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  ["title"]=>
  string(47) "Replacement of riser buoyancy modules completed"
  ["alias"]=>
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  ["introtext"]=>
  string(2909) "

SubC recently successfully replaced selected buoyancy modules on the live riser via ROV on Maersk Oil GP3 FPSO. 

SubC Partner recently completed an EPCI project on the Maersk Oil GP3 FPSO in the Dumbarton field in the North Sea, 230 kilometres northeast of Aberdeen. successfully replaced selected buoyancy modules on the live riser via ROV while avoiding a costly shut down of oil production.

The EPCI project was awarded by Maersk Oil UK in March 2015. The brief was to replace selected buoyancy modules on a live riser without shutting down oil production. The existing buoyancy modules on the riser had slipped and were no longer maintaining the riser position and shape in the water, which were now outside design specifications.

Traditionally, such an operation to replace buoyancy modules would require disconnection of the riser and a complete halt to oil processing during the work – making it a very costly operation. This project, the first of its kind, developed an ROV solution to perform operations from outside the swing circle of the FPSO and eliminated the need for the FPSO to stop production.

Our organisation took up the challenge and in only five months had developed the concept, carried out detailed design work and manufactured the Subsea Flexible Riser Repair-Solution. Extensive factory acceptance tests followed the manufacturing and comprehensive wet tests were performed in Esbjerg.

We mobilised a work class ROV at its facilities and rented an area of the harbour in Esbjerg to simulate the entire offshore operation. This comprehensive harbour simulation allowed all the developed tools to be tested in real life conditions. Any risks were identified and eliminated and operators had the opportunity to familiarise themselves and train with the state-of-the-art engineering tools.

In September, following completion of the wet tests, the vessel Polar King was mobilised and works started immediately after at the Dumbarton field. Approximately 55 people in total were deployed offshore for the operation, including project and crew personnel on a 24/7 setup.

Selected buoyancy modules were successfully removed and subsequently replaced, completely reinstating the effectiveness of the original setup. The teams offshore from MOUK, SubC Partner, DOF and GC Rieber worked together very closely and completed the project in about 3 weeks without any incident, accident or LTI.

See how it works on www.youtube.com/watch?v=9OFOk7kdI2g

  

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Replacement of riser buoyancy modules completed

SubC recently successfully replaced selected buoyancy modules on the live riser via ROV on Maersk Oil GP3 FPSO.  SubC Partner recently completed an EPCI project on the Maersk Oil GP3 ...

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object(stdClass)#729 (58) {
  ["id"]=>
  string(2) "88"
  ["title"]=>
  string(43) "Dantysk OWF – seabed survey and levelling"
  ["alias"]=>
  string(39) "dantysk-owf-seabed-survey-and-levelling"
  ["introtext"]=>
  string(2226) "

SubC performed seabed survey and levelling in preparation for the DanTysk Offshore Accommodation Platform (OAP) jacket structure.

The operator of the Dantysk Offshore Windfarm, Vattenfall, approached SubC Partner with an urgent request to survey and level the seabed in preparation for the DanTysk Offshore Accommodation Platform (OAP) jacket structure.

The purpose of the work was to ensure that the seabed was at a certain depth and flat at the footprint of the OAP jacket structure. The requirement for the flatness was less than delta 10 cm with an edge slope of 1:6.

We was asked to provide a swift package solution for immediate offshore operation. The solution was based on using a DP2 vessel equipped with a suitable active heave compensated crane to operate the bespoke hydraulic dredging grab. The survey solution consisted of a state of the art multi beam/sonar with a ultrahigh 128 x 128 beam resolution. The survey equipment could provide continuous monitoring and 3D real-time measuring of the actual seabed depth.

A total of approximately 200 m3 of soil was dredged to a high degree of accuracy.

The mobilisation was performed very fast quickly, especially considering the bespoke dredging and complex multi beam survey system. The operation itself required few offshore operation days - including in-survey and out-survey reporting.

The completion of the project and finalisation of the offshore works demonstrated a high level off efficiency and quality while maintaining strict safety awareness. The proactive and soundly based culture of solution breakdown and knowledge sharing was evident throughout the entire operation and characterised the excellent, continued cooperation between customer and SubC.

Read and Download our Track Record here

  

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Dantysk OWF – seabed survey and levelling

SubC performed seabed survey and levelling in preparation for the DanTysk Offshore Accommodation Platform (OAP) jacket structure. The operator of the Dantysk Offshore Windfarm, ...

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