Floating Production Systems

Longitude has extensive experience of all types of floating production units including FPOSs, FSOs, FLNG and production barges. We have provided the full scope of marine design engineering services for a number of FPSO and FSO conversions as well as engineering support for a number of floating production units in operation from modelling of marine operations to asset integrity assessment.

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Semisubmersible / FPSO / FSO Design

Longitude’s work typically covers all aspects of Naval Architecture, Structural and Marine engineering relating to the FPSO from the bottom of the pancake to the bottom of the hull, all thee way to the seabed.

Our experience covers both new builds and conversions, including shipshape, barges and cylindrical units across all areas of the unit.

Concept, PRE-FEED and Detailed Design
New Build and Conversion
Structural design of the hull, process integration and process module structure
Mooring design and analysis (Turret, Spread, STP, CALM)
Riser Analysis
Design for both benign and harsh environments.
Motions, Seakeeping and Greenwater Assessment
Stability Assessment
Installation Design and Analysis
Anchor analysis and design of suction piles
Metocean Analysis to set the design basis
Commercial assessment of the asset from build to operation.

Structrual Asset Integrity, Life Extension and Re-deployment

Our experience of floating production units extends through the life of the units, providing operations and maintenance support, structural asset integrity assessments and where required life extension. Our engineers are able to accurately assess the effects of fatigue and corrosion on a structure and where required, design strengthening or repairs to allow the unit to continue service.

Modelling of existing structures
Strength and Fatigue Analysis based on inspected and gauged structures
Historic Metocean analysis to allow a comparison of design environment with observed environment since installation
Re-calibration of fatigue life based on actual historic environment
Interpretation of Structural Monitoring
Liaison with certifying authorities
Steel renewal plans
Mitigations for cracks or corrosion
In service repair specification and procedures

Moorings and Risers

A critical component of any floating production unit is the mooring and riser system. Over the years, Longitude has gained extensive track record with all type of mooring.

Mooring design, analysis and specification including fatigue analysis
Design of single point moorings (SBM, CALM and SALM)
Relocation of FPSO mooring and riser systems
Installation Engineering for moorings and risers
Integration of internal and external turrets
Design of chain stoppers

As well as proving mooring analysis and mooring design, Longitude can provide detailed procedures for the installtion of moorings and risers as well as the tow and hook-up of the unit.

Structural Design and Analysis

Finite element analysis of hull global strength using either full ship model with dynamic loading or three hold models
Design of topside module supports and pipe racks
Structural design and analysis of modules
Design of helideck, support structures and walkways
Design of Riser porch, offloading platform structure
Design of Mooring Chain Stoppers foundations
Foundations for QRH, life boat davits and FRC
Crane pedestal design and analysis
Crane boom rest design and analysis
Design of flare tower, including foundations
Installation winch layout and foundations design