Cofferdams for Spudcan Repairs

Cofferdams for Spudcan Repairs

Challenge

SeaTec was tasked to create a dry working environment around the giant support feet (spudcans) of a jack up oil rig. The cofferdams system had to completely enclose each spudcan in turn and seal against the underside of the rigs hull. When in position the area around and above the spudcan would be drained, thus allowing surface workers to carry out required Class approved weld repairs.

Work was carried out in the port of Esbjerg, Denmark with only 10m of water available, and water visibility of less than 30cm.

Solution

SeaTec designed, manufactured and installed a unique cofferdam system that allowed afloat repair of all three spudcans of a jack up oil rig.

The design of the cofferdam consisted of a bolted hexagonal steel ring with intergrated ballast tanks and a flexible membrane that covered the underside of the spudcan, sealing around the steel ring. The benefits of this design over an all steel construction were reduced weight, manufacturing costs and clearance required for installation.

In addition to the main cofferdam system a series of inflatable seals were placed inside the steel ring and outside the spudcan; this further reduced the risk of leakage by providing a secondary sealing system.

The complete cofferdam system measured 16m across, 2m deep and weighed 35 tonnes.

Share This

Talk to one of our team

    I require a quoteI have a general enquiry


    What service do you require a quote for?

    Projects & New Builds
    Conversion & RefitEngineering & ConsultancyNew Building

    Please select an option from the menu
    BWTSScrubberRe-engineOther

    Navigation & Communication
    BridgeConnectivity

    Subsea
    Survey & InspectionHull Cleaning & Propeller PolishingSubsea Engineering & RepairsBlanks & CofferdamsMarine ConstructionSpecialist ServicesEquipment Sales

    Please select an option from the menu
    Mini Pamper Hull Cleaning VehicleTwin Brush Cleaning ToolSingle Brush Cleaning and Polishing ToolBrushes and padsHydraulic UmbilicalsWD80 Hydraulic Power Pack System

    Condition Monitoring
    LO analysisFO analysisBWTS water analysisScrubber analysisPortable water analysisVibration surveyOther

    Other
    Other

    Please email me backPlease call me back

    Social Media

    Call or Email Us

  • Glasgow +44 141 305 1300
  • Southampton +44 23 8026 9866
  • Rotterdam +31 10 438 6644
  • Copenhagen +45 35 14 30 00
  • Monaco +377 92 05 10 10
  • Shanghai +86 21 2026 7012
  • Chennai +91 44 4647 9922
  • Singapore - Keppel Towers +65 626 11340
  • Singapore - Benoi Place +65 6351 8720