Top Tensioned Risers Our TTR engineers have a thorough understanding of the interface complexities involved in top tensioned risers, and the technical expertise and project management skills to design, procure and deliver even the most complex systems. TTR’s are probably the most challenging riser systems to engineer. The challenges stem from the many interfaces that must be accommodated, firstly, from interaction between production, injection and drilling risers, in-place as well as during installation and workover operations, and secondly, the need to minimise wellbay footprint and accommodate wellbay interfaces with the tensioners, jumpers and offtake piping while providing safe access for personnel. We have unrivalled experience in the design, analysis and specification of dry tree production and surface BOP drilling riser systems for TLP, spar, semi-submersible and barge production vessels. Our project experience covers a wide range of TTR diameters, services, water depths and environments, including the North Sea, Gulf of Mexico, West Africa, and Brazil. Our experience includes procurement of TLP riser systems and the detailed design of spar riser systems for the Gulf of Mexico. The many different components in TTR’s are manufactured by a range of vendors. Successful delivery of these systems has its foundation in fit-for-purpose specification of each equipment package and clear definition of the interfaces between packages. Appropriate qualification testing of connectors and fabrication methods is then needed and stack-up integration testing to ensure successful delivery in the field. 2H have the required experience and understanding to ensure these systems are successfully designed and delivered. Key Services Feasibility studies and FEED including wellbay and seabed layout Single/dual casing riser risk assessment Detailed global analysis of strength, fatigue and clearance response Development of welding, material, corrosion and riser component specifications Component hardware specification, procurement and delivery management Component qualification and testing Riser system drawings and contractor interface management Integration management and system integration test procedures Installation procedures and offshore installation support Monitoring and integrity management Project Experience Chevron – Big Foot TLP TTR Detailed Design & Delivery Management Total – Moho Nord TLP TTR FEED, Detailed Design and Delivery Management ATP – Mirage MinDOC TTR CVA Dominion (ENI) – Devils Tower Spar TTR Detailed Analysis and Sidetrack Drilling Feasibility Assessment Maersk – Chissonga TLP Single versus Dual Casing Riser Risk Assessment Exmar Offshore – OPTI-EX Semi-Submersible TTR Tensioner Feasibility Assessment BP – Horn Mountain TTR Design Verification and Production Riser Coupling Qualification BP – Holstein TTR & Conductor Fatigue Monitoring Share this page Share on FacebookShare on LinkedinShare on Twitter Services Deepwater Production Systems Riser Concept Engineering Steel Catenary Risers Top Tensioned Risers Hybrid Risers Flexible Pipes & Risers Composite Risers Subsea Flowlines & Jumpers Subsea Umbilicals System Verification & CVA Drilling, Completion & Workover Drilling Risers Drilling Riser Management Subsea Completion & Workover Risers Subsea Wellheads & Conductors Offshore Platform Conductors Platform Well Integrity & Life Extension Well Engineering Well Plug & Abandonment Integrity, Life Extension & Monitoring Riser Integrity & Life Extension Subsea Wellhead System & Life Extension Machine Learning for Riser Engineering Riser System Digital Twin Riser Monitoring System Engineering Riser Inspection, Maintenance & Repair Subsea Incident Engineering Fracture Mechanics and ECA Minimum Facility Platforms Conductor Supported Wellhead Platforms & CoSMOS Monopile Wellhead Platforms Exploration to Early Production Systems Structural Engineering Services Installation Engineering Decommissioning Engineering Riser Delivery Management Component Detailed Design Mechanical Connectors Systems & Qualification Testing Offshore Renewables & Alternative Resources Fixed Offshore Wind Floating Offshore Wind Deep Sea Mining Related TECHNICAL PAPER Application of Casing Wear Theory to Top Tensioned Risers See all Technical Papers TECHNICAL PAPER Interference Assessment between Top Tensioned Risers Using a Comprehensive Screening Approach See all Technical Papers TECHNICAL PAPER Top Tensioned Riser (TTR) Engineering Integrator Supply Model See all Technical Papers