Singapore Technologies Marine has won a third contract from a unit of Crowley Maritime Corporation to build four additional tug barges.
The contract is worth a total of $240.7m.
This contract will bring the total number of barges Crowley Maritime has ordered from ST Marine to 10.
The 10 vessels have a combined value of more than $536m, including the cost of owner furnished equipment.
Delivery for the latest four barges is expected between 2009 and 2010.
The vessels can transport refined products as well as heated cargoes and easy chemicals which require special arrangements.