Mooring analysis

James Fisher Marine Services offers a world leading mooring analysis service, developed over a series of innovative and technologically advanced wave, wind and tidal projects.

Through a number of recent projects, and in line with a growing need to understand the loading effects of moored marine renewable energy converters, James Fisher Marine Services (JFMS) has successfully developed a series of strong mooring design and analysis capabilities.

James Fisher Marine Services' mooring analysis techniques include:

  • Mooring design and component specification
  • Moored load analysis
  • Unmoored stability and towing analysis
  • Operational and survival case analysis

Example mooring analysis projects undertaken by JFMS, formerly Mojo Maritime.

Floating lidar mooring design and installation

During this project, we designed, procured and installed a bespoke mooring solution for a low motion floating lidar platform. Being a deep-draft structure, the platform could not be towed in its upright position, thus requiring a complex tow and offshore transfer analysis. JFMS successfully installed the platform at an offshore wind farm site in 2013.

Floating wave energy converter

This project included the design, analysis and installation methodology for a mooring spread used to anchor an innovative wave energy converter. It required significant analysis to determine the device loads and find an optimal mooring configuration to ensure the device would not pick up the mooring. A highly advanced coupled CFD-hydrodynamic model was required owing to the inseparability of platform response, power take off and mooring reaction. With regards to installation, the rocky seabed and presence of electrical infrastructure meant the installation methodology required significant precision.

Barge analyses

JFMS has performed multiple concept and design studies looking at performing drilling operations from moored barges. This included modelling and analysing different barges and loading scenarios for which we developed mooring designs. This included designs requiring the equipment used from the barge to remain within 5 degrees of verticality whilst carrying out operations.

Vessel mooring design

JFMS designed a deep water (>1200m) mooring spread and installation methodology, intended to facilitate mooring of large anchor handlers. The main challenges in this project related both to the mooring loads, and the significant depth of deployment.