Abstract: The disclosure relates to a floating oil/gas production terminal comprising a multi-hull vessel having a plurality of vertically spaced barge form hulls interconnected together to form a unitary structure including an upper hull which floats the vessel and a lower hull which provides gas/oil/other liquid storage space. A vertical throughway extends through the hulls towards one end thereof and a manifold system is disposed in the free space between the hulls and is mounted for rotation on the upper and/or lower hulls about a vertical axis extending through the throughway to receive a plurality of pipelines connected directly or indirectly to seabed wellheads. A rotary fluid coupling is provided having two elements relatively rotatable about the vertical axis.