It is disclosed a disconnectable buoy, a spread mooring system, a floating installation, a computer program, and methods for connecting the floating installation to a seabed and for disconnecting the floating installation for production and/or storage of hydrocarbons using the spread mooring system. The spread mooring system comprises a disconnectable buoy, a first seabed mooring line assembly connected to the disconnectable buoy and the seabed, a second seabed mooring line assembly connected to the disconnectable buoy and the seabed and a third seabed mooring line assembly connectable to the floating installation and the seabed.