Subsea Equipment Refurbishment & Recertification

Extending asset life, improving reliability and reducing replacement costs for critical subsea equipment.

J+S provides specialist refurbishment, recertification and upgrade services for subsea control systems, power distribution equipment, connectors, transformers and associated offshore infrastructure. Our engineering-led approach helps operators maximise value from existing assets while maintaining performance, reliability and operational readiness.

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J+S Subsea hydraulic control panel used for subsea control system testing, diagnostics and operational support.

Extending the Life of Critical Subsea Assets

Replacing subsea equipment can be costly, time-consuming and operationally disruptive.

J+S helps operators extend the service life of critical subsea infrastructure through refurbishment, recertification and targeted upgrades that restore performance while reducing capital expenditure and project risk.

Our engineers assess equipment condition, identify improvement opportunities and develop practical refurbishment strategies that maximise asset value and operational reliability.

Our Refurbishment & Recertification Capabilities

Subsea Control Modules

Inspection, repair, refurbishment, testing and recertification of subsea control modules and associated equipment.

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6 J+S Case Study Collaborative Power Delivery System 1

Distribution & Power Systems

Refurbishment of subsea distribution units, transformers and power distribution infrastructure.

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Connectivity Systems

Repair, refurbishment and recertification of electrical, hydraulic and fibre optic connection systems.

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Hydraulic Equipment

Maintenance, refurbishment and testing of hydraulic control and distribution equipment.

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4 J+S Case Study Bleo Holm Electrical Splicing 1

Electrical Systems

Electrical inspection, repair, testing and certification of subsea electrical infrastructure.

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Legacy Equipment Support

Refurbishment and upgrade strategies for ageing and obsolete subsea assets.

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Benefits of Refurbishment & Recertification

  • Reduce Capital Expenditure

Avoid unnecessary replacement costs by extending the life of existing assets.

  • Improve Reliability

Restore equipment performance through targeted refurbishment and testing.

  • Reduce Lead Times

Refurbishment can often be completed significantly faster than sourcing replacement equipment.

  • Address Obsolescence

Upgrade critical components and overcome legacy equipment challenges.

  • Support Sustainability Goals

Reduce waste and maximise value from existing subsea infrastructure.

Equipment We Support

Control Systems

  • Subsea Control Modules (SCMs)
  • Control Manifolds
  • Communications Equipment
  • Monitoring Systems

Power Distribution Equipment

  • Electrical Distribution Units
  • Hydraulic Distribution Units
  • Chemical Distribution Units
  • Subsea Transformers

Connectivity Equipment

  • Electrical Connectors
  • Hydraulic Couplers
  • Umbilical Termination Assemblies
  • Cable Assemblies
  • Fibre Optic Systems

Ancillary Equipment

  • Pressure Housings
  • Deployment Equipment
  • Interface Equipment
  • Test Equipment

Our Refurbishment Process

  • 1. Inspection & Assessment

Detailed evaluation of equipment condition and operational suitability.

  • 2. Engineering Review

Identification of repair, upgrade and obsolescence management requirements.

  • 3. Refurbishment

Repair, replacement and refurbishment activities undertaken by experienced engineers and technicians.

  • 4. Testing & Verification

Electrical, hydraulic, mechanical and functional testing to verify performance.

  • 5. Recertification

Documentation and certification supporting return to service.

Our Refurbishment Process

  • 1. Inspection & Assessment

Detailed evaluation of equipment condition and operational suitability.

  • 2. Engineering Review

Identification of repair, upgrade and obsolescence management requirements.

  • 3. Refurbishment

Repair, replacement and refurbishment activities undertaken by experienced engineers and technicians.

  • 4. Testing & Verification

Electrical, hydraulic, mechanical and functional testing to verify performance.

  • 5. Recertification

Documentation and certification supporting return to service.

Legacy Locker™

Refurbishment is a key component of J+S’s approach to asset recovery and equipment reuse.

Through Legacy Locker™, we help operators identify opportunities to recover, refurbish and redeploy valuable subsea equipment that might otherwise be scrapped.

This approach supports cost reduction, sustainability objectives and improved equipment availability across the industry.

Explore Legacy Locker™

Featured Refurbishment Projects

Real-world examples of how J+S refurbishment capabilities deliver results for our clients.

Legacy Locker Refurbishment Programme

Supporting equipment recovery, refurbishment and reuse across offshore assets.

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UTA and SDU System Upgrade

Refurbishment and upgrade of subsea distribution equipment to improve reliability and performance.

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SCMTS & DSCM

Inspection, testing and refurbishment of critical subsea control infrastructure.

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Why Choose J+S?

Engineering-Led Approach

Multi-Disciplinary Expertise

In-House Testing Facilities

Lifecycle Asset Support

Independent Solutions

Looking to Extend the Life of Your Subsea Equipment?

Whether you need refurbishment, recertification, equipment upgrades or asset assessments, our engineering team can help.

Discuss Your Equipment
Contact Our team
Mark Patterson Non-Executive Chair

Mark Patterson

Non-Executive Chair

Mark’s career spans five decades, marked by entrepreneurial success and visionary leadership across various sectors, including offshore marine technology, subsea oil and gas, green energy storage, and more.

With a track record of leading businesses through start-up, growth, acquisitions, and transformations, Mark’s expertise lies in strategic decision-making, mentoring, and brand management.

He has overseen multimillion-pound projects, pioneered new technologies, and guided companies to international recognition, such as the underwater GPS NASNet®.

His leadership style is direct, inclusive, and based on trust, empowering teams to excel.

Mark’s achievements include managing high-profile global companies, such as Balmoral group, Nautronix and Well-Safe Solutions, where he played key roles in groundbreaking projects. Global explanation and high growth.

Outside of business, Mark is deeply committed to family and charity work, with a passion for shooting, boating, and car collecting. As an experienced executive, he remains dedicated to fostering success by identifying future opportunities and mentoring the next generation of leaders.

Mark Patterson Non-Executive Chair

Mark Patterson

Non-Executive Chair

Mark’s career spans five decades, marked by entrepreneurial success and visionary leadership across various sectors, including offshore marine technology, subsea oil and gas, green energy storage, and more.

With a track record of leading businesses through start-up, growth, acquisitions, and transformations, Mark’s expertise lies in strategic decision-making, mentoring, and brand management.

He has overseen multimillion-pound projects, pioneered new technologies, and guided companies to international recognition, such as the underwater GPS NASNet®.

His leadership style is direct, inclusive, and based on trust, empowering teams to excel.

Mark’s achievements include managing high-profile global companies, such as Balmoral group, Nautronix and Well-Safe Solutions, where he played key roles in groundbreaking projects. Global explanation and high growth.

Outside of business, Mark is deeply committed to family and charity work, with a passion for shooting, boating, and car collecting. As an experienced executive, he remains dedicated to fostering success by identifying future opportunities and mentoring the next generation of leaders.

Phil Reid Managing Director J+S-Subsea

Phil Reid

Managing Director

Phil has worked in the energy industry for over 25 years. He started his career with Kvaerner FSSL progressing through a variety of roles in subsea engineering, from manufacturing to leading some of their most complex projects all over the world. He worked with the original J+S for a period before moving on to Genesis Oil and Gas as a Subsea Controls Engineering consultant; during that period, he was seconded to Centrica Energy (now Spirit Energy) which led to a permanent role as Lead Subsea Controls & Umbilical Engineer for Developments, Capital Projects and Operated Assets. For almost a decade Phil successfully delivered Capital Projects from concept right through to project close out whilst also looking after the running of their subsea assets.

As part of J&S Subsea limited, Phil oversees the day-to-day operations and will grow the business both in the UK and globally. 

James Morris

Engineering Director

James’s career started when he joined the Royal Navy from school as an Artificer Apprentice. After a 5-year Marine Engineering Apprenticeship he served in surface ships HMS Glamorgan, HMS Edinburgh, and HMS Glasgow and at Rosyth as part of an engineering support team. 

Moving into the Energy Industry in 1992, over the next 26 years he gained a wealth of experience within large and small companies on operation, design and project management of subsea control systems and equipment. This period started with several years as a Project Engineer for a family run hydraulic services company Grampian Hydraulics followed by 5 years as a Support Engineer at Kvaerner Oilfield Products.  James joined RRC Controls Services ltd in 2001 before finally moving to J+S Ltd in 2010. At J+S his dedication and technical capabilities were rewarded with several promotions until becoming a member of the management buyout team. 

He has designed an extensive array of subsea equipment from basic cable penetrators to complete subsea control modules. 

James thrives on providing solutions for client’s problems. 

As Engineering Director, James will ensure that the company provides clients with timely, cost effective and technically sound solutions and services. 

Matthew Blair

Executive Chairman

Matt Blair is Executive Chairman of J+S Subsea which was formed in October 2020 through a management buyout of the Subsea Engineering Division of Systems Engineering and Assessment Ltd.

With J+S Subsea and SEA for over 14 years, Matt has a wealth of industry knowledge and expertise.

Previously an Electronics Engineer with Ferranti Computer Systems Ltd specializing in sonar and submarine command systems, Matt moved into hydrographic survey working with Subsea7, Tritech, and CDL before joining J+S Subsea.

He was Vice Chair of the Decom Leadership Group of Decommission and in that role, he facilitated industry and academic studies on potential for reuse and repurposing of decommissioned equipment. He is still actively involved with the reuse agenda through Decommission and OEUK.

Although not part of day-to-day operations, Matt stays close to company strategic matters and is seeking further opportunities to update and transfer Energy technologies and products into the Marine Renewables markets and help to develop the broader circular economy.

Contact Us

  • J&S Subsea Limited
  • The Lombard Centre
  • Kirkhill Place
  • Dyce
  • AB21 0GU
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