Chinese yard China Merchants Heavy Industry (CMHI) has started sea trials for the second of the twin semi-submersible crane vessels (SSCV) built for Netherlands-based offshore heavy-lift specialist OOS International.

During the sea trials, which started on Sunday, CMHI will also install the thruster for the vessel, named as OOS Walcheren with hull number CMHI 16302.

Informed sources said the OOS Walcheren may have already secured a contract with a Chinese marine service contractor to install offshore wind farms, although this could not be confirmed.

OOS in 2016 offered a contract to CMHI to build the two flotels, each with two giant cranes, with dual-lifting capacity of 4400 tonnes and able to accommodate 750 people.

The first unit, OOS Serooskerke, was delivered last year and is now understood to work for China Railway Major Bridge Engineering, installing offshore wind farms in China.

OOS heavylift accommodation vessel hits water

OOS said the OOS Serooskerke and OOS Walcheren are identical sister semisub crane vessels.

Each is equipped with a dynamic positioning system, STX-MAN diesel engines and Thrustmaster thrusters fitted with a condition monitoring systems, OOS said earlier.

The Ulstein-design vessels will be used to install wind turbine foundations, fixed platforms, mooring systems, floating structures, subsea structures and foundations.

They will also be able to carry out satellite tie-backs and decommissioning work.