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Drilling Rigs - Semi-Submersible

A Semi-submersible platform or rig, is a mobile structure used for drilling for oil and natural gas in offshore environments. Their superstructures are supported by columns sitting on hulls or pontoons which are ballasted below the water surface. They provide excellent stability in rough, deep seas. Semi-submersible rigs can be moved from place to place; and can be ballasted up or down by altering the amount of flooding in buoyancy tanks; they are generally anchored by cable anchors during drilling operations, though they can also be kept in place by dynamic positioning. Semi-submersibles can be used in depths from 600 up to 35,000 feet (180 to more than 10,600 m).
BORGLAND DOLPHIN - Drilling rig BORGLAND DOLPHIN, imo:8758469/1977. Builder Harland & Wolff (Conversion), Belfast, Ireland: Major up...
Borgsten Dolphin. Arriving in the Cromarty Firth on 26th October 2010. Assisted by Tugs UOS Endearvour & Havila Saturn...
Borgsten Dolphin. Cromarty Firth, October 2010.
Noble Ton Van Langeveld. Cromarty Firth, November 2010.
GSF Artic IV Photo taken November 2010 just before she went to dry dock in Poland. Photo taken from Maersk Logger
SEMI-2 SEMI-2, imo:8518302, at CCB Ågotnes, July 15. 1993
SEMI-2 SEMI-2, imo:8518302, at CCB Ã…gotnes, July 15. 1993
Cape Town Harbour, South Africa Image taken from the top of the Deepwater Horizon's Derrick on the 3rd of March 2007. The two oil ri...
Pride South Seas Picture of the Pride South Seas taken in Port while she was getting some maintenance work done inclu...
Wimps ride inside, REAL men outside. I include this pic to show how oldtimers among us travelled via the Billy Pugh. Sedco 704 decommissi...
SAFE GOTHIA - Accomodation Platform SAFE GOTHIA in Bergen, November 6.1993

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