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Singapore: GILLS PTE LTD receives AiP from BV for vessel hull air lubrication system

12 May 2021

Singapore-based maritime technology firm GILLS PTE LTD has been awarded approval in principle (AiP) from classification society Bureau Veritas (BV) for its underwater hull air lubrication system.

The AiP covers the design of the system and installation onboard vessels as reviewed against the Bureau Veritas Rules for Steel Ships NR 467 (as updated in January 2021).

GILLS, which stands for gas injected liquid lubrication systems, deploys NACA profiles developed by the National Advisory Committee for Aeronautics to create self-generating micro-bubbles for ‘turbulent modulation’ which has a ‘hull-tightening’ effect, reducing drag and energy requirements.

The self-generating nature of micro-bubble clouds with no requirement for air-compression and additional energy requirements is one of the features of the GILLS system.

The hull tightening effect of the GILLS technology is a phenomenon of the various factors and forces acting on the microbubbles generated by a GILLS vortex generator installed at the bow of the ship. These factors and forces can be identified as the following:

  • A ship’s forward movement
  • Creation of microbubbles by negative pressure and Kelvin Helmholtz Instability (KHI) exiting the vortex generator
  • The random shape of microbubbles with turbulence, eddies and vortices, from KHI
  • Buoyancy acting on the micro bubbles inducing an upward force
  • Shape of the hull

“The GILLS Air Lubrication System is a nature based innovative technology that not only uses the micro bubbles to reduce the drag, emissions, fuel and biofouling, but it also utilises the ship speed to generate a negative pressure and minimizes the required external compressor power,” explains Peter Kneipp, Managing Director of GILLS PTE LTD.

“We are greatly confident that GILLS will be a valuable contributor for practically every ship type to improve the EEDI /EEXI IMO Index. GILLS can also be retrofitted to existing ships as well as new vessels.”

“The collaboration with GILLS is timely as the industry seeks performance improvements in line with the EEXI energy efficiency targets. Pressure is building to find cost-effective solutions that work and can be financed,” said David Barrow, SE Asia Zone Vice-President for Bureau Veritas.

“The GILLS systems has been installed on an existing vessel for a number of years now and the vessel owners are confident of the fuel savings are approximately 10%.

“The next step is a full-scale measurement and a validation exercise led by Bureau Veritas Solutions (BVS) to identify confirmed performance.

“BVS, our consultancy arm, is also working with GILLS to assess the potential of access to Singapore ‘Green Funds’ to provide financial support to owners considering using such energy-saving systems.”

 

Photo credit: Bureau Veritas
Published: 12 May, 2021

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