A Comprehensive Look at Hull Air Lubrication Technologies
The European Maritime Safety Agency (EMSA) has released a detailed technical study examining Hull Air Lubrication Systems (ALS)—a technology designed to reduce hydrodynamic resistance and improve vessel efficiency.
As shipowners continue looking for practical ways to reduce fuel consumption and emissions from the existing fleet, air lubrication technologies have gained increasing attention. By introducing air into the boundary layer beneath the hull, these systems reduce friction between the vessel and the surrounding water, lowering propulsion resistance.
The EMSA report brings together a wide range of information on the current state of air lubrication technology, combining literature reviews, consultations with technology providers and shipyards, and performance assessments.
Evaluating Technology, Safety, and Economics
The study is structured around three primary areas of analysis:
- Technical and economic assessment
Evaluation of the potential efficiency gains and operational impacts of air lubrication systems across different vessel types. - Review of safety and environmental standards
Assessment of the current regulatory framework governing ALS technologies and identification of potential gaps or areas requiring additional guidance. - Safety assessment
A comprehensive hazard identification and risk analysis (HAZID) examining potential operational risks associated with ALS installation and operation.
For shipowners and engineers evaluating vessel efficiency technologies, the report provides one of the most comprehensive independent reviews currently available.
Passive Air Lubrication Recognized as a Distinct Category
The study also identifies Passive Air Lubrication Systems as a distinct category within the broader ALS technology landscape.
Unlike conventional systems that rely on compressors to inject air beneath the hull, passive systems use the venturi effect created by the vessel’s forward motion to draw air into the system. This air mixes with incoming seawater and forms a lubricating layer along the hull bottom.
Currently, Armada Technologies’ Passive Air Lubrication System (PALS) is the only passive air lubrication solution available on the market today.
Supporting Informed Decisions for Vessel Efficiency
As the maritime industry continues working toward emissions reduction targets, technologies that improve the efficiency of the existing global fleet will remain an important part of the solution.
Studies like this EMSA report help provide shipowners, naval architects, and regulators with the technical insights needed to evaluate emerging technologies and understand their potential impact on vessel performance.
Read the full report at https://armada-technologies.com/wp-content/uploads/2026/03/Hull-Air-Lubrication-Systems-Study.pdf
