Page 11: of Marine News Magazine (April 2021)

Offshore Energy

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All images: BMT

The vessel is also equipped with a selective catalytic re-

The BMT-designed ferry Enetai was duction (SCR) system, one for each engine, toward com- recently built and delivered to Kitsap Transit. pliance with EPA Tier 4 requirements. This system repre-

To start off, will you please give an overview sents in volume about the same size as the engine with a of the vessel and the project with insights weight for about ? ve tonnes, so for a high-speed craft it’s on what you believe makes this vessel and a huge design driver. To put that into context, this weight this series unique?

SJ: As a general introduction, Enetai is the ? rst of two equates to about 70 passengers or serves a total passenger 140-foot high-speed catamarans. They are built by Nichols capacity of the vessel. So, a signi? cant amount of time and

Brothers Boat Builders on the U.S. West Coast to a BMT work has been done to ensure good integration of the sys- design. Sister vessel Commander is due to be launched tem for the maintenance aspect, but also to limit the added later this year, and still to exactly the same spec. The vessel weight impact on performance and fuel consumption.

The result of that work is a 38-knot vessel, with a cruis- has a capacity of 255 passengers on a single deck, and with ing speed in normal service condition of 35 knots. In fact, dedicated storage for 26 bikes.

It is designed with a characteristic round foredeck shape the design performance was a contract requirement, and common to many larger ferries operating in the area to this is a result of a couple of things. First, BMT and Nich- ensure good interface with the existing infrastructure. The ols Brothers embarked on a very strict weight control pro- vessel is designed around a twin shaft propulsion system, cess to ensure that weight targets were met. From equip- so it’s an mtu 4000 engine and Kongsberg waterjets. This ment selection to review of small details, every aspect of design also includes an active ride control system by Naiad, the design was reviewed to ensure a lightweight solution. which provides very good ride comfort at high speed in the The hull form has been designed speci? cally to address the additional weight and added space required for the SCR rough seas that it’s coming across.