TLP
courtesy: Anadarko Petroleum Company
General information
A Tension Leg Platform (TLP) is a floating platform which is connected to the seabed by vertical tendons or tethers. The tendons are kept under tension by the buoyancy of the platform and this pre-tension is designed to keep the tendons under tension under all circumstances, even in large waves with high crests and deep troughs. The stiff connection of the platform with the seabed reduces the vertical motions to a minimum and gives it a short natural period, outside the wave frequency region (2-4s). This allows the use of dry trees.

Services & Activities
The Offshore Department has performed a lot of tests on TLPs in recent years. With its deep pit of 30 metres, the OffshoreBasin offers the possibility of testing TLPs with their full tendon length, even in ultra deep waters. This allows reliable testing, including important effects such as setdown and the related airgap in large waves.

The Trials & Monitoring Department has initiated a Joint Industry Project to measure and assess the environmental and structural loads on the Marco Polo TLP (operated by Anadarko), located in the Gulf of Mexico in 4,300 ft of water. With hurricane Ivan in 2004 and hurricanes Katrina and Rita in 2005, the Gulf of Mexico has suffered significant damage to its offshore structures. The Marco Polo JIP provides high quality environmental and structural data to all stakeholders and their technical experts.

Facilities & Tools
TLPs are tested in the following MARIN facilities :


The behaviour of TLPs is simulated with the following tools : (DIFFRAC, DRIFP and DYNFORC for MARIN internal use only)

Software Sales
Some software tools are available for commercial use outside MARIN. A complete overview of these software tools for sale can be found under Software Sales.

Experience record
The list below gives a review of TLP model tests carried out at MARIN :

  • Okume TLP (Hess, 2006)
  • Shenzi TLP tests (BHP/Modec/Sea Engineering, 2005)
  • Snorre TLP tests (AkerKvaerner/Statoil, 2004)
  • West Seno TLP (Unocal, 2000)
  • Deepstar TLP (Deepstart, 2000)
  • MOSES TLP (Sea Engineering, 1995)
Most recent papers on TLPs presented by MARIN
(complete overview of papers can be found under Publications)

A Study on Simplified Loading Models for Vertical Wave-in-deck Loading
Jule Scharnke, Wim Lafeber , ISOPE 26th International Ocean and Polar Engineering Conference, Rhodes, Greece, 2016

Comparison of Second-Order Loads on a Tension-Leg Platform for Wind Turbines
Sébastien Gueydon (MARIN), Pierre-Yves Wuillaume (MARIN Academy), Jason Jonkman, Amy Robertson, Andrew Platt (NREL), Twenty-fifth International Society of Offshore and Polar Engineers (ISOPE) conference, Hawaii, 2015

Highly efficient Tension Leg Platform design, testing and analysis
MARIN Report, 2015

Complex model tests on MOHO NORD Tension Leg Platform
Arjen Koop & Jule Scharnke, MARIN Report, 2013

Deepwater pit proves popular for TLP model tests
Jorrit-Jan Serraris, Eelco Frickel & Jule Scharnke, MARIN Report, 2011

Most recent TLP articles written for MARIN Report
(complete overview of articles can be found under Publications)

A Study on Simplified Loading Models for Vertical Wave-in-deck Loading
Wave-in-deck model tests were carried out with vertical load measurements, pressure measurements and a two camera high speed video setup. With the undisturbed surface elevation at every time step, the load transfer to a flat...

Comparison of Second-Order Loads on a Tension-Leg Platform for Wind Turbines
The first objective of this work is to compare the two floating offshore wind turbine simulation packages; (DIFFRAC+aNySIM) and (WAMIT+FAST). The focus of this study is on second-order wave loads; therefore, first- and...

Highly efficient Tension Leg Platform design, testing and analysis
Highly efficient Tension Leg Platform design, testing and analysis

Complex model tests on MOHO NORD Tension Leg Platform
In an ambitious campaign the MOHO NORD TLP was extensively tested in wind, waves and current.

Deepwater pit proves popular for TLP model tests
MARIN’s deepwater pit in the Offshore Basin allows modeling of TLPs, including their tendons, over the full water depth. Here, we delve the inner depths of the deepwater pit and examine these challenging projects.

Contact
For more information on how MARIN can help your organisation with TLPs, please contact:

For model test and simulation activities: Offshore Department
For full scale measurements: Trials and Monitoring Department

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