Background
Tension Leg Platforms have proven their abilities for moderate water depths and are now planned for deep water. A number of issues in design, operation and inspection issues however need to be resolved. Such issues are:
• Actual wind (hurricane), wave and (loop) current conditions;
• Platform motions;
• Tensions in tendons and risers;
• VIV behavior of tendons and risers (including effect of fairings and strakes);
• Extreme loads and fatigue life of the platform.
The Marco Polo TLP was recently installed in 4300ft of water in the GoM. The 11,500 tonnes payload platform supports 6x13, 3/8” dual casing top tensioned risers, a 12” oil export SCR and an 18” gas export SCR.
In order to collect data to resolve the above issues, the partners in Marco Polo (GulfTerra, Anadarko, MODEC and SEA) decided to install a monitoring system on the platform. More specifically the envisaged monitoring campaign was aiming at:
• Effects of the large natural periods in heave, pitch and roll;
• Damping in the stiff modes of motion;
• Platform behavior in loop current;
• Effect of strakes on risers and fairings on tendons to restrict VIV;
• Platform in hurricane conditions;
• Fatigue life consumption.
To this end MARIN instrumented Marco Polo during the outfitting phase. In May 2004 the monitoring system was commissioned and from then on, data is collected continuously. As the monitoring campaign is of interest to all parties involved in deep water TLP’s and the results can be used for design, interested companies are invited to join the data analyses and evaluation of the results in a 3 year Joint Industry Project.
Tension Leg Platforms have proven their abilities for moderate water depths and are now planned for deep water. A number of issues in design, operation and inspection issues however need to be resolved. Such issues are:
• Actual wind (hurricane), wave and (loop) current conditions;
• Platform motions;
• Tensions in tendons and risers;
• VIV behavior of tendons and risers (including effect of fairings and strakes);
• Extreme loads and fatigue life of the platform.
The Marco Polo TLP was recently installed in 4300ft of water in the GoM. The 11,500 tonnes payload platform supports 6x13, 3/8” dual casing top tensioned risers, a 12” oil export SCR and an 18” gas export SCR.
In order to collect data to resolve the above issues, the partners in Marco Polo (GulfTerra, Anadarko, MODEC and SEA) decided to install a monitoring system on the platform. More specifically the envisaged monitoring campaign was aiming at:
• Effects of the large natural periods in heave, pitch and roll;
• Damping in the stiff modes of motion;
• Platform behavior in loop current;
• Effect of strakes on risers and fairings on tendons to restrict VIV;
• Platform in hurricane conditions;
• Fatigue life consumption.
To this end MARIN instrumented Marco Polo during the outfitting phase. In May 2004 the monitoring system was commissioned and from then on, data is collected continuously. As the monitoring campaign is of interest to all parties involved in deep water TLP’s and the results can be used for design, interested companies are invited to join the data analyses and evaluation of the results in a 3 year Joint Industry Project.
Objective
The JIP is aiming at the dynamic behavior of TLP’s in operational and survival condition and the verification of design methods and numerical analysis, to enable development of new TLP’s for even deeper water.
The JIP is aiming at the dynamic behavior of TLP’s in operational and survival condition and the verification of design methods and numerical analysis, to enable development of new TLP’s for even deeper water.
JIP proposal
Leaflet
Story in MARIN Report OTC special 2004
Marin Report article 'Ivan the Terrible'
Offshore Marine Technology article 'Ivan the Terrible'
Leaflet
Story in MARIN Report OTC special 2004
Marin Report article 'Ivan the Terrible'
Offshore Marine Technology article 'Ivan the Terrible'