Objective
The 1979 sea test program had as one of its primary goals, the evaluation of the performance of the t.L.P. And a bank of twelve risers in water depths equivalent to 600 ft.
This goal was essentially attained with the successful testing for 95 days of the platform, the risers and auxiliary systems. The tests simulate, by a froude scaling ratio of 1 to 3, the operation of a t.L.P. And a riser system at a depth of 600 ft when conducted in 200 ft water depth.
During the program waves equivalent to 50 ft passed through the structure, with no platform or riser malfunction. Particularly noteworthy was the fact that the risers were run successfully during some of the worst weather and sea conditions.
The instrumentation and data acquisition system performed well without major problems, and a considerable amount of good, meaningful and viable data was recorded.
In addition to the structure, riser, tension member and anchorage data obtained a great deal of practical knowledge was also grained for example :
A) the towing of the platform to and from the test site
Location, with the anchors secured to the bottom of the
Columns, demonstratedthe stability of the t.L.P. Under
Tow at a towing speed significantly faster than predicted.
B) the successful deployment of the anchors from the t.L.P.
By the t.L.P.
C) the landing and retrieving of the sea-bed template from
The platform confirmed the ability to control the template
In a level attitude with a level indicator and subsea t.V.
D) riser running, latching to mandrel on template and
Tensioning were successfully accomplished despite tidal
Current with the aid of t.V. Monitoring at the template.
E) deployment of a composite riser bundle with little
Difficulty demonstrating the ease of operaton from a
Structure not subject to heave.
The analysis of the data ingathered that the frequency domain program made successful predictions for motion and leg tension response both at the design tension member stiffness and at a reduced stiffness value.
The time domain program also proved to be successful in predicting the platform motion when pulled off location and suddenly released.
The riser response was generally predicted well by the computer program in spite of the difficulties encountered in modelling exactly the end rotational stiffeners.
The overall conclusion is that the test program achieved its object and provided confirmation of the effectiveness of the design tools for use on a tension leg platform and associated equipment.
The project follows on from an earlier project carried out in 1975 on the one third scale model t.L.P. Which proved that the t.L.P. Was a viable concept and that its response in a seaway could be predicted with reasonable accuracy using a linearized frequency domain computer program. In this earlier project only a single riser was tested.
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Programme(s)
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Coordinator
RENFREWSHI PA DR
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.