Normally, transducers are dry-mounted on the inside of the vessel on the sea-chest to avoid fouling. To protect box-coolers, transducers are installed on top, that is on the water-covers of the box-cooler, and around it on the sea-chest walls. Objective is to protect the pipe bundle of the box-cooler. Installing on the water-cover means that the ultrasonic energy is transferred through the structure of the box-cooler, and through the cooling liquid, to the tube bundle. Installing on the sea-chest means that the ultrasonic signal has to travel from the sea-chest wall to the pipe bundle of the box-cooler. Both methods result in energy loss.
Delta-sistems has now developed a completely waterproof transducer with a mounting support that can be placed inside the sea-chest under the box-cooler. Thus, the ultrasonic signal will ‘shine directly’ on the tube bundle of the box-cooler. This transducer would ideally be combined with a transducer installed on the water-cover of the box-cooler. The challenge has been to develop a transducer housing that will remain waterproof for years, withstanding its own ultrasonic vibrations. The first prototype of this transducer is now ready, built of POM and stainless steel 316. It now needs to be installed in a sea-chest for real-life testing (ref to client participation in research). Once the first results of this research are in, we shall report about it on our website.