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   G
G (Golf)
I require a pilot
Gas Lift The technique of mixing gas into the oil flow in order to enhance the flow.
Gas Oil Ratio
The ratio between the produced gas in cubic feet, and the oil measured in barrels.
Gas Re-Injection
Secondary Recovery Technique with the re-injection of "dried" and condensate-free gas to maintain pressure in the reservoir.
Gas tanker Special ship for the transportation of condensed (liquid) gases. The most important cargoes are: -LNG - Liquefied Natural Gas (mostly methane). -LPG - Liquefied Petroleum Gas (propane, butane). -Ammonia. -Ethylene. On board, gases are kept liquid with highly effective insulation (thermos bottle-principle), by high pressure or by low temperature. LNG-ships must be able to carry cargoes with temperatures as low as -163°C.
Gas Well
The discovery of hydrocarbons with a high Gas Oil Ratio.
GATS General Agreement on Trade in Services - part of GATT - concerns trading in services, incl. shipping.
GATT General Agreement on Tariffs and Trade (Geneva).
GBS Gravity Base Structure
GCBS General Council of British Shipping - the amalgamation of the former BSF - British Shipping Federation - and the UK Chamber of Shipping, established 1976.
General cargo Goods unpackaged or packaged, but not shipped in bulk.
Geological Survey
Detailed investigation for structure and type of sediment.
GEOROT Geographical Rotation - sequence in which ship calls at ports on her itinerary.
GIS German International Shipregister
GL Germanischer Lloyd - German classification society.
GMDSS Global Maritime Distress and Safety System
Gooseneck
Curved section of pipeline where the drill mud reaches the flexible hosepipe for further transportation to the swivel.
Grain Cap Grain Capacity - a ship's grain-carrying capacity.
Gravity Structure
Platform firmly placed on the seabed without any special fastenings due to its high specific gravity. Several gravity structures have been installed in deep parts of the North Sea.
Gross Tonnage GT (0.2+0.02·log10V)·V, where V is the volume in cubic metres of all enclosed spaces on board.
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