Air Lubrication System
X112. IMO GHG Strategy, CII, EEXI and EU Maritime RegulationDefinition
Technology that injects compressed air beneath a hull to reduce frictional resistance, typically delivering 5 to 10 percent fuel savings.
An air lubrication system pumps compressed air through outlets in a ship’s flat bottom to form a carpet of bubbles or an air film that cuts skin-friction drag, the largest resistance component for slow full-form ships. Net fuel savings typically run 5 to 10 percent after subtracting the compressor power, best on wide, shallow-draft bulkers, tankers, and cruise ships. The saved energy counts toward EEXI and CII, and the technology can be retrofitted, though sea state, trim, and hull form set the achievable benefit.
Source: MEPC efficiency-technology guidance