The shuttle tankers have a capacity of 42,000 dwt each and they are capable of traversing the Arctic Ocean.
The newbuildings are scheduled to be completed by April 2017.
With the latest deal, SHI has a combined total of $5.9bn in orders, and more orders are expected later this year, according to the shipbuilder.
In July this year, SHI clinched a similar order worth $440m to build a trio of shuttle tankers for Sovcomflot.
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