Selektope scores more success with tankers

Paul Gunton
ShipInsight

08 May 2019


Bermudan tanker owner and operator Team Tankers International has committed four additional ships to using the protection of the anti-barnacle active agent Selektope following highly satisfactory fouling prevention performance during a 40-month trial of a coating containing the technology on an MR tanker in their fleet.

The vertical sides of the 46,067dwt chemical and products carrier Team Calypso were coated with Chugoku Marine Paints’ SEAFLO NEO CF-Premium antifouling coating that contains Selektope during its five-year drydocking at the Sembcorp shipyard, Singapore in 2015.

Selektope

During the last 40 months the MR tanker has been in active operation across a wide range of trade routes globally, often sailing in global biofouling hotspots with > 25°C (up to 32°C) water temperatures where the risk of biofouling is very high. The vessel has also spent several extended periods idling in these zones.

However, during the trial, barnacles failed to anchor themselves to the tanker’s hull thanks to the protection from Selektope which activates the barnacle larvae’s octopamine receptor, keeping them in swimming mode and preventing them from attaching to the hull with non-fatal effect.

A hull inspection conducted at month 35 in the tanker’s in-water-survey schedule established that Team Calypso’s hull was virtually barnacle free with no soft fouling coverage. Independent third-party data analysis has also verified the fouling prevention performance. At month 40, total added resistance on Team Calypso’s hull and propeller due to fouling is exceptionally low, at 16%, compared to up to 30% expected for a reference ship of similar age, size and trading patterns. Of that 16% total, added resistance on the hull accounted for 10% whereas added resistance on the propeller accounted for the remaining 6%. The development of added resistance was calculated at a rate equivalent to 0.4% per month, compared to the expected rate of between 0.5% and 1.5%.