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Normally this kind of operation would cause a disruption of several days to our client. The drone survey took only a few hours and was just as effective,” says Ian Young, Chief Operating Officer at Prosafe.


The challenges To get to this point, Galinski’s team has gone through years of experiments, modifications and practice runs. And even after optimizing the technology, flying drones on maritime structures comes with its own set of challenges. “When inspecting the cargo hold of a large oil tanker, for example, you have to fly the drone about 30 metres away in the dark. In addition, the pilots are surrounded by thousands of tonnes of steel, which means that the drone’s GPS and magnetic compass, which usually help it identify its position, don’t work – nor does its positioning support. This makes its behaviour somewhat unpredictable,” says Galinski. “If you fly a drone in your garden with the position- keeping function enabled, you can push it away and it will automatically return to where it was before. On a ship, any sudden input may cause the drone to become unstable and require the pilot to correct its position manually,” he adds.


i


DRONE TYPE INFO _____________________


MAVIC


The Mavic drone is the DJI Phantom’s smaller cousin. Its tripod mode slows down its operational speed considerably,


making it ideal for slow manoeuvring and close- up surveys, where it gets as close as one metre to the structure.


DNV GL drone surveyor Leszek Alba tests the Custom drone outside the Gdynia office.


Photos: DNV GL


64 | The Report • March 2018 • Issue 83


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