The Norwegian Maritime Authority met with DNV GL to discuss on developing an ultrasound system to check the keel bolts in wooden vessels, in order to avoid pulling them. Although, several studies have shown that ultrasound system has limitations and may not provide the right results, it still may be the only method to avoid pulling the keel bolts, the Authority commented.
Accordingly, the two parties though their meeting in Svolvær, they came to the conclusion that this method may be less...
https://safety4sea.com/partners-present-option-of-ultrasound-for-keel-bolts-monitoring/