Subsea Services

Subsea Expertise for Every Stage of the Asset Lifecycle

Independent subsea engineering, operational and integrity support for offshore energy infrastructure, from early field development and tieback studies through project execution, life extension and decommissioning.

Subsea Expertise Across the Asset Lifecycle

THREE60 Energy provides independent subsea engineering, operational and integrity expertise across the full lifecycle of offshore energy infrastructure.

Our capability spans field development and tiebacks, engineering and delivering projects, subsea operations, pipe and riser asset integrity, decommissioning and specialist flexible pipe integrity. From new developments to ageing infrastructure and late-life assets, we combine technical expertise with practical and proven execution experience to help customers make informed decisions, manage risk and deliver effectively.

Our teams can provide anything from an individual specialist or independent study to an embedded team or complete end-to-end projects, bringing together the right expertise, knowledge and learnings around the requirements of the asset and project.

Subsea in Numbers

40 +

Subsea-focused technical resources

9

Proprietary subsea products

19

Years of subsea experience

Supporting Subsea Infrastructure From Concept to Decommissioning

One accountable subsea partner, providing individual specialists, integrated project teams & technology from early engineering through operations and decommissioning.

Engineering & Studies

Concept selection, feasibility, FEED and detailed design across pipelines, flexible products, structures, controls and flow assurance.

Project Delivery

Project management, procurement and package management, installation engineering, offshore campaign support and commissioning.

Pipeline Operator

Operate pipelines, manage regulatory compliance, integrity, operational risks & stakeholder interfaces across the pipeline lifecycle.

Operations & IRM

Operational troubleshooting, inspection and testing, anomaly management, intervention planning, fatigue assessment and asset life-extension support.

Decommissioning

Late-life planning, cleaning and disconnection, recovery studies, permits and consents, EPCI tendering and execution support.

Speak to a Subsea Specialist

Flexible Pipe Integrity

Our specialist flexible pipe capability provides engineering, inspection, monitoring and repair expertise for flexible risers, flowlines and umbilicals throughout their lifecycle.

Explore our Flexible Pipe Integrity capabilities

Combining specialist engineering knowledge with proprietary technologies, we help customers understand asset condition, identify and manage integrity risks and make informed decisions around continued operation, intervention, repair and life extension.

How We Deliver

Engineering Informed By Execution And Operations

The quality of a subsea solution depends on understanding how it will be procured, installed, operated, inspected and eventually decommissioned.

Our team combines experience from operators, engineering and execution contractors, equipment manufacturers and offshore delivery. This balance allows us to consider practical execution and long-term integrity during the earliest stages of design - not after the concept has already been fixed.

It also enables us to challenge unnecessary complexity, identify critical interfaces early and develop solutions that reflect the condition, operating environment and remaining life of the infrastructure.

Clients can engage an individual specialist, technical authority or offshore representative, supplement an existing team, or ask us to provide the project and operational management capability required for a wider scope.

Why THREE60?

Connected Expertise Across THREE60 Energy

Subsea can be provided as a standalone service. Where a project extends beyond the subsea system, we can connect our capability with THREE60 Energy’s Subsurface, Wells, EPCC, Operations and Product Solutions teams.

This is particularly valuable for field developments and tiebacks, where reservoir, wells, subsea and host-facility decisions must be aligned; and for late-life and decommissioning programmes involving infrastructure, operations and wells.

Clients gain access to the disciplines required by the scope through one THREE60 relationship, while retaining clear technical accountability.

Speak to a Subsea Specialist

Case Studies

Subsea Expertise in Practice

Explore how our subsea specialists apply engineering expertise and offshore experience to solve complex challenges, manage risk and support reliable project delivery.

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Non-Intrusive Flexible Pipe Inspection

THREE60 Energy deployed its FlexScan inspection service across eight FPSOs offshore Brazil, using non-intrusive ultrasonic technology to assess flexible pipe annulus condition and provide critical integrity data without disrupting operations.

Inspection Led Pipeline Life Extension

THREE60 Energy engineered and managed an inspection pigging campaign for a 30 km UKCS pipeline system approaching the end of its original design life, safely achieving 95% inspection data coverage to provide a quantified basis for life-extension assessment.

Pipeline Integrity Assurance

THREE60 Energy delivers annual integrity assessments of critical rigid pipeline systems for an operator on the Norwegian Continental Shelf, applying a repeatable process across risers, flowlines and spools to support safe operation and regulatory compliance.

Integrated Subsea Decommissioning

THREE60 Energy supported a UKCS operator from initial decommissioning planning through execution readiness, developing the recovery methodology, cost estimates and supporting studies required to safely remove an FPSO from station and decommission its associated subsea infrastructure.

Discuss Your Subsea Challenges

Whether you are assessing a new tieback, managing ageing infrastructure, planning an offshore campaign, addressing a flexible-pipe integrity issue or developing a decommissioning scope, speak to our team about the right technical and delivery approach.

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