DNV secures approval from US Coast Guard
![Photo: Colourbox](https://photos.watchmedier.dk/watchmedier/resize:fill:3840:0:0/plain/https://photos.watchmedier.dk/Images/article5352862.ece/ALTERNATES/schema-16_9/COLOURBOX5836711.jpg)
Norwegian certification bureau Det Norske Veritas (DNV) has been approved by the US Coast Guard to certify ballast water cleaning systems.
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