Stinger

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Stinger

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Overview

The Stinger Component is used to define a range of stinger configurations available in PipeLay.

 

stinger_component

 

Stinger configurations can be of three types – Rigid S-Lay stingers, Articulated S-Lay stingers and J-Lay towers. Rigid S-Lay stingers are further classified as being Explicitly Defined, Radius of Curvature Defined or Hinged. The Rigid S-Lay stinger and the J-Lay tower are fundamentally different to the Articulated S-Lay stinger in the following respect. The motions of the first two are completely defined by the motions of the vessel to which they are attached. In fact for these structures the stinger itself is not part of the model; only the supports on the stinger are explicitly modelled. An articulated stinger on the other hand is one that is explicitly included in the finite element model, and the motions of the stinger and any supports on the stinger are not imposed, but are in fact solved for based on the forces on the stinger, including the loading from the pipeline itself. The stinger coordinate system is outlined below while the descriptions of the various stinger modelling options are divided into the following sub articles:

Rigid S-Lay Stinger’ describes the various options for creating a Rigid S-Lay stinger. Separate sub-sections describe the specific inputs required for the Explicitly Defined, Radius of Curvature Defined and Hinged modelling options.

Articulated S-Lay Stinger’ describes how a stinger of this type is assembled from Stinger Section and Flex Joint components.

J-Lay Tower’ describes the various inputs associated with a J-Lay configuration.

Additional articles provide information on the Stinger Data Inputs and Stinger Best Practice.

 

Stinger Co-ordinate System

All of the co-ordinates that you enter on a Stinger component are specified relative to a stinger origin. This can generally be any point that you choose on or in close proximity to the stinger in reality. Exceptions to this are the hinged rigid S-Lay stingers, where the stinger origin represents the start of the first stinger section, and J-Lay towers, where it represents the tower hinge point. This point can be considered to be the origin of a local axis system for the stinger. The location of the stinger origin is itself specified on the Vessel component, with respect to the vessel origin. The figure below illustrates the stinger co-ordinate system relative to the vessel co-ordinate system.

Stinger Co-ordinate System

Stinger Co-ordinate System