The world’s first in-water remote ship surveys using a remotely operated vehicle (ROV) have been completed by classification society, DNV GL. In-water bottom surveys using ROVs have now been carried out on three separate Wilson ASA-managed vessels with the first having been completed on the Wilson Fedje in December 2019 by a surveyor from Høvik.
The latest in-water survey of this kind was performed earlier in July on another ASA Wilson-managed vessel in Bergen, Norway. Elias Triantafyllidis, the remote surveyor, attended the survey from the DNV GL DATE (Direct Access to Experts) hub in Piraeus, Greece.
As with the two previous surveys, it was conducted in collaboration with VUVI AS, a Norwegian inspection company certified by DNV GL to perform underwater inspections for ships and offshore platforms using ROVs.
Survey planning and review of hull drawings were completed the day prior to the survey, thereby optimizing the degree of survey assurance. During the inspection, the surveyor used VUVI’s sonar technology to scan the vessel’s bottom in order to locate the hull equipment, such as echo sounder sensors; speed log sensors and sea chests, while simultaneously assessing the general condition of the hull.
Seamless connectivity was ensured throughout the survey thanks to the use of a powerful router. The in-water survey was concluded in a similar timeframe to traditional surveys, i.e. two-and-a-half hours, achieving the same level of assurance as an in-person survey. DNV GL’s digital industry platform Veracity was used by VUVI AS, DNV GL and Wilson ASA to ensure secure data transfer when saving and sharing the video stream from the remote survey.
Statutory and class regulations require two bottom surveys of a vessel within a five-year period, with an interval of less than 36 months in between. The certification of VUVI AS was conducted in accordance with Class Programme DNV GL-CP0484 for in-water inspections.