Nichols Brothers Boat Builders (NBBB) has delivered Rachael Allen, the final ASD-90 tractor tug in a four-vessel series to Foss Maritime, a division of the Saltchuk company
The ASD-90-class tugs were designed by Seattle-based Jensen Maritime Consultants and are built to US Coast Guard Subchapter M regulatory standards, with ABS loadline certification and UWILD notation.
The Z-Drive tractor tugs were built to the most stringent emissions requirements, with two MTU Series 16v4000M65L main engines rated at 3433 HP each that meet the Environment Protection Agency’s (EPA) Tier 4 standards, reducing particulate emissions through in-cylinder combustion technologies and nitrogen oxide emissions to near zero through a selective catalytic reduction system.
The MTU SCR system will help reduce fuel consumption by 8% at full power and 14-22% over a wider operating range compared with previous MTU engines in this power range.
Th tugs also feature MTU’s digital monitoring system MTU Go, a service that allows continuous monitoring of the engines including all engine parameters and alarms, with trending and broadcast of engine alarms through the MTU Go App.
The MTU Series 4000 engines are paired with Kongsberg US255 azimuth thrusters with the propulsion system producing over 90 tonnes of bollard pull.
The tugs are outfitted with two different Mackay Marine Electronics and Markey winch packages. All four vessels are equipped with a Markey DEPGF-52R-75HP forward winch for ship assist. Two of the vessels are equipped with TESS-34AS-75HP rescue winch on the stern and two are equipped with DEPC-32 barge handling winch on the stern.
NBBB said Rachael Allen will be the first tugboat in the US delivered with the Sea Machines SM300 autonomous system, including transit autonomy and remote access of the tug’s onboard machinery, allowing personnel to manage and support operations from anywhere on board the vessel or from shore. The capability of the technology will be activated in stepped phases over the course of six to nine months to ensure full visibility and acceptance from all operational stakeholders.
Foss Maritime will use its Fleet Monitoring Centre personnel to monitor the tugboat’s systems and operating domain via streaming video and sensor data.
Foss Maritime president Will Roberts said “The ASD-90 newbuild programme produced three vessels for Foss and one vessel for our sister company AmNav.”
Rachael Allen is the fourth vessel in the series which includes Jamie Ann, Sarah Avrick and Leisa Florence. All four tugs were delivered between April 2020 and June 2021.
Two vessels will be stationed in Los Angeles/Long Beach, while the other two vessels will be in San Francisco Bay providing escort and assist services to large tankers and container ships calling at California ports.
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