The contract with Cosco (Dalian) Shipyard is for four firm newbuildings plus options for an additional pair of vessels.
Delivery of the first of the Marin Teknikk-designed vessels is expected to take place in the fourth quarter of 2016.
Maersk said the newbuildings would be rated for operations in water depths of up to 3,000 metres.
The MT6027-design vessels will have a length of 137 metres, a beam of 27 metres and have a deadweight of 8,000t.
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