Forth and Tay members

J+S Subsea

Business type: Electrical

Contact: Lucinda Craig, Business development Director
Address: Site 7, Tumulus Way,, Kintore, Aberdeen AB510TG
Email:
Countries worked in: Spain / UK

J+S Subsea provides proactive, responsive and cost-effective solutions for design, engineering, operational support and maintenance of subsea equipment, primarily related to the Subsea Production Control market.

WORKING IN THE SUBSEA ENVIRONMENT​
With years of experience working in the subsea controls sector, we understand customer drivers and priorities. Our specialist team focus on delivering competitive and timely engineering solutions.

DELIVERING COMPETITIVE, TIMELY - ENGINEERED SOLUTIONS
The culture at J+S Subsea is based on collaboration and communication with clients and it is essential for delivering competitive, timely-engineered solutions. J+S Subsea is leading the way in the Oil & Gas industry through our Legacy Locker service to optimise the value of existing, unwanted capital equipment and utilising a circular economy approach to business.

MARINE RENEWABLES
J+S Subsea is committed to adjusting economic, social and environmental behaviours to build a resourceful and sustainable future. By applying our knowledge and experience in power and signal cable applications, we can work towards this along side our clients. We have also developed a business in Marine Renewables. 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.

Subsea controls engineering specialists J+S Subsea has successfully renewed its ISO certifications in management systems in quality, environmental and occupational health & safety.Having passed a five-day renewal and migration audit by a UKAS accredited certification body, the company is now certified to ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018.

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.

Capabilities

Established supplier with significant experience supplying the sector

• Pre-Construction Development Phase (DEVEX): Front End Engineering & Design Studies
• DEVEX - Project Management & QA Services: Project Management & Programme Management
• DEVEX - Project Management & QA Services: Asset Management and Inventory Control
• CAPEX - Turbine Services: Shoreside Engineering Services
• CAPEX - Balance of Plant - Manufacture / Supply Services: Export & Array cables & components
• CAPEX - Balance of Plant - Manufacture / Supply Services: Cable Protection
• CAPEX - Balance of Plant - Manufacture / Supply Services: Electrical system including backup generator, switchgear, transformers & converters
• CAPEX - Balance of Plant - Manufacture / Supply Services: Electrical system including backup generator, switchgear, transformers & converters
• CAPEX - Balance of Plant - Manufacture / Supply Services: Offshore Equipment Services
• CAPEX - Balance of Plant - Manufacture / Supply Services: Offshore Labour Services
• OPEX - Operations & Maintenance: Onshore Electrical
• OPEX - Operations & Maintenance: Testing and Certifications
• Decommissioning: Decommissioning

Good capacity and some experience in supplying the sector

• Pre-Construction Development Phase (DEVEX): Meteorological & Metocean Sensors

Capabilities to supply, but no/limited experience in the sector

• Pre-Construction Development Phase (DEVEX): Aux Systems including power supplies & navigational aids

Other services offered

• What we have done a lot of for renewables is design concept modelling for things like the Mk V Connector and several subsea transformer layouts.

Case studies

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