ComFLOW used for green water assessment Ningaloo Vision FPSO
Robert Heerink
r.heerink@marin.nl
MARIN has been awarded a contract by Prosafe Production Services Pte Ltd to perform a numerical study for the green water assessment of the Ningaloo Vision FPSO. Part of the study involved the design of a breakwater construction at the bow of the FPSO.
COMFLOW, a program for the numerical simulation of fluid flow, was used for the study. COMFLOW was ini- tially developed by the University of Groningen but in close cooperation with MARIN, the metho dology was later extended to encompass the calcu lation of green water loading on a fixed bow deck, including model tests for verification and the analysis of anti-roll tanks. A number of different designs were calculated and analysed to optimise the size and shape of the
breakwater construction and to minimise the amount of green water flowing on to the deck in extreme weather conditions.
Results of the analysis show the amount of green water flowing on to the deck and pressure distributions at the breakwater construction. These results were then used by Prosafe to build the actual breakwater construction.
The numerical ComFLOW simulation and the actual structure of the green water canopy
Frigg QP jacket gets ‘on the move’ at MARIN
Joris van den Berg
j.v.d.berg@
marin.nl
Saipem UK wished to enhance its knowledge of the behaviour of its SSCV “S7000” for a removal and transportation solution for both the lifting and towing of the Frigg QP Jacket structure. Saipem asked MARIN to perform tests to study the S7000’s overall behaviour, together with the Jacket structure in the hooks. The complete Jacket structure is set to be tandem lifted in the main crane hooks and towed from its present location in the Frigg Field to the scrap facility at Stord, Norway. Although the lift and tow is scheduled for July/August, the platform was already ‘on the move’ in MARIN’s Offshore Basin in February 2009. MARIN made a detailed scale model of the Frigg QP jacket for the tests, including the buoyancy and weight distribution of the Jacket in its present state. The magnitude of sling loadings, the overall stability of the towing arrangement, the relative clearances between the S7000 and Jacket, and their
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global motions and accelerations, were of particular interest during the tests. The results were used by Saipem’s engineers
and operational people to design and plan the last trip of the platform after more than 30 years of service.
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