CASE STUDIES

COPPER FREE SELEKTOPE-BASED ANTIFOULING - FULL APPLICATION: 46,067DWT IMO II CHEMICAL AND PRODUCTS TANKER CALYPSO

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A copper-free coating product containing Selektope was applied to the side walls of the 2010-built, 46,067dwt IMO II chemical and products tanker vessel Calypso during its first five-year survey at the Singapore yard Sembcorp.

Hydrodynamic analysis of performance data during the trial was carried out by independent party Propulsion Dynamics. Operating rates were measured by fuel oil consumption and power output.

Twenty-four months out of drydock, Calypso’s increased total resistance was calculated to be 7%, compared with a benchmark new vessel that would see an increase in resistance of 10-20%. This 7% increase in resistance corresponds to a mere 2% speed loss relative to sea trial performance. The increase in resistance from the propeller was 2%, with the remaining resistance being measured on the hull. Additionally, the independent analysis confirmed that the development rate of added resistance for Calypso is 0.1 % (normally 0.5% to 1.5% is expected).

The benchmark is made up of a wealth of different vessels with different coatings related to the size of the database within Propulsion Dynamics. This benchmark allows for the comparison of one ship to a large variety of similar vessels, thus addressing the problem case that it is not possible to compare equal ships to equal ships when analysing and contrasting coatings performance.

STATIC TESTS – WEST COAST OF SWEDEN

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Comparative results after 7 months in static conditions on the west coast of Sweden.

USE OF SELEKTOPE® IN POLYURETHANE MATERIAL

Normally polyurethane has no antifouling ability.

TEST 1

Test panels where casted with various polyurethanes containing 0-1% Selektope. These test panels were submerged under static conditions on a raft on the west coast of Sweden.

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Test 2

3-panel test conducted with only one formulation containing 0.37% Selektope versus a reference panel with 0% Selektope

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USE OF SELEKTOPE® IN SILICONE EPOXY COATINGS (HARD COATINGS)

Wearlon products (4545.76, 2020.98, F-2M, F-3M) with 0% Selektope (reference purposes) or 0.3% Selektope painted onto test panels (roller application). The test panels were submerged off the west coast of Sweden in April 2016.

At the 2 month inspection:

  • All reference panels had plenty of barnacle fouling.
  • Some of the test panels had a few barnacles attached
  • F-3M with 0.3% Selektope had no barnacles attached

At 18 months inspection (November 2017) (right hand side picture):

  • Panel coated with F-3M with addition of 0.3% selektope had no fouling.
  • Every other test panel was completely covered in fouling
  • I-Tech is currently testing with F-3M and F-6M professionally applied by spraying.
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