Visual reference | 63 registered terms

Ship structure and marine engineering glossary

Search the same registered terminology used by the 3D model. Every definition states what the term means and opens the corresponding modeled object, space, plating region, system, or item of equipment.

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Exterior and hull form

Outer shell platingPlating: The continuous watertight plating that encloses the hull, including side, bilge, bottom, bow, and stern regions.
Side shell platingPlating: The outer shell on the port and starboard sides, extending from the deck edge to the bilge transition.
Bottom shell platingPlating: The underwater shell extending from the centreline bottom into the lower bilge region.
Bilge platingPlating: The curved shell region where the bottom turns into the side; it is not a separately attached body.
Flat plate keelPlating strake: The strengthened centreline strake of bottom shell plating, normally flush with the surrounding shell.
Weather deck platingDeck plating: The plating of the uppermost continuous deck exposed to weather and supporting deck outfitting.
Bow shell platingPlating: The curved forward outer shell, excluding the narrow stem edge and the submerged bulbous bow region.
StemHull boundary: The foremost centreline boundary where the port and starboard bow shell plating meet.
Bulbous bowHull-form feature: The submerged forward projection formed continuously into the bow shell.
Stern shell platingPlating: The afterbody shell narrowing around the stern tube, propeller inflow region, and rudder.
PropellerPropulsor: The rotating propulsor that accelerates water aft to generate thrust.
RudderSteering equipment: The steering surface positioned behind the propeller in this single-screw arrangement.
Cargo deck pipingPiping system: Visible cargo-oil lines routed on the weather deck between tank connections, pumps, and manifolds.
Cargo manifoldPiping assembly: Grouped cargo-piping connection points used for shore loading arms or hoses, normally near midships.
Accommodation and navigation bridgeSuperstructure: The aft superstructure containing crew accommodation, service spaces, and the navigation bridge.
FunnelMachinery casing: The casing and outlet structure for machinery exhaust uptakes, located aft of the accommodation.

Structure and spaces

Cargo oil tanksCargo spaces: Oil-tight spaces in the cargo region, divided longitudinally and transversely by oil-tight boundaries.
Slop tanksCargo service spaces: Dedicated tanks for tank-washing water and oily residues, shown at the aft end of the cargo region.
Segregated wing ballast tanksBallast spaces: Seawater ballast spaces between the side shell and inner hull, segregated from cargo oil.
Double-bottom ballast tanksBallast spaces: Ballast spaces between bottom shell and inner bottom plating, subdivided by floors and girders.
Inner bottom platingStructural plating: The upper boundary of the double bottom and lower boundary of cargo tanks; also called the tank top.
Inner hull platingStructural plating: The longitudinal plating separating wing ballast spaces from cargo oil tanks.
Transverse oil-tight bulkheadsBulkhead plating: Oil-tight transverse boundaries dividing the cargo region into tank bays.
Longitudinal oil-tight bulkheadsBulkhead plating: Fore-and-aft boundaries dividing centre, port, and starboard cargo oil tanks.
Collision bulkheadWatertight bulkhead: The foremost main transverse watertight bulkhead, arranged to limit flooding after bow damage.
CofferdamsVoid spaces: Narrow empty spaces separating cargo oil spaces from incompatible or hazardous adjacent spaces.
Solid floorsPrimary supporting members: Deep transverse plate members in the double bottom, intersecting longitudinal girders.
Centre girderPrimary supporting member: The principal longitudinal double-bottom girder on the centreline above the flat plate keel.
Side girdersPrimary supporting members: Longitudinal double-bottom girders arranged on both sides of the centre girder.
Transverse web framesPrimary supporting members: Deep transverse members connecting deck, side, inner hull, and double-bottom structure into rings.
Inner-bottom longitudinalsSecondary stiffeners: Fore-and-aft stiffeners attached beneath inner bottom plating and supported by floors.
Deck longitudinalsSecondary stiffeners: Fore-and-aft stiffeners attached below the strength deck and supported by deck transverses.
Side-shell longitudinalsSecondary stiffeners: Fore-and-aft stiffeners attached to the inner face of the side shell in the cargo region.
Longitudinal-bulkhead stiffenersSecondary stiffeners: Fore-and-aft stiffeners attached to longitudinal oil-tight bulkhead plating.
Deck transversesPrimary supporting members: Deep transverse members below deck that support deck longitudinals and connect to web frames.
Connection bracketsConnection details: Reinforcing plates at structural intersections that improve load transfer and reduce stress concentration.
Lightening holesStructural openings: Permitted openings in floors or girders that reduce weight and may provide drainage or access.

Piping and safety systems

Cargo oil piping systemCO-100/120: Connected suction and discharge piping between cargo tanks, cargo oil pumps, deck lines, and manifolds.
Cargo tank branch linesCO-110: Branch pipes connecting individual cargo tank suctions to the cargo oil mains.
Cargo suction bellmouthsCO-BM: Flared suction inlets near tank bottoms that collect cargo oil into branch piping.
Cargo oil isolation valvesCO-VS: Valves used to select or isolate cargo tank branches and cargo oil mains.
Cargo oil pumpsCOP-01/03: Vertical centrifugal pumps drawing cargo oil from tank suctions and discharging to deck piping.
Segregated ballast piping systemWB-200/210: A dedicated seawater system connecting ballast pumps with double-bottom and wing ballast tanks.
Ballast pumpsBAP-01/02: Centrifugal pumps used to fill and empty segregated ballast tanks.
Cargo stripping systemCO-150: Small-bore piping and stripping equipment used to remove cargo remaining after main discharge.
Inert gas systemIG-300/310: The system that conditions and distributes inert gas to cargo tank vapour spaces.
Cargo tank vent risersPV-320: Vertical vent pipes connecting cargo tank vapour spaces to pressure/vacuum relief devices.
Pressure/vacuum valvesP/V: Relief devices protecting cargo tanks against excessive positive pressure or vacuum.
Deck fire mainFM-400/410: The seawater network supplying deck hydrants and monitors from machinery-space fire pumps.
Pipe supportsSUP: Structural supports transferring pipe weight, vibration, and thermal loads into ship structure.
Bulkhead penetration sleevesPEN: Welded sleeves and collars maintaining a watertight or oil-tight boundary at pipe crossings.

Machinery and shafting

Main propulsion engineM/E: The low-speed engine arrangement that supplies torque to the propulsion shaft line.
Propulsion shaftingSHAFT: Rotating shafting that transmits engine torque to the propeller.
Thrust bearingTB-01: The bearing that transfers propeller thrust from the shafting into the ship structure.
Line-shaft bearingLSB-01: A bearing supporting the propulsion shaft between the engine and stern tube while maintaining alignment.
Stern tubeST-01: The watertight structural tube through which the propeller shaft passes at the stern.
Auxiliary diesel generator setsD/G-01/02: Engine-driven alternator sets supplying shipboard electrical power during navigation and cargo operations.
Auxiliary centrifugal pumpsAUX-P: Generic training envelopes for machinery-space service pumps; no unverified duty is assigned.
Machinery-space platformsER-PLT: Permanent steel platforms and gratings providing access to machinery and valves.
Inclined access laddersER-LDR: Inclined steel ladders connecting machinery-space platform levels.

Electrical distribution

Main cable traysET-500: Ladder-type trays supporting segregated power and control cables through the vessel.
Main switchboardMSB: The principal distribution switchboard receiving generator power and feeding shipboard loads.
Deck junction boxesJB: Protected enclosures providing cable and signal junctions for deck equipment.

How to use a term responsibly

A glossary term identifies the modeled scope, not a vessel-specific approved design. Confirm construction, repair, operation, and survey decisions against the applicable general arrangement, structural drawings, system diagrams, manuals, class rules, and as-built records.