Max uptime for all assets OIL & GAS Siri Caisson permanent support project Customer: DONG Energy The project In December 2014, one of the largest projects in the history of the Wind, Oil and Gas Division in Semco Maritime was completed after 3½ years, the Siri Caisson Permanent support project. The project consisted of an installation task of mounting three winch platforms to the three legs under the topside of DONG Energy’s Siri platform, which should be used as work and installation platforms on a temporary basis. Each of the platforms weighs approx. 450t including winch, HPU etc. To be able to install the 3 winch platforms, Semco Maritime installed a “Gantry system” with tracks under the topside of the Siri platform for transporting all materials and tools. The small “crane” system has been used extensively. Technical description Semco Maritime’s scope of work included: • Installation of “Gantry system“ under the topside of the Siri platform • Around 130 tonnes of scaffolding was used for the installation task and approx. 100 tonnes of scaffolding will remain in use on Siri for the removal of the winch platforms Apart from the installation of the winch platforms, Semco Maritime has assisted Subsea 7 in the installation of the “Permanent support” of Siri. The Permanent support covers 6 large clamps mounted around each leg as well as 6 steel wire ropes. Each of the clamps weighs some 145t and a single wire rope weighs approx. 55t, totalling around 1,200t. Semco Maritime has spent more than 50,000 onshore hours (white collars) and over 300,000 offshore hours (blue collars) on the project. When the project peaked in 2012/2013, almost 100 employees were involved both onshore and offshore. The project was handed over within budget and high standards. All in all to the great satisfaction of DONG, Subsea 7 and Semco Maritime. Country: Denmark Period: 2011-2014 Semco Maritime www.semcomaritime.com semco@semcomaritime.com December 2014 Dedicated to the energy sector, Semco Maritime is an international contracting and engineering company. For more than 30 years we have been facilitating design, fabrication, service and maintenance of our customers’ assets, providing comprehensive project management across all phases of energy projects. From turnkey engineering solutions to operation support and delivery of components, systems and solutions – we make sure our customers and partners in the energy sector experience safe, cost-efficient operations. Semco Maritime is an international company with 2000 employees and branches in Denmark, Norway, UK, UAE, Singapore, Vietnam, Australia, Central America and USA.
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