Robert Allan designs new ATB container ships for Brazil

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Written by

Nick Blenkey

The ATBs will be owned and operated by Maersk Group member Aliança Navegação e Logística (ANL)

Robert Allan Ltd., a naval architecture firm based in Vancouver, British Columbia, has been awarded a contract by Rio Maguari Shipyard (Estaleiro Rio Maguari – ERM), located in Belém, Brazil, to develop the design package of two Articulated Tugs and Barges (ATB) for shipping containers along the Brazilian coast. The ATBs will be owned and operated by a member of the Maersk Group Aliança Navegação e Logística (ANL)a leading logistics service provider in Latin America.

The ATB barge will have a container capacity of 700 TEUs
Each ATB barge will have a container capacity of approximately 700 TEUs

The Robert Allan Ltd. engineering team, led by Senior Projects Manager, James McCarthy, was tasked with developing an ATB suitable for operations along the entire coast of Brazil, including the south where the worst conditions are found. environmental issues along the Brazilian coast.

Design work began by engaging in-house experts with experience in computational fluid dynamics (CFD) and motion analysis to predict the ship’s responses to expected conditions, which served as the basis and direction for our processes. Design. The same team carried out extensive hull optimization studies with the aim of significantly reducing fuel consumption while providing excellent directional stability for ATB convoys. Analysis was also performed using the Proteus DS dynamic analysis package from Robert Allan Ltd. to check the pin loads at the ATB tug barge connecting pins and ensure that they were within allowable limits in extreme sea conditions.

ATB is designed for coastal operations
ATBs are designed for operations along the entire coast of Brazil

The ATB’s TRAnsfer 3800 tug component will be 37.5 meters long, 13.0 meters wide and 6.2 meters deep. It will have a marine diesel fuel storage capacity of 360 cubic meters and a fresh water capacity of 45 cubic meters.

Propulsion machinery will include two Wärtsilä 6L32 main engines, each delivering 3,200 kW at 750 rpm, and powering Schottel SRP630FP Z-drives with 3.4m propellers.

The ATB connection pins are Intercon model 34C, designed to allow the tug to remain in the berth during all loading/unloading operations by allowing relative vertical movement of the tug and barge while remaining connected. The fully air-conditioned and MLC-compliant accommodations are designed to a very high standard for a crew of up to 14, with a spacious and bright mess/salon, large cabins and a fitness room.

The tug is designed to American Bureau of Shipping (ABS) class requirements and to comply with Brazilian Flag Rules (NORMAM-01/DPC) with the following notation:

ABS ✠ A1 Tug ATB, Ⓔ + AMS, ABCU, BP, UWILD, PMP-CBM (Coastal Service)

Each barge will be 130.0 meters long by 28.0 meters wide and 8.0 meters deep, and will be able to carry approximately 700 TEU containers, including dangerous goods and reefer containers, split above and below from the bridge. The barges will be equipped with a 500 kW Schottel SST2 bow thruster and generators capable of powering the anti-listing system, the bow thruster and the refrigerated containers.

The barge is designed to American Bureau of Shipping (ABS) class requirements and to comply with Brazilian Flag Rules (NORMAM-01/DPC) with the following notation:

ABS ✠ A1 Ⓔ Barge (container barge), ATB, UWILD, CSC, CLP-V, domestic service in Brazil

These two new ATBs will significantly improve the coastal transport market in terms of fuel efficiency, operational safety, innovation and crew comfort.

After the construction of these vessels, the Rio Maguari shipyard will have completed an impressive total of 100 vessels designed by Robert Allan Ltd.

Categories: Coastal, News
Key words: MTB
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