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Hull air lubrication with no compressors

Early adopters researching hull air lubrication systems (ALSs) should take note, a 2nd generation variation is on the horizon bringing with it a new method of operation that requires no compressors, low power consumption and a tight control of bubble dynamics regardless of vessel type, speed or weather conditions.

Energy efficient ships are an important component in decarbonization these days, driven by the verification requirement of a vessel’s Energy Efficiency Existing Ship Index (EEXI) and the technical filing that takes place at the ship’s first, annual renewal survey (as part of the IAPP survey) after 1st January 2023. The EEXI is a one-time certification, but the Carbon Intensity Indicator (CII), which will be used to rate (ranging from good [A] to poor [E]) a ship’s efficiency in the transportation of goods or passengers, will also start in 2023. CII will have strict yearly emissions limits that carry with it a taxation on ships with higher emissions ratings.

Hull air lubrication systems (ALSs) have emerged as one of the leading options in assisting ships achieve EEXI and CII compliance. The general operative principle behind an ALS is the delivery of bubbles under the ship’s hull to create a layer of aerated water to reduce friction between the hull and seawater, which consequently reduces fuel consumption and emissions. Most ALS use compressors which are operated continuously to replenish the air needed to produce this desired effect.

Tanker Operator’s early 2023 edition featured an article on Armada’s revolutionary new ‘passive air lubrication system’ PALS technology. Click HERE to read the article, ‘Hull air lubrication with no compressors’.

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