Stinger Section

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Stinger Section

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overview

The Stinger Section component is used to model individual sections of stinger. These individual sections may then be combined to model a complete stinger, using the Stinger component. The definition of stinger sections is appropriate for two stinger types: Hinged Rigid S-lay and Articulated S-lay. In the latter case, the stinger is part of the model and its motions will be part of the solution.

Descriptions of the Stinger Section types are provided in Stinger Section – Rigid and Stinger Section – Flexible/Flexible Hydro articles. Additional articles detail Stinger Section Data Inputs and Stinger Section Best Practice.

 

The component view for a Stinger Section is shown in the figure below.

 

Stinger Section Component View

Stinger Section Component View

 

The Stinger Section component view contains three input areas as follows:

You use the Section Type drop-down list to specify whether your stinger is Rigid, Flexible or Flexible Hydro. The significance of these terms is described in the ‘Section Type’ section of this article.

You use the Properties button to open the Properties dialog in which you specify the properties of the stinger. The dialog varies depending on whether you are defining a rigid or flexible stinger section.

You use the Supports button to open the Supports dialog in which you specify the location of the supports on the stinger. This dialog is described in the ‘Support Locations’ section of this article.

The Hydrodynamic Properties button is only enabled for the Flexible Hydro type of stinger section and it opens the Hydrodynamic Properties dialog. This dialog is described in the 'Hydrodynamic Properties' section of the Flexible Hydro article.

Section Type

The first task in defining a stinger section is to specify whether the stinger section is Rigid, Flexible or Flexible Hydro. This choice should be based on the stinger configuration in which you intend to use the section, and also on the information available to you regarding the properties of the section. The following guidelines should be helpful:

If you intend to use the stinger section in defining a Hinged Rigid S-Lay stinger, then you should select the Rigid option. In this case, the stinger itself is not part of the finite element model, and the Stinger Section component is merely used to specify the initial locations of the rollerbox supports. You may choose the Flexible or Flexible Hydro options if you wish, but any structural and hydrodynamic properties that you specify will be superfluous to requirements and so will be ignored.

If you intend to use the stinger section in defining an Articulated S-Lay stinger, then you can select Rigid, Flexible or Flexible Hydro, depending on the information available to you. If you know the relevant stinger structural and hydrodynamic properties, you should select the Flexible or Flexible Hydro options and input these properties. Otherwise, you can opt for the Rigid format, and PipeLay will automatically compute default stinger properties for you. Note that the distinction between the Flexible and Flexible Hydro options is that the latter allows you to specify complex hydrodynamic properties for the stinger section to reflect the fact that they are arbitrary in shape and do not have a simple circular cross section.

 

Support Locations

To position supports on the stinger section, you use the Supports dialog, as shown in the 'Stinger Section Supports' figure below. This dialog allows you to define support locations and the type of support provided.

Stinger Section Supports

Stinger Section Supports

 

To add a new support, you select the required Support or Tensioner component and specify its location using the Support Distance and Support Offset entries. The orientation of a support with respect to the stinger section is defined by the Support Angle entry with the default of zero being parallel to the section. The angle is measured clockwise from the stinger section. A positive value corresponds to a positive rotation around the stinger z-axis.

You may optionally offset a support away from its normal location using the Fine Tune Offset and Fine Tune Direction entries. This allows you to examine the effect of a change in support position, while still displaying the original support location. Both entries are optional. The direction of the fine tune offset is measured clockwise from the achieved support angle. A positive value corresponds to a positive rotation around the stinger z-axis. The Fine Tune Offset defaults to [CALCULATED] and the Fine Tune Direction defaults to -90° with respect to the Support Angle. A Max. Offset and Min. Offset may also be optionally specified. These two entries are only relevant if the Fine Tune Offset entry is set to [CALCULATED]. They correspond to the maximum and minimum Fine Tune Offset limits that you wish to apply to the support. The default calculation of support offsets is discussed in Technical Note 8.