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Moorings, Cables and Umbilicals 

Service Introduction

Robust, efficient and cost-effective subsea infrastructure, such as moorings, subsea power cables and umbilicals, is critical to offshore construction operations and future energy production. Exposed to the hostile elements of subsea conditions, increasingly congested marine spaces and unique environmental conditions of new geographies, these subsea assets require careful and comprehensive engineering at their original installation to support their long-term performance.

Longitude is a market-leading provider of marine operations design and engineering services to support all types of moorings, subsea cables and umbilicals.

Our global and cross-sector experience, built up since 2006, places us uniquely to understand the diverse risk profile that may impact the durability and effectiveness of these assets. We also employ our extensive knowledge in different vessel types and operations to help clients in making design decisions for the long-term, driving value to your bottom line.

Moorings, Cables & Umbilicals Challenges

  • High installation and maintenance costs: 

    Detailed and advanced risk mitigation at installation can reduce the risk of future maintenance requirements.
  • Resilience against harsh environmental conditions:

    With an increasing risk profile as projects go further offshore and into new geographies.
  • Supply chain bottlenecks and logistical challenges:

    Causing delays in installation and impacting CAPEX and OPEX.
  • Technological advancements 

    And new risks that these entail if not properly tested and inspected.
  • Congested navigation and busier marine spaces:

    Raising the risk profile to subsea assets, if not properly analysed, identified, and mitigated against.

Our Services: Subsea Cables & Umbilicals 

Longitude provides the services that our customers require to fulfil their mission of designing cable routes and understanding risk to subsea installation, vessel mobilisation, cables’ protection, maintenance and repairs for offshore wind projects and subsea interconnectors.

Our operationally-focused submarine cable installation services include skidding moorings, cable lay and pull, analysed in simulations using Orcaflex – the industry-standard software applied to these operations.

Longitude has also developed its own tool for automating the pre- and post-processing of cable installation analyses, allowing us to handle an increasing number of environmental cases.

Services include: 

  • Site Characterisation and ground modelling
  • Survey Specification and Management
  • Geospatial data management and analysis
  • Cable Routing Assessment and production of route positioning lists
  • Cable Burial Risk Assessment (CBRA)
  • Cable Burial Assessment Study (BAS)
  • Infrastructure crossing design (concept and detail design)
  • Cable protection design (concept and detail design)
  • Freespan Analysis
  • Nozzle Configuration
  • Pump Analysis
  • Burial Tool Development support
  • Scour assessment
  • Seismic engineering and liquefaction analysis
  • On bottom Stability Analyses

We are also experienced in providing ongoing support for the continued cable protection post lay analysis and the review of protection measures and cable-soil studies.

Our Services: Moorings 

Longitude is experienced in providing advanced mooring analyses and designing a wide range mooring systems. Our expertise has supported both temporary and permanent mooring systems, at offshore locations and alongside quays, vessels and other facilities.

Our services include:

  • Detailed mooring installation procedures
  • Mooring design and analysis
  • Static and dynamic simulations (MOSES, Optimoor, Orcaflex mooring analysis engineering)

Our Value

Multi-disciplined design and engineering expertise combined with +40 years of practical experience in moorings and subsea cables installation and operations from the wider ABL Group

Global footprint and experience mean we have an in-depth understanding of different geographies and unique environmental conditions

Experience across all mooring types and all vessel types

Extensive track record in subsea power cables and interconnector projects from around the world

Your Projects

View All Case Studies

Explore examples of how Longitude’s services in Moorings, Cables and Umbilicals, have contributed to the successful delivery of your projects.

Through-life support in subsea cables from ABL Group 

ABL Group companies – ABL and OWC, alongside Longitude – combine to offer the deepest pool of multi-disciplined engineering and marine expertise to support the safety and performance of subsea cables, umbilicals and interconnector assets through life. Together we provide services that support these critical power assets from feasibility and planning, to engineering, installation and operations.

Get in touch

If you’d like to know more about how we can help you, simply fill out the form below. Our team will get back to you as soon as possible.

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