We are ready to tackle new challenges.

Dynamic positioning system. SeaDP

SeaDP is a class I software used for dynamic positioning analysis and it has been completely developed by Seaplace waiting to be approved by GL for its commercialization.

  • Real time system (client-server model) of high availability.
  • High software and hardware modularity (maintenance is simplified).
  • International suppliers of recognition (effective assistance, fast deliveries of spare parts).
  • G-code programming for 3 independent platforms (operator, control, remote units I/O).
  • Sampling frequency from <1 Hz up to 75 Hz.
  • Processing of over 200 signals.
  • Synchronizing of multiple Finite State Machines.
  • 70 monitoring windows.
  • Over 150 system messages.
  • Over 1500 subroutines.
  • Over 1000 object definitions.
  • Over 20.000 code lines.
  • Control of multiple sensors (DGPS, Gyroscopes, URS, wind gauge, depth sensors…).
  • Multiple propulsion systems (conventional, azimuth, pump jets,…)
  • Configurable thrust distribution.
  • Non linear sensors.
  • Optimum quadratic controllers.
  • Prepared for multiple controllers/supervising computers, I/O units.
  • Basic functions: visualizing and monitoring, course and position control, combined manual control.
  • Advanced functions: advanced cell management, autopilot, route control, anchoring operations, anchor laying assistance. Simulation and training modes.

Risk studies.

We specialize in HAZOPS (Hazard & Operability Studies of Piping Systems) risk studies; we elaborate safety plans and revise safety designs. Among the different studies we have undertaken we highlight those which dealt with FPSO’s now operating in the North Sea.

In-house software development.

Every project we work on is unique and we give them a personalized treatment. We develop all the necessary tools to meet project requirements.


A software development based on LabView programming for the non linear dynamic analysis of floating platform and wind generator seakeeping. It considers all ocean conditions (wind, currents and waves). Validated by model testing in basin (CEHIPAR). Applicable to classic cable anchoring with or without intermediate weight/buoy, cable with crow’s foot with or without intermediate weight/buoy and tendons. The following calculations are performed:

  • Stiffness matrix.
  • Added mass.
  • Absorption test simulation.
  • Oscillation modes.
  • Dynamic stability.
  • Analysis of regular waves (RAO’s).
  • Analysis of irregular waves (mean, maximum and minimum values and RMS of time dependant data).
  • 1st and 2nd order time series, wave frequency and high frequency.
  • Springing analysis of tendons.
  • Control of 108 input signals including movement, speed, accelerations, forces and moments. The number of signals can be modified to fit the structure’s requirements.


A software development programmed with Fortran for the design and quasi-static analysis of anchoring systems for ships and offshore units. It considers all ocean conditions. Applicable to one-section anchor lines, two-section with intermediate weight/buoy, three-section and over with or without intermediate weight/buoy. The following calculations are performed:

  • Equilibrium position to compensate stationary oceanic forces.
  • First order movements.
  • System stiffness.
  • Displacement produced by waves. Maximum stress associated to this displacement.
  • Dynamic stability.
  • Cable breaking simulations (transitory movements).


A software development programmed with Fortran, used for obtaining capacity diagrams for dynamic positioning of ships and offshore units:

  • Equilibrium between environment forces (wind, currents, waves) and thrust.
  • DP-2 calculations. Failure analysis.

Collaboration with CEHIPAR (Canal de Experiencias Hidrodinámicas de El Pardo).

We have maintained a close cooperation with CEHIPAR since 1992, the year in which the Ship Dynamics Laboratory was opened. We designed the system which controls the 60-blade wave generator and we maintain an on-site collaborating team. This has given us invaluable experience concerning model testing. The scope of our work includes:

  • Software development for the wave generator (long and short waves), spectral analysis, added mass and absorption. Math libraries in Fortran and Visual Basic. The software was programmed in 2007 with math libraries in Fortran and QNX code.
  • Software development for wave generating blade control. Math libraries in Fortran and Visual Basic. Programmed in 2007 with QNX code.
  • Software development for the instrumentation needed for testing. Visual Basic code.
  • Software development for data acquisition and post-processing. Visual Basic, LabView and QNX code.
  • Development of the autopilot control system and dynamic positioning systems. Visual Basic code.
  • Development of wind simulation control system. Visual Basic code.

Structure analysis using finite element methods (FEM).

  • Dynamic analysis for structures: operation, transport, installation and dismantling.
  • Quasi-static analysis.
  • Linear analysis.
  • Non linear analysis.
  • Buckling analysis.
  • Fatigue analysis.

Besides analysing all sorts of ships and offshore units, we also analyze power modules, satellite control antennas, offshore crane pedestals…

I+D+i projects.

Given our wide experience in offshore vessels and in seakeeping analysis, we have participated and continue participating in numerous national and international I+D+i projects, both as partners and as collaborators:

  • Ocean Lider project (Iberdrola). Activities II, III and V.
  • EOLIA project (Acciona). Conceptual design of three floating platforms for supporting offshore wind turbines.
  • Study for the installation of fixed marine wind turbines (Acciona).
  • Structural study of the transition element in fixed wind turbines installed on jacket platforms.
  • Conceptual design of a submergible unit for the installation of wind turbines (MetalShips).
  • Structural analysis of aluminium shuttle tanks for retrieving crude oil form Prestige (Repsol).
  • Technical assistance in retrieval of Prestige fuel-oil (Repsol).
  • Analysis of platform dismantling methods.
  • Analysis of environmental influence on marine operations.