The development of the HZ 21 and HZ 26 oilfields offshore People's Republic of China incorporates a tanker based FPSO. The FPSO is moored by means of a disconnectable mooring system which allows the FPSO to leave the site in the event of an approaching typhoon.

The mooring system is one of a novel design in which the mooring buoy floats below sea level when disconnected, and in the connected mode is joined to a turret in the tanker's forepeak. The system was commissioned during early September 1990, and this paper gives a description of the design, construction and installation of the system and resumes the experience gained during the first twelve months of operation.

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