There are two main types of FPSOs, the converted Oil tanker option or the purpose built option. These might be disconnectable or permanently moored. The FPSO design will depend on the area of operation. In benign waters the FPSO may have a simple shape or it may be a converted tanker. Often an external Turret is applied in such areas e.g. West-Africa.
All ship-shaped FPSOs in the North Sea are purpose built and most are permanently moored. FPSOs may also be Semi-Submersible type platforms with storage or cylindrically shaped. These are moored in fixed orientation. An FPSO has the capability to carry out some form of oil separation process obviating the need for such facilities to be located on an oil platform. Partial separation may still be done on the oil platform to increase the oil capacity of the pipeline(s) to the FPSO
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