Page 20: of Maritime Reporter Magazine (December 2019)

Great Ships of 2019

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In May 2017, MOL decided to build those escort duties. It has a top speed of tank is not removed, but it can be, for backup to LNG fuel, and can be operat- an LNG-fueled tugboat that would be 16 knots, a fast tugboat and something example, when the Ishin is docked for ed in both Gas Mode (running on LNG) operated by Nihon Tug-Boat Co., Ltd. It of a rarity in its class. Generally, ship regular maintenance. To achieve this and Diesel Mode (running on heavy oil was built by Kanagawa Dockyard Co., maneuverability and high-speed sailing con? guration, the LNG fuel-gas sup- A). LNG is gasi? ed using exhaust heat

Ltd., has dual-fueled engines from Yan- tend to contradict each other, but this ply system is integrated with the tank from the engine, and supplied to the en- mar Co., Ltd., and runs on LNG supplied ship reconciles both needs. This is one of to make a very compact structure. As gine. The gas is mixed with air and ig- by Osaka Gas Co., Ltd. The LNG-fueled the Ishin’s major characteristics. In addi- a result, the risk of a liquid spill is sig- nited with an extremely small amount of tugboat, called Ishin, was delivered in tion, many tugboats today are equipped ni? cantly reduced because the design heavy oil A to create the explosion that

February of 2019. Ishin is Japan’s ? rst with an azimuth thruster, which allows minimizes the area where onboard leaks produces power in the cylinders.

tugboat built to conform to the Interna- the propeller to rotate 360° around the might occur during operation. In addi- tional Code of Safety for Ships Using vertical axis. The Ishin is equipped with tion, the piping from intake port to tank

Gases or Other Low-? ashpoint Fuels two of these propellers, each of which is is shortened to minimize the effect of (IGF Code). MOL conducted a demon- driven directly by an engine. The Ishin heat load on the piping when bunkering

Ishin Youthful Main Particulars stration test to supply LNG to the LNG- can be freely moved forward and back- the vessel from an external source.

Vessel Type LNG-fuelled tug fueled tugboat Ishin in the port of Kobe ward, port and starboard by changing the The LNG fuel tank has a vacuum-insu-

Shipbuilder KANAGAWA Dockyard Co.,Ltb

Material steel and Nagoya. The test con? rmed that engine rpm and the direction of the 360° lated, double-hull structure, kind of like

Owner Mitsui O.S.K. Lines

LNG can be safely supplied to vessels at rotating propellers. By making full use a large thermos bottle. It can maintain

Operator Mitsui O.S.K. Lines

Ship Designer Mitsui O.S.K. Lines the port. of this feature, the Ishin can more effec- the temperature inside the tank longer

Delivery Date February 2019 tively assist large-size vessels in berth- than general ocean-going LNG carriers,

Length, (o.a.) 43.6m

Inside Ishin ing and un-berthing. because the heat load is small and pres-

Length, (b.p.) 38.75m

Breadth, (molded) 9.2m

The tugboat’s role is to support large- sure can be contained inside the tank.

Depth, (molded) 3.99m size vessels in port, as well as escorting LNG Bunkering System

Draft, (designed) 3.15m

Speed 16.4kt large vessels plying Osaka-Bay and the The most obvious feature of the Ishin Dual-Fuel Engines

Fuel Type LNG / Diesel oil

Setonaikai Inland Sea. So the Ishin not is the arrangement of the LNG fuel tank, The Ishin adopts dual-fueled engines,

Main engines YANMAR 6EY26DF only has to deliver optimum performance which is positioned on the rear deck and which can run on both LNG and heavy

Total installed power 1618kW×750rpm×2set in port, but also high-speed operation for is a removable structure. Normally, the oil. These engines use heavy oil A as a

Japan’s ? rst LNG fueled tugboat applying IGF Code

Photos: Mitsui O.S.K. Lines 20 Maritime Reporter & Engineering News • DECEMBER 2019

MR #12 (18-25).indd 20 12/6/2019 10:34:57 AM

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