This article describes the operation of the Vessel component, and outlines the relevant inputs.
The Vessel component is used to collate information characterising a vessel and the associated motions of the vessel. The Vessel component is also used to associate a stinger with the vessel by referencing a Stinger component. Supports may also be positioned on the vessel deck by referencing Support and Tensioner components directly. The support positions can be fine-tuned by PipeLay in order to achieve specific pipe radii of curvature. Vessel motions are governed by the association of a Vessel Motion component with the vessel. A vessel profile may be optionally associated with the vessel for illustrative purposes. This appears in all animation files generated by analyses that include the vessel. The Vessel component is referenced by the Model component, where it may be combined with other components to build a complete pipeline installation model.
An important parameter for each vessel is the location of the vessel origin. This location represents the origin of a local vessel axis system. All other locations specified on the Vessel component are with respect to these local axes. You only specify the location of the vessel origin from within the Model component when you add a vessel to a model. This allows the specification of vessel data to be independent of any particular model; it is only on the Model component itself that a particular vessel is ‘fixed’ or located with respect to that model.
You can also define a vessel reference point for a vessel, which is different to the vessel origin. The vessel reference point is the point on the vessel for which vessel RAOs and motions are defined. By default, the vessel reference point is the same as the vessel origin.
The inputs are divided into five main categories, as follows:
•'Profile Options' describes how you would define a physical profile for the vessel.
•'Reference Point' describes how you define the location of the vessel reference point relative to the vessel origin. The vessel reference point is the point on the vessel for which vessel motions are calculated, using for example, vessel RAOs. The vessel reference point is optional. By default, the vessel reference point and the vessel origin are coincident.
•'Supports' describes how you position supports on the vessel deck via reference to Support and Tensioner components. It also describes how to instruct PipeLay to fine tune the Support components’ elevations to achieve specific pipe radii of curvature.