Ofon : Offshore living quarters for Total
For Eiffage Métal and its subsidiary Eiffel Nigeria, 2014 marked the high point in a major project, the construction and hook-up of the living quarters for the Ofon offshore oil platform off the coast of Port Harcourt in Nigeria. The company’s teams built, delivered and installed on behalf of Total and the Nigerian National Petroleum Company, what is in effect a 7,000 ton floating hotel (weighing the equivalent of the Eiffel Tower), where 127 people are now able to live and work.
The living quarters are made up of four stacking modules that sit on a fixed jacket anchored in 34 metres of water. Construction, which began in June 2011 and was completed in late December 2013, was carried out simultaneously at sites in Fos-sur-Mer (Bouches-du-Rhône) in France and Lagos and Port Harcourt in Nigeria at the Nigerdock and Aveon Offshore yards. It took twenty months for the Fos yard to build the technical decks, two modules weighing 1,300 and 1,200 tons respectively. In Nigeria, approximately 4,000 tons of structured steel were produced, requiring 2.5 million manpower hours.
Towards the end of 2013, Saipem began installing the jacket, carrying out the pile driving activities and installing the modules. Then in 2014, teams from Eiffage Métal carried out the offshore hook-up, in other words the connection and start-up works, as well as commissioning and start-up tests. 60 km of cables, 800 pipe sections and numerous ventilation ducts were installed over a period of eleven months by 300 workers working in rotation at the offshore site. These works necessitated 500,000 manpower hours.
This is the first time that offshore living quarters have been partially built in Nigeria (150 expatriate employees were drafted in to assist the Nigerians). All the targets and deadlines were met. The quality of the construction meets European standards. There were no accidents resulting in lost work days.