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Ocean Alliance
Oil Rig Photos
No: 318   Contributor: Andrew Dowsett   Companies: Diamond Offshore   Year: 1988
Ocean Alliance

Ocean Alliance in the Cromarty Firth, prior to completion work carried out at Invergordon.
Picture added on 04 April 2007
add commentComments:
Notice the large boyancy tanks attatched to the front of the columns - ths was an afterthought. Someone got jittery about stability, fitted 3 months before handover got lots of overtime on that one. £7.00 an hour was a fortune in them days.

Added by GRANT ELDER on 26 March 2008.
This is the rig that ended the 200 year career of Scott Lithgow. The weld spec called for zero porosity, lots of rework, and the complex outfitting of the pontoons and columns extended the job to about seven years in total. The construction was taken over by Trafalgar and they poured money into it. This excellent yard had previously completed a much smaller but equally complex semi, called Iona? or something like that? I visted the small one on a cold wet day in January-imagine Greenock on a cold wet windy day with the workers outside on the main deck!

Added by Craig Lang on 04 November 2008.
Think the smaller equally complex one was the "Iolair" built for use in the BP Forties field, she went on to be sold to Reading and Bates and then was taken over by Transocean. She worked on the Fionaven and frequently came into the Firth to collect equipment from Invergordon supply base, last I heard she was "down Mexico way".

Added by Duncan Murray on 14 November 2008.
I think it would be very informative and useful to show the complexity of the internal outfitting and the problems the builders faced just in accessing locations in the pontoons and columns. Internal outfitting is due to instability, better to increase size and capacity and keep out of the pontoons.

Added by Craig Lang on 20 March 2016.
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