HANSA 05-2019

Schiffstechnik | Ship Technology
Scheme of static/dynamic ageing protocol that will reveal foul release properties of hull coatings
© Endures
tion times can be investigated. Results
that are obtained are twofold:
1) what is the minimal speed at which
fouling starts to be washed off and
2) what speed/rotation regime is required
to get a fully cleaned coating surface.
This way different coating products
can be compared on foul release properties
at various sailing speeds and after
various idle times.
Idle day’s tolerance
test for hull coatings
As an extension of the method described
above we have developed a cyclic test protocol
in which hull coatings can be subjected
to repeated static/dynamic ageing
periods and tested on fouling release after
each raft exposure period. The test cycle
can start with a dynamic phase (simulating
vessel operation at certain speed)
followed by a static idle time or the other
way around. Repeating the cycle several
times may reveal the long term drag performance
of hull coatings.
Authors
Job Klijnstra & Mark Bakker
Endures BV, Den Helder,
The Netherlands
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HANSA International Maritime Journal 05 | 2019
Independent
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