The Effect of Biocide Free Foul Release Systems on Vessel Performance

Typical Increase in power/fuel required to maintain vessel speed of a fast fine ship vs increasing hull roughness

Typical Increase in power/fuel required to maintain vessel speed of a fast fine ship vs increasing hull roughness.

John Willsher
International Paint Ltd., London/UK

Introduction
The economic importance of underwater hull condition cannot be understated. Any increase in underwater hull roughness can result in a significant rise in vessel operating costs. There are two main types of hull roughness : physical and biological (fouling), each with their own macro (large scale) and micro (small scale) characteristics.

  • Macro physical roughness can be attributable to plate waviness, plate laps, seams and butts, welds and weld quality, mechanical damage and corrosion
  • Macro biological roughness is typically attributable to animal and weed fouling.
  • Micro physical roughness can be attributable to steel profile, minor corrosion and coating condition.
  • Micro biological roughness is typically attributable to slime fouling

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