According to a MarineLink article, Crowley Fuels has signed construction contracts to build a 55,000-barrel articulated tug-barge (ATB) designed to serve the Western Alaska market with delivery of clean fuel products.
Features satisfying demanding conditions
The 410-foot ATB will have enhanced performance features for the demanding river and sea conditions of Western Alaska, an area that depends on safe and reliable marine delivery services during the short open-water season.
An ATB consists of a tugboat and barge that are connected from the bow of the tug to a notch in the stern of the barge by a hinged connection system, allowing the two vessels to work as one.
Parties involved in ATB construction
- The tug will be constructed by Master Boat Builders of Bayou La Batre, Ala.
- The 350-foot barge will be built by Gunderson Marine LLC, a wholly owned subsidiary of the Greenbrier Companies, Inc., in Portland, Ore.
The ATB is expected to be delivered in January 2021.
Design of the ATB
Design of the ATB was completed by Crowley Maritime Corp. subsidiary Jensen Maritime, a Seattle-based naval architecture and marine engineering firm.
Crowley’s project management group will provide
- plan review,
- on-site construction management in the shipyards, and
- will work with Crowley Fuels to transition the vessel into service.
ABS Ice Class and IMO Polar Code requirements
The ATB will meet all ABS Ice Class and IMO Polar Code requirements. Features include
- increased structural framing,
- shell plating, and
- extended zero discharge endurance.
The tug and barge are designed with shallow operating draft to allow the vessel to serve several Alaska river terminals with limited water depths.
Additionally, the ATB will feature the capability to perform nearshore ship-to-ship cargo transfers.
What is the ATB equipped with?
- The barge will be fitted with an azimuthing pump jet bow thruster to provide enhanced maneuverability and station keeping capability.
- The tug will be fitted with two GE 6L250 main engines that meet U.S. Environmental Protection Agency’s Tier IV environmental standards.
- The tug has azimuthing stern drives to enhance maneuverability, and an Intercon C-series coupler system.
- To provide off-ship firefighting capabilities to the barge, the tug is equipped with a fire monitor and foam proportioner.
- The ATB will include a full complement of spill response gear, including 2,000 feet of boom and a work skiff to meet State of Alaska requirements.
Crowley’s 100,000-barrel ATB
Crowley operates and manages the largest U.S.-flag petroleum and chemical tank vessel fleet in the U.S., including 40 Jones Act-qualified, large petroleum transportation vessels with a combined capacity of more than 12 million barrels. Its ATBs, tankers and other vessels regularly serve Alaska, including barge fuel delivery.
This new ATB will follow the completion of Crowley’s 100,000-barrel ATB now finishing construction at Bollinger Shipyards for service under charter in Alaska to Petro Star Inc., a wholly-owned subsidiary of Arctic Slope Regional Corporation (ASRC).
The barge will be named Oliver Leavitt, in honor of ASRC’s former chairman and a current member of the corporation’s board of directors, and the tug will be named Aveogan, Leavitt’s Iñupiat name.
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Source: MarineLink
