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Classification of an offshore raised structure. 
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| Group: marine
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| Status: de facto
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Classification of an offshore raised structure.
Categories
| Category (CATOFP)
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seamark:platform:category
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Definition
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| Oil derrick/rig
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oil
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A temporary mobile structure, either fixed or floating, used in the exploration stages of oil and gas fields.
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| Production platform
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production
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A term used to mean any permanent offshore structure equipped to control the flow of oil, gas, or electricity.
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| Observation/research platform
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observation
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A platform from which one's surroundings or events can be observed, noted or recorded such as for scientific study.
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| Articulated loading platform (ALP)
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alp
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A metal lattice tower, buoyant at one end and attached at the other by a universal joint to a concrete filled base on the sea bed. The platform may be fitted with a helicopter platform, emergency accommodation and hawser/hose retrieval.
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| Single anchor leg mooring (SALM)
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salm
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A rigid frame or tube with a buoyancy device at its upper end , secured at its lower end to a universal joint on a large steel or concrete base resting on the sea bed, and at its upper end to a mooring buoy by a chain or wire.
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| Mooring tower
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mooring
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A platform secured to the sea bed and surmounted by a turntable to which ships moor.
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| Artificial island
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artificial_island
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A man-made structure usually built for the exploration or exploitation of marine resources, marine scientific research, tidal observations, etc.
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| Floating production, storage and offloading vessel (FPSO)
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fpso
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An offshore oil/gas facility consisting of a moored tanker/barge by which the product is extracted, stored and exported.
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| Accommodation platform
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accommodation
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A platform used primarily for eating, sleeping and recreation purposes.
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| Navigation, communication and control buoy (NCCB)
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nccb
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A floating structure with control room, power and storage facilities, attached to the sea bed by a flexible pipeline and cables.
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