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D: Abbreviations and Symbols [Table of Contents] Sec.2: Structural Categorisation, Material Selection and Inspection Principles

DNV-OS-C105 Structural Design of TLPS (LRFD method)

[-] Sec.1: Introduction
[-] E: Description of the Tendon System

Sec.1
E. Description of the Tendon System

Sec.1
E 100   General

Sec.1 E
101   Individual tendons are considered within this standard as being composed of three major parts:
—interface at the platform
—interface at the foundation (seafloor)
—link between platform and foundation.
—in most cases, tendons will also have intermediate connections or couplings along their length, see Figure 2.


Sec.1 E
102   Tendon components at the platform interface shall adequately perform the following main functions:
—apply, monitor and adjust (if possible) a prescribed level of tension to the tendon
—connect the tensioned tendon to the platform
—transfer side loads and absorb bending moments or rotations of the tendon relative to TLP.


Sec.1 E
103   Tendon components providing the link between the platform and the foundation consist of tendon elements (tubulars, solid rods etc.), termination at the platform interface and at the foundation interface, and intermediate connections of couplings along the length as required. The intermediate connections may take the form of mechanical couplings (threads, clamps, bolted flanges etc.), welded joints or other types of connections. Figure 2 shows a typical TLP tendon system.

raster

Fig. 2   Typical TLP tendon system


Sec.1 E
104   Tendon components at the foundation interface shall adequately perform the following main functions:
—provide the structural connection between the tendon and the foundation
—transfer side loads and absorb bending moments, or rotations of the tendon
—tolerate certain level of tendon slacking without disengaging or buckling the tendon
—allow for future change-out of tendons (if required).


Sec.1 E
105   The tendon design may incorporate specialised components, such as:
—corrosion-protection system components
—buoyancy devices
—sensors and other types of instrumentation for monitoring the performance and condition of the tendons
—auxiliary lines, umbilicals etc. for tendon service requirements and/or for functions not related to the tendons
—provisions for tendons to be used as guidance structure for running other tendons or various types of equipment
—elastomeric elements
—intermediate connectors with watertight bulkheads for tendon compartmentation (if needed).


Sec.1 E
106   Certification requirements for tendon system are specified in Appendix A.

D: Abbreviations and Symbols [Table of Contents] Sec.2: Structural Categorisation, Material Selection and Inspection Principles