(57) A mooring system for the mooring of a tanker or production vessel at an offshore
oil production site comprises a plurality of anchor lines, for example four (1,2,3,4),
each having a sea-bed anchor at its distal end, an anchor line assembly unit (5) through
which passes at least one (2,3) of the anchor lines and to which each of the other
anchor lines (1,4) is secured at its proximal end, a swivel unit (6) to which the
proximal end of each passing anchor line (2,3) is attached, and a sub-surface buoyancy
device (7) also attached to the swivel unit, each passing anchor line (2,3) having
a stop member (12) for limiting the travel of the assembly unit (5) along the line
in a direction towards its distal end. A mooring line (8) is also attached to the
swivel unit (6), and a messenger line (9) having surface marker buoys (56) for location
and pick-up of the mooring is attached to the mooring line. In a loading or production
system at least one riser hose (10) is attached to the swivel unit (6) for communication
through the swivel unit to a respective continuation hose (11) for connection to the
moored vessel.
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