Air-lubrication of a ship’s hull really does pay off with significant fuel savings. Just a few days ago NYK Line announced that trials of the Mitsubishi Air Lubrication System (MALS) in not one, but two of its module carriers in a variety of normal operating conditions over a two-year period had been completed and confirmed an average 6% reduction in fuel consumption.
Long Term Operational Trial
An air-lubrication system was installed in each of twin-designed NYK-Hinode Line ocean-going vessels, the 19,800 dwt diesel-engined heavy equipment carriers ‘Yamatai’ and ‘Yamato’; the first in March 2010, and the other in the following November.
MV Yamatai: Photo credit NYK Line
These two ships are special heavy load carriers with roll-on, roll-off rampways for the transport of large prefabricated structures. Their propulsion system is by twin shaft CPP propellors, powered by a pair of Daihatsu 6DKM36 diesel engines, maximum rating 3.218 KW at 600/196 ... [More]
Energy saving, fuel economy of 15%, by reducing frictional drag on the immersed hull by means of injected streams of air bubbles has been proven effective by recently concluded practical tests. Two years of trials of a technology known as ‘Air Chamber Energy Saving’ (ACES) installed in a working Dutch inland waterway tanker back up this claim.
Damen Shipyards in Holland commissioned the exercise in the Dutch inland waterway tanker Till Deymann provided by subsidiary company Bodewes Binnenvaart back in 2009 on the heels of detailed analysis of tank-testing and computer modelling (at the Dutch Institute MARIN in Wageningen and DST laboratories in Duisberg, Germany), that indicated the time was right for putting ACES to the test under operational conditions.
Till Deymann, chosen for conversion in order to test out the ACES system, was a standard 'River Liner' type 11.45e product from the Damen yard, of 2858 dwt, with a LOA of 110 m, moulded breadth of 11.45 m, and a d... [More]