STATS GROUP
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SUBSEA SERVICES
> Riser Securing Clamps
     
  Background / Challenge
  • North Sea Floating vessel had been decommissioned.
  • Requirement to release multiple flexible risers from the platform for abandonment.
  • Serviceability of Remote Release Connectors (RRC) between platform and risers unknown.
  • Restricted vertical access to riser heads.
  • Design a clamp that could support the weight of the riser should the RRC fail to release.
  • Provide a means of riser attachment for a controlled decent to the seabed.
  • Engineer a means of deploying the clamps with diver assistance, around various sized risers, set at 11° angle to the vertical.
  • Allow for restricted vertical access.
     
    Solution
  • Design & manufacture of 8 Riser Release Clamps (2 x 5”, 4 x 8”, 1 x 10”, 1 x 12”).
  • Clamps hinge around riser and provide a hold open device aiding clamp deployment.
  • Counterbalance arms precision engineered to maintain 11° angle to riser.
  • Lifting points positioned on counterbalance arms aid deployment around RRC casing above riser head.
  • Each clamp capable of withstanding the weight of their respective riser during release and lowering phases.