Ultrasonic antifouling

Ultrasonic antifouling is meant to reduce fouling on underwater structures, by using small-scale acoustic cavitation to destroy and discourage attachment of algae and other single-celled organisms.

Principle

Ultrasonic antifouling is based on destroying the micro fouling at the cellular level. By rupturing the cell walls of the organisms the system is supposed to prevent the basic elements of fouling from attaching to the hull.

Basically, the system generates gas bubbles in water. When the bubbles collapse, the local pressure prevents marine growth.

Main components

POWER CONTROL: Provides specific low powered ultrasonic frequencies.
TRANSDUCERS: Emitting the ultrasonic waves.

Methods

HARD CAVITATION: High intensity (>50 W). High and local pressure.
SOFT CAVITATION: Lower intensity. Generates conditions which prevent marine growth.

Does it work?

You may have seen adds where the ultrasonic maker claims this scientifically named system contains a breakthrough combination of ultrasonic waves and multiple frequencies. Some also argue that the waves result in a micro jet action creating a cleaning effect on the hulls surface below the waterline.

The challenge of avoiding marine fouling is complex. Ultrasonic treatment is a well proven technique for antifouling and cleaning, for certain industrial applications. However, in our experience with box coolers and sea chests, ultrasonic systems have not been sufficiently efficient, at least when installed singularly with no support from other active systems. In other words, conventional MGPS/ICAF is our recommended system for marine growth prevention. At least until further testing has taken place. MGPS/ICAF also contributes significantly to corrosion protection.

How can we assist you?

We encourage ship owners to take part in testing projects in a quest to optimising ultrasonic systems for future application. Let us know if you would like us to provide ultrasonic systems with the intention of testing, tuning and achieving the desired antifouling effect on one of your vessels.