Refrigerated Liquefied Ammonia Barge

Photo of Harvest Barge on the Willamette River
  • Customer: Savage/The Mosaic Company
  • Industry: Transportation and Logistics
  • Type: Shipbuilding / Barges
  • Year: 2015

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.


Class name: Liquefied Ammonia Transport Barge
Type: ATB Tank Barge
Length: 508’3" (154.8m)
Beam: 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)
Cargo: Refrigerated Liquid NH3 at -27 degrees F
Other: Onboard re-liquefaction system for cargo maintenance
GENSETS: 4X940kW, 1X163kW
Fuel Storage: 27,250 Gal

Images from this Project

Click images to enlarge.

Photo of Harvest Barge on the Willamette River
Photo of cargo tank being offloaded from a ship
Photo of the deck of Harvest
Close up of piping aboard the Harvest
Piping aboard Harvest
Control panel