-aft girder running along the side of a ship at the shell and also to the outboard strake of plating on any deck
STRINGER BARThe angle connecting the deck plating to the shell plating or to the inside of the frames. The strength deck stringer bar is usually called the gunwale bar
SWASH BULKHEADLongitudinal or transverse nonwatertight bulkheads fitted in a tank to decrease the swashing action of the liquid contents as a ship rolls and pitches at sea
SWASH PLATEA plate serving the purpose of a swash bulkhead, but not extending to the bottom of the tank
T.E.U.Twenty Foot Equivalent Unit for containers. See containers
TAIL SHAFTThe ship's propeller shaft
TANK-BARGEA river barge for the carrying of liquid bulk cargo
TANKERShip designed for transporting liquid cargo, usually petroleum products
TENDERA tender ship is one which have a long period of roll but may list excessively in a strong wind and may be dangerous if a hold is flooded following a collision
TEST HEADThe head or height of a column of water which will give a prescribed pressure on the vertical or horizontal sides of a compartment or tank in order to test its tightness, or strength
TONNAGE (GROSS)Gross tonnage includes a ship's internal volume, excluding such spaces as the peak, double bottom, deep tanks used only for water ballast, bridge, forecastle, open-ended poop, certain light and air spaces, skylights, anchor and steering gear spaces, toilets, the wheelhouse, and certain passenger spaces
TONNAGE (GROSS, NET)A measure of the internal volume of spaces within a vessel in which 100 cu.ft.. is 1 ton
TONNAGE (NET)Net tonnage is the gross tonnage less certain additional spaces such as crew and officer spaces, chart room, and a percentage of the propelling machinery spaces; also see deadweight, displacement, light and displacement, loaded
TONNAGE OPENINGSNonwatertight openings in the shelter deck and in the ''tween deck bulkheads immediately below in order to exclude spaces from tonnage measurement and thus obtain reduced gross and net tonnage. The openings could be closed by nonwatertight wood shifting boards or metal covers meeting the tonnage and load line regulations
TRANSOM BEAMThe aftermost transverse deck beam
TRANSOM FRAMEThe aftermost transverse side frame
TRIMThe difference between the draft forward and the draft aft. A ship is trimmed by adjusting the location of fuel, cargo, ballast, etc.
TRIMARANA triple hulled vessel
TRIPPING BRACKETFlat bars or plates fitted at various points on deck girders, stiffeners, or beams as reinforcements to prevent their free flanges from tripping
TUGA boat equiped with powerful engines for towing or pushing large ships or barges
TUMBLEHOMEInboard slope of a ship's side above the designed waterline
TWEEN DECKThe space between any two adjacent decks

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