Published 2022-06-15 00:00:00
Ulstein designing methanol-fuelled CSOVs for Acta Marine

Acta Marine orders the two first ULSTEIN TWIN X-STERN™ Construction Service Operation Vessels (CSOVs) with design from Ulstein Design & Solutions AS. The design contract also includes options for two vessels, all four of the SX216 design by Ulstein. The vessels will be delivered with dual-fuel methanol/diesel power generators.

“We are pleased to build on our existing relationship with Ulstein Design & Solutions AS for our next generation CSOV vessels combining Acta Marine’s operational experience and Ulstein’s innovative design capabilities,” states Rob Boer at Acta Marine.

TWIN X-STERN – Reduced motions, increased comfort and improved fuel efficiency

The ULSTEIN TWIN X-STERN™ has several characteristics, but the easiest way to describe it is as a ship with two sterns and four main propeller units: two at each end.

The proven X-STERN® at each end results in excellent operability with either end towards the weather, without limitation on vessel speed.

The TWIN-X-STERN designs from Ulstein share the characteristics of improved fuel efficiency, increased dynamic positioning (DP) capability and manoeuvrability, reduced motions and reduced noise. The TWIN X-STERN offers larger flexibility regarding the choice of propeller type, a bi-symmetric hull shape and propulsion setup with fewer propulsion units is possible.

Quality rest is needed for the technicians to perform safe operations. Ulstein’s designs provide secure access for the service personnel to offshore wind installations and ensure safe operations and comfortable accommodation for the onboard personnel.

Hybrid powered, with green methanol as the main source of energy

The CSOVs for Acta Marine have a hybrid power solution, with green methanol intended as the main source of energy. The Dual-Fuel engines are supported by a battery package, integrated into the vessel in such a way as to allow the most fuel-efficient modes of operation, reduced maintenance costs and reduced emissions.

As soon as methanol had been chosen as alternative energy source, Ulstein Design & Solutions started to adapt the design, implementing the methanol bunkering, tank and system layouts on a conceptual level.

Ulstein offshore wind service vessel designs
The offshore wind service vessel designs from Ulstein have been developed for effective support of the commissioning, operation and maintenance of the offshore wind farms.

The SX216 vessel has a length of 89,9m, a beam of 19,2m and accommodates up to 135 POB. It has a walk-to-work (W2W) motion compensated gangway for safe personnel transfer to the turbines, a 3D-motion-compensated crane for cargo tran

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