Page 71: of Maritime Reporter Magazine (November 2023)

Tech Files

Wärtsilä 31DF Engine ZF AT 90 Thruster Methanol Superstorage © Wärtsilä Corporation

Image courtesy ZF

Image courtesy LR/SRC Group the IMO, and is fairly easy to store and

Wärtsilä 31DF Engine Hydrogen Fueled Ship AIP

Wärtsilä introduced a new ultra-low handle, it takes twice as much to gener- emissions version of its Wärtsilä 31DF ate the same energy as HFO. On board engine. While operating on LNG, it is ship, this is a major storage issue, espe- designed to reduce methane emissions cially because low ? ashpoint fuel tanks on a 50 percent load point by up to 56 conventionally require cofferdams.

Although space penalties can be ad- percent and nitrogen oxide (NOx) by up

Image courtesy J-ENG to 86 percent. On a weighted average, dressed in newbuild ship design, even this new technology can reduce methane the youngest existing ships were not Heavy Industries, Ltd. (Kawasaki), Ja- emissions by 41 percent more than the built with retro? tting methanol in mind. pan Engine Corporation (J-ENG). This

Methanol Superstorage avoids coffer- standard Wärtsilä 31DF engine. is the world’s ? rst AiP certi? cation for dams by constructing tank walls using a ship equipped with a large low-speed

Sandwich Plate System Technology, in a two-stroke hydrogen-fueled engine as

ZF AT 90 Thruster solution boosting volume by up to 85%. the main propulsion engine. According

ZF said the latest product in its azi- muth thruster (AT) series, the ZF AT The gain can be retro? tted with minimal to the companies, demonstration opera- tion of the vessel will be conducted for 90, will be commercially available in impact on the general arrangement.

two years from around FY2027 as part

December 2023. This well-mounted, Z- of the “Development of marine hydro-

Hydrogen Fuel Ship AIP

Drive thruster is compatible with a wide

ClassNK issued an Approval in Princi- gen engines and Marine Hydrogen Fuel range of commercial vessels, support- ing max power of 1,978 kW/2,651hp, ple (AiP) for a parcel layout concept for System (Marine Hydrogen Fuel Tank a hydrogen-fueled multi-purpose ves- and Fuel Supply System)” which was increasing the power and thrust capa- bilities of the thruster product line. It sel developed by Mitsui O.S.K. Lines, adopted by Green Innovation Funding is fully customizable to nearly any hull Ltd. (MOL), MOL Drybulk Ltd. (MOL Program of the New Energy and Indus-

Drybulk), Onomichi Dockyard Co., trial Technology Development Organi- shape or vessel pro? le, and it also sup- ports auto-trolling. The ZF AT 90 can Ltd. (Onomichi Dockyard), Kawasaki zation (NEDO). be executed as part of a hybrid or fully electric system.

MAG DRILLS & ANNULAR CUTTERS

Methanol Superstorage

A new and space ef? cient retro? t

From small lightweight low profile mag drills to large multi-speed models and a wide range of methanol storage solution from SRC annular cutters, Hougen has the power, performance

Group has received Approval in Prin- & solutions for your holemaking needs.

ciple (AIP) from Lloyd’s Register (LR).

Methanol Superstorage offers the poten- tial for ships with years of service ahead to be considered for transition to this al- ternative marine fuel.

While renewably-sourced methanol ? ts the net-zero framework laid out by -426-7818 SERVICE • INTEGRITY 800-426-7818 SERVICE • INTEGRITY • RELIABILITY HOUGEN.COM www.marinelink.com 71

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