Refrigerated Liquefied Ammonia Barge

In the summer of 2017, Vigor launched The Harvest, the first complex liquefied ammonia transport barge built in the United States for Jones Act trade since 1982. The vessel was constructed to support the operations of The Mosaic Company, the world’s leading integrated producer and marketer of concentrated phosphate and potash. The Harvest is operated by a subsidiary of Savage Companies as part of an articulated tug and barge (ATB) unit.

Successful completion of the first US flagged liquefied gas carrier built in decades hinged on extensive project planning and management between Vigor, multiple contractors, designers and its customer, Savage. Careful integration of various complex systems was required to support the Harvest’s state-of-the-art, onboard re-liquefaction plant that keeps cargo cooled to -27 degrees Fahrenheit. Vigor subcontractor JH Kelly, based in Longview, Washington, was a key partner in this effort, providing the onboard electrical work as well as fabrication and installation of the cargo piping systems for the plant.

Watch a timelapse of the Harvest construction below.

Principal Characteristics

Class name

Liquefied Ammonia Transport Barge


ATB Tank Barge


508’3" (154.8m)


96’2” (29.3 m)

Draft (Full Load)

26’6” (8.1m)

Cargo Tank Capacity

22,000 ST

Cargo Tank

Type A Prismatic Tank, (4)


Refrigerated Liquid NH3 at -27 degrees F


Onboard re-liquefaction system for cargo maintenance


4X940kW, 1X163kW

Fuel Storage

27,250 Gal