GLview 3D Visualization API used as the core graphics engine for simulating complex marine operations.
Ceetron AS, MARINTEK and Systems in motion have developed a real-time simulator for complex marine operations for Norsk Hydro. The GLview 3D Visualization API is used as the core graphics engine in the simulator.
MARINTEKs analysis software performs the numerical calculations as the basis for visualization. The graphical display of the system is done in real-time, with 3D graphics and possibility for stereo display. The simulator also includes software for user interaction and logging for documentation and de-briefing.
So far, the simulator is developed to support three kinds of operation scenarios: Lifting operations, Installation of flexible risers and Pipe laying. A case for each type of scenario is described in the following:
Lifting operations
Installation of a process module on a floating production platform. The weight of the module was going to cause the platform to tilt when the load was transferred from the crane to the deck. Waves were potentially going to cause a number of impacts to beams and foundation. The simulator was used to train and prepare the crew of the platform for the operation, specifically the tilting of the platform, and to test the effect of different winching operations on impact forces and tilting.
The simulator may be utilized to find the best installation sequence among several options, identify operating boundaries for the equipment used and the training of personnel for high-precision placement in changing conditions.
Installation of flexible risers
A major challenge when changing flexible risers on floating production platforms is to avoid damage to the risers due to collisions with other risers and the mooring lines of the platform during the operation. This requires very precise maneuvering of the vessel from which the operation is performed, with constant monitoring of risers and lines. Some phases of the operation have to be performed through step-wise repositioning of both platform and vessel.
Both the high demands for precision and the uncertainty regarding how the operation best should be undertaken and monitored using a ROV illustrate the need for detailed surveys and training in a simulator. The simulator can be used to test all the critical stages of the operation, including repositioning of all vessels, platforms, and risers and mooring lines. The best positioning of ROVs for monitoring the operation can also be determined during training in the simulator.
Pipe laying
Oil and Gas pipelines are frequently installed on irregular seabed topography at large water depths and subject to strong ocean currents. Challenges are finding the optimal route for the pipe, free span analysis of the selected route, and positioning of the pipe-laying vessel.
The simulator is used to study the installation process using 3D visualization of the pipe on a digitalized seabed. The forces and tension on the pipe may be visualized on the pipe using color codes and vector arrows. The visualization module also include tools for inspection of free spans and distance measurement.