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Battery-fuelled pulling power


Navtek Naval Technologies is close to completing the all-electric ZeeTug, scheduled to enter service next year in the Port of Istanbul


T


urkey is gearing up to launch what has been billed as the world’s first all-electric tug, reliant solely on


battery power for bollard pull. As of late October 2018, the first-in-


class example of the anticipated Zero Emissions Electric Tug, or ZeeTug for short, was nearing completion at Navtek Naval Technologies’ Istanbul yard, which has confirmed that it is on track to deliver the newbuild in early 2019. A subsidiary of TK Tuzla Shipyard, Navtek has a strong pedigree in oil/chemical tanker and cargo vessel production, which makes the development of the ZeeTug an interesting special project for the designer/builder. The completed ZeeTug, or Navtek


design NV-712, will mainly operate inside the Port of Istanbul, under the management of GİSAŞ


Shipbuilding


Industry Co, whose commercial spread includes the provision of port services within this zone. Te newbuild will also be able to conduct emissions-free tasks in the Sea of Marmara. Te ZeeTug has been custom-designed


to meet GİSAŞ’ specific operational requirements: as Navtek vice chairman of the board Orkun Özek has previously put it, the tug “is small, and will work in a very narrow and tight environment, which is why we opted for a fully electric, battery-powered propulsion system rather than a hybrid solution”. Fatih Dönmez, Navtek technical manager, tells Ship & Boat International: “GİSAŞ is planning to replace four of its existing tugs with ZeeTugs,” thus signalling a long-term commitment towards curbing emissions in and around the Tuzla ports zone.


Shore-side charging Te 18.7m newbuild is being equipped with a Corvus Orca energy storage system (ESS), comprising two battery packs manufactured by green craſt tech specialist Corvus Energy. Featuring a total energy storage capacity of 1,484kWh, the ESS will feed two 968kWe Siemens propulsion motors using fixed-pitch propellers.


ABB has been contracted to provide the thrusters and drive systems. Assembly of the combined propulsive package has been overseen by Turkish marine systems integrator BMA Technology, which has also provided a back-up alarm monitoring and control system. “ZeeTug will undertake harbour


towing duties during day time and will be recharged overnight,” Dönmez explains. “One charging per day, via shore-side connection, is enough for its operational needs.” He estimates that, in its current environment, ZeeTug’s batteries can be fully charged within an hour – though,


TECHNICAL PARTICULARS ZeeTug (aka Navtek NV-712)


Length, oa ....................................................18.7m Breadth ........................................................... 6.7m Depth ............................................................4.65m Draught .......................................................... 3.5m Gross tonnage .....................................112tonnes Speed .........................................................10knots Bollard pull ...............................................31tonnes Crew.......................................................................4


Ship & Boat International November/December 2018


depending on the shore-side connection capacity, this time could be reduced to half an hour with the same battery arrangement (in other locations, for example). Also, as Corvus Energy points out, while it is relatively easy to predict charging periods and consequent operational range for ferries and passenger vessels undertaking fixed, regular routes, the flexible and varied nature of tug work makes it harder to establish a ‘concrete’ figure when it comes to charge times and energy usage.


Support via STEMS Navtek is also developing a tailor-made, mission-specific support tool for GİSAŞ, monikered the Smart Tugboat Energy Management System (STEMS), which will accompany the handover of


the


innovative vessel. Dönmez says: “STEMS will enable communication with all ZeeTugs from shore and will monitor battery status and shore connection availability, predicting time and energy for the next ship towing operation.” Te vessel will accommodate up to four


crew members and feature a towing hook capacity of 31tonnes bp. SBI


29


Due for delivery in early 2019, the ZeeTug will be fuelled by 1,484kWh of battery power


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