PRA-1 CALM Buoys

The PRA-1 buoys are two Identical turntable type Catenery Anchor Leg Mooring (CALM) Buoys and were built for Petrobras.

The buoys have mooring systems consisting of 9 95mm R3S mooring legs, four 12” production risers four 42” I-Tubes and one umbilical.

Each buoy has an 18m dia x 7m high body that weighs 890 tons with a draft of 4.73m and each has a 25 year design life. The buoys' flow rates are 250,000m3/day (per buoy) to accommodate an export tanker of up to 322,000 dwt.

The first PRA-1 CALM Buoy has been installed in 85m of water. Stabilized oil from the Marlim Sul, Roncador, and Marlim Leste fields is sent to the PRA-1 platform which then pumps the oil to the FSO (Floating Storage and Offloading) and the PRA-1 CALM Buoy for tanker loading.