Renewal of DRAGADOS OFFSHORE, S.A. qualification in the Achilles Joint Qualification System and Sellihca Nordic Utility Pre-Qualification System. January 5th, 2016 Dragados Offshore, S.A. has proved again to count with a certified quality system established and documented in accordance with Achilles international quality standard. Both Achilles systems are used by leading oil companies and main contractors worldwide to select bidders lists for their major contracts. These certifications are valid till January 2017. To view the corresponding certificates please refer to next link.