Single Point Moorings: The Rules Behind the Buoy

The Infrastructure Behind Every SPM Cargo Transfer

ABS's Rules for Building and Classing Single Point Moorings govern the design, construction, and classification of the buoy systems tankers connect to at offshore terminals worldwide. Recent revisions have refined technical criteria — including an adjustment factor accounting for higher-strength steels in buoy scantling calculations — and updated the moorings and anchoring section to reflect current industry practice, including the option to apply criteria from ABS's Floating Production Installations rules where relevant. A newer addition covers requirements for charging station installations aboard SPMs, reflecting how these structures are evolving beyond pure mooring and transfer functions.

What This Means for Tanker Officers Working SPM Terminals

• SPM connection and cargo transfer procedures depend on the buoy's classification and condition — familiarise yourself with any terminal-specific requirements before arrival, not on approach
• As SPM installations take on additional functions like charging stations, expect terminal procedures to evolve accordingly — confirm you're working from current guidance for each specific terminal

Related Reading

• Gangway, Tender, Shore — the same access-point discipline applies to SPM mooring operations