Marine Renewables

At J+S, we recognise that the Offshore Industry brings challenges in getting power and control information from energy conversion devices to shore.

J+S Subsea Drymate Connector

The J+S dry-mate connector allows high voltage power to be transferred from tidal and wave generation systems through various sized composite cables comprising power cores, system control (fibre optic cores) and cable communication cores.

The J+S solution provides a pressure balanced make and break connection allowing generators and cables to be safely deployed and connected. The termination was designed to be virtually Partial Discharge (PD) free, required for test and development installations. It can be configured as a pass-through connection or testable stop-end. In the latter mode it allows full monitoring, energisation and testing of the terminated cable from the shore.

Terminated cables are then converted to a splice or in line connection to connect to a generator.

The connection can at any time be returned to a stop-end termination without the need to replace the assembly therefore minimising costs.

Key Features

  • Attached to a composite cable and left as a stop-end allowing cable integrity to be tested.
  • Converted to a splice/connector by populating the second half of the frame.
  • Deploy / recover in seas with high current flow due to the free flooding design of the frame and integral lift points with bend stiffeners to limit the stress induced through the cables.
  • Utilise for up to 25 years due to built-in cathodic protection and subsea coating.
  • Can be modified to meet individual customer requirements.

System Description

  • Two-part subsea coated and cathodically protected frame assembly.
  • Facility to terminate power cores – up to 36kV.
  • Facility to terminate control – protection cores.
  • Facility to terminate multiple fibre optics with loop-back for shore testing..
  • Designed for safe and secure deployment and recovery.
  • The J+S system is available in various configurations to meet different cable size / configuration requirements including branch termination..
  • The design is fully scalable for the ever-changing requirements in the Marine Renewables environment.

J+S Fastmate Connector

The latest Mark V version of the J+S fastmate connector is designed to reduce pre-assembly and offshore installation time to an absolute minimum.

Mark V Receptacle Connector

The receptacle connector assembly is a cylindrical assembly directly mounted onto the end of the umbilical. The connector is designed to interface directly to the Mark V Plug connector.

The following elements are incorporated into the design; 

  • Glanded housings for receptacle half of connector for each power core connection.
  • Fully water-blocked armour termination assembly mounted directly to rear of the connector frame and with interface for either Vertebrate Bend Restrictor or bend reducer.
  • Fibre Optic junction box and patch cable.
  • Low Voltage control circuit direct or manual connection interfaces.
  • Lifting and handling.
  • Coating and Cathodic protection.
  • Alignment & Guide Pin Receivers.
  • Through connection of earth and screening braids.

Mark V Plug Connector

The plug connector assembly is a cylindrical assembly directly mounted onto the end of the umbilical. The plug connector is designed to interface directly to a receptacle connector or into a distribution or transformer hub with receptacle connector interfaces.

  • Glanded housings for receptacle half of connector for each power core connection.
  • Flexible mounting arrangement for connector alignment and clearance allowance.
  • Fully water-blocked armour termination assembly mounted directly to rear of connector frame and with interface for either Vertebrate Bend Restrictor or bend reducer.
  • Wet storage protective cover.
  • Fibre Optic junction box and patch cable.
  • Low Voltage control circuit direct or manual connection interfaces.
  • Lifting and handling.
  • Coating and Cathodic protection.
  • Alignment & Guide Pins.
  • Through connection of earth and screening braids.

Mark V Connector Hub

The J+S connector hub interfaces with Mark V connections to accept a standardised connector fitted to import and export umbilical cables. Connections would be dry-mate connections made on the deck of a suitable support vessel.

Subsea Connector Hub - 3 Way

The J+S connector hub interfaces with Mark V connections to accept a standardised connector fitted to import and export umbilical cables. Connections would be dry-mate connections made on the deck of a suitable support vessel.

Key Features

  • Receptacle connector interfaces as per Mark V receptacle connector above arranged on a front face of a connector hub assembly.
  • 3-phase power distribution housing.
  • Glanded cable assemblies between power distribution housing and receptacle connector interfaces.
  • Wet storage protective covers for each power core connection.
  • Fibre Optic junction box and patch cable.
  • Low Voltage control circuit direct or manual connection interfaces.
  • Lifting and handling.
  • Coating and Cathodic protection.
  • Alignment and guide pin receivers.
  • Through connection of earth and screening braids.

Subsea Connector Hub - 5 Way

The 5-way connector hub assembly will be a standalone assembly similar to the 3-way hub but with 5 Mark V receptacle interfaces mounted on one end. The female interfaces are designed to interface directly to Mark V plug connectors for connection to 4 of generator inputs and output service connection.

The connector hub could also be daisy chained with up to 3 generator inputs connected into a ring main.

High Voltage Terminations

J+S have experience and capability to provide support for High Voltage connector termination and splice repair work both on and offshore. We have our own offshore rated habitat that can provide a safe and sheltered working environment on the back deck of a vessel.

Rugged and Flexible Solutions

Our Marine Renewables Systems offer clients proven, rugged and flexible solutions for onshore and offshore implementation. Our proven track record and expertise have also allowed us to begin working on the next generation of connectors to reduce installation and connection times for the operator.

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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
  • info@jands.co.uk
  • +44 1224 773435
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