Snorre TLP Configuration and Analysis Technology

Almeland, I-B.; Gaul, Th.; Pettersen, D.J.; Vogel, Harald

doi:10.4043/6622-ms

Cited by 4 publications

(4 citation statements)

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“…The 1:125 scaled model based on the SNORRE-A tension leg platform (Almeland et al, 1991) has been tested, with the platform deck modelled as a box-shaped structure. The main particulars of the platform at full scale and model scale are given in Table 1 and Figure 1.…”

Section: Tlp Modelmentioning

confidence: 99%

Experimental investigation of wave-in-deck impact events on a TLP model

et al. 2017

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Model tests were conducted to investigate the global response of a conventional tension leg platform (TLP) due to wave-in-deck loads associated with extreme wave events in irregular long-crested waves of a cyclonic sea state. The experimental setup was designed to allow for the simultaneous measurement of wave surface elevations, rigid body motions, tendon tensions, as well as the pressure distribution at the model's deck underside. The obtained results demonstrated the variability of all the measurements and provided insights into the effect of wave-in-deck loads on the platform behaviour, tendon tensions and slamming pressures and showed qualitative correlations between these parameters. Based on the repeated tests in several events with different wave parameters, general observations and conclusions were made with respect to the platform dynamics during the deck impact, tendon tensions, slack tendon situations, tendon ringing and local impact pressures. The results of this study could be used for calibrating computational fluid dynamics (CFD) tools.

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Section: Tlp Modelmentioning

confidence: 99%

Experimental investigation of wave-in-deck impact events on a TLP model

et al. 2017

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“…The TLP model was divided into two parts namely a hull module (columns and pontoons) and a topside deck module. The TLP hull module was represented by four circular columns and four square pontoons; the scaled model dimensions were based on the SNORRE-A TLP (Almeland et al, 1991). The main principles of the structure are given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of extreme wave impacts on a rigid TLP model in cyclonic conditions

Abdussamie

Ojeda

Drobyshevski³

et al. 2016

Ships and Offshore Structures

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Model tests of a moored tension leg platform (TLP) subjected to cyclonic conditions represented by deterministic regular waves were conducted with the aim of validating stateof-the-art two phase numerical simulations of wave-in-deck impact events. Tendon tension forces and localised slamming pressures at the deck underside were simultaneously measured using repeated runs. The computational fluid dynamics (CFD) simulations were based on the volume of fluid (VOF) method implemented in the commercial CFD code STAR-CCM+.The TLP's rigid body motions and the effect of tendons were simulated by means of an overset grid and massless spring lines, respectively. The global response and tendon tensions computed by the CFD code were found to be in good agreement with the measurements. The aft tendons were found to experience slackness following the deck impact in many wave cycles. CFD results showed that the downward component of the vertical wave-in-deck force was approximately synchronised with the minimum tendon tensions and evidently caused such slack situations. Although CFD simulations indicated that there was a strong interaction between water and air phases at the moment of impact, the air compressibility did not show a significant difference on the magnitude of impact pressures.

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“…The box dimensions were selected to represent, at a scale of 1:125, the 76 3 76 m centre-to-centre spacing between columns of the SNORRE-A TLP installed in 1992 at a water depth of 310 m in the Norwegian North Sea. 24 The model deck was fabricated using a 10-mm-thick aluminium plate for the bottom and 100 3 25 3 2.5 mm rectangular hollow sections (RHS) aluminium extrusions for the sides. The thickness of the model deck plate was selected using a finite element simulation to minimise the out-of-plane deformations so that the elastic effects could be neglected.…”

Section: Test Model and Instrumentation Detailsmentioning

confidence: 99%

“…The box dimensions were selected to represent, at a scale of 1:125, the 76 × 76 m centre-to-centre spacing between columns of the SNORRE-A TLP installed in 1992 at a water depth of 310 m in the Norwegian North Sea. 24…”

Section: Experimental Investigationmentioning

confidence: 99%

Measurements of global and local effects of wave impact on a fixed platform deck

Abdussamie

Ojeda

Thomas

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part M:

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This paper describes a series of model tests conducted to examine extreme wave events associated with tropical cyclonic conditions and their impacts on an offshore deck structure. Extreme waves of a representative cyclonic sea state were observed in a towing tank within long-crested irregular wave trains. Experimental results presented include global forces and localised slamming pressures acting on a rigidly mounted box-shaped deck, which represents a simplified topside structure of a tension leg platform (TLP). The effect of static set-down on the still-water air gap was investigated by applying an equivalent reduction for the deck clearance. It was found that a small reduction of 20 mm (2.5 m full scale) in the original deck clearance can lead to a doubly of the magnitude of the horizontal force and the vertical upward-directed force components, as well as significantly increase slamming pressures in many locations on the deck underside.

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Snorre TLP Configuration and Analysis Technology

Cited by 4 publications

References 0 publications

Experimental investigation of wave-in-deck impact events on a TLP model

Experimental investigation of wave-in-deck impact events on a TLP model

Experimental investigation of extreme wave impacts on a rigid TLP model in cyclonic conditions

Measurements of global and local effects of wave impact on a fixed platform deck

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