Offshore and Inshore Moorings

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Ship & Offshore assists clients in the selection, design and optimisation of offshore and inshore mooring systems for applications such as floating production, storage and offloading (FPSO) vessels, floating storage and offloading (FSO) vessels, drilling and underwater operations, offshore heavy lifts, storm moorings and marine terminals.

Typically, work scopes comprise writing mooring system Statements of Requirements, calling tenders from specialist mooring contractors, evaluating tender responses (incuding checking contractor calculations) and negotiating contract specifications.

Mooring analyses may be conducted using our AQWA software package, in either the time or frequency domains, to determine vessel excursions and mooring component loads, including transient and fishtailing effects. Our mooring system design experience includes the following:-

• permanent or disconnectable single point moorings (SPM), configurations used may include:
  - catenary anchor leg moorings (CALM);
  - single anchor leg moorings (SALM);
  - articulated loading platforms (ALP);
  - riser columns; and
  - internal/external turret systems.
• spread moorings - non-weather vaning systems for short term monohull operations, semi-submersibles, or where environmental loading is found to be strongly directional, or access and swinging room is restricted;
• drag chain mooring systems;

• inshore storm moorings - single or multiple leg catenary systems for shallow water storm or cyclone refuge mooring of supply vessels, tugs and barges;
• deep and shallow water moorings - mooring systems for water depths up to 1000 metres or as low as 10 metres, for offshore drilling or floating production, harbour moorings and inshore loading facilities; and
• marine terminals - mooring systems for vessels at harbour or coastal loading facilities, including conventional berths alongside quays or to dolphins, or spread moored at exposed loading jetties.