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 and manufacture of 8 Riser Release Clamps (2 × 5”, 4 × 8”, 1 × 10”, 1 × 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
Posted in
Repair & Maintenance