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GEOG Maria Hold Back Anchor

29-06-2016
GEOG Maria Hold Back Anchor
 

Sea and Land Project Consultants Limited has successfully completed the structural design of the tether block required to restrain the water injection (WI) riser for the Statoil Marian oil development, where it takes injection water from the nearby Heidrun platform. The WI riser is to be a 10.3” flexible pipe in a free hanging catenary configuration. To ensure stability at the seabed location the riser requires an axial restraint which is to be provided by a friction clamp tethered to the anchor block on the seabed.


            

           
Caisson arrangement with radial beams, tether post, locating pins and 125 tons GN
         forged rope shackle.  Top mounted standoff anodes visible on radial beam flanges


The anchor block was designed and successfully installed on the seabed on Monday 20th June 2016.  The anchor block is an 8m diameter circular caisson, designed to penetrate 3m into the seabed, and is constructed primarily from steel with additional cast in-place concrete kentledge.  It has a lift weight in air of 180 tonne.  It is to be installed by a DSV mounted crane into approximately 340m water. 


               

               
Caisson awaiting onshore lift to quayside
                          ready for lift onto barge



Detailed design included temporary construction conditions, in-place and fatigue, in-air lift, in-water set-down analysis and the assessment of geotechnical stability considering a VHM yield surface approach for ULS condition in normally consolidated marine clay. 

                                    
                                       

                                                     
       Painted caisson on quayside awaiting load-out onto barge




 

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