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SDT was the first to pioneer on ultrasound-based hatch cover weathertightness testing on board of ships back in the late 1980s. Together with MacGregor, Lloyds Register of Shipping and IMCS, SDT was able to put ultrasound testing of hatch covers on the world map and make it the preferred method for testing hatch covers by charterers, shippers, P&I insurers and stakeholders in the marine industry. Another first position for SDT is that further development of the tightness testing equipment resulted in SDT launching the world’s first Class type approved and bespoke SHERLOG product range in 2000. Ever since, the SDT SHERLOG equipment became a symbol of reliable and professional hatch cover testing. As no solution is complete without training, SDT & IMCS developed the first and only training course for ultrasound testing of hatch covers in line with the IACS UR Z17 criteria.