In a statement the Portland, Oregon-based operator said the duo will boast carrying capacities of around 83,000-barrels a piece.
The company noted the construction contract was awarded to Vigor Industrial of the US and pointed out that the barges will be designed by Elliott Bay Design Group.
Upon delivery in the spring and summer of 2015 Harley indicated the units will be paired with tugs, at which point they will operate as articulated-tug barges (ATBs).
While