OSG Ship Management has ordered a second 350,000 barrel articulated tug barge unit (ATB) at US shipyard VT Halter Marine.

The ATBs will be used to perform lightering services in the Delaware Bay and will be equipped to meet vapour balancing regulations.

The construction work will begin in November and is expected to be complete by mid-2010.

In April, OSG contracted VT Halter Marine to build a 350,000 barrel ATB, expected to be delivered by the end of the year.

VT Halter Marine, which is owned by Singapore’s ST Marine, has delivered nine ATBs to various customers over the last three years.