construction of Offshore Heavy Transport's (OHT) 48,000 dwt semi-submersible
offshore wind farm foundation installation vessel, Alfa
is progressing at CMHI Shipyard in China.
Currently 78 of the 162 blocks are installed in the dock. The hull structural
steel construction of the remaining blocks is also taking shape; in total
103 of the 162 blocks have reached the non-destructive testing completion
The vessel is expected to be ready for project deployment from early 2021.
The design has been developed by OHT in close cooperation with Ulstein
Design & Solutions BV, Liebherr and DNV GL. The vessel will fly the
flag of the Norwegian International Ship Register. It is designed to enable
the company to take on full transport and installation scopes for foundations
for offshore wind farms.
The custom-built offshore wind foundation installation vessel, featuring
a 3,000 ton Liebherr crane and more than 12,300 square metres of available
deck space. The main deck will incorporate an automated skidding system,
whilst the forecastle deck will carry transition pieces and mission equipment.
The vessel has a capacity to carry a total payload of up to 51,250 tonnes.
The vessel has a total length of 216.3m, and a breadth of 56m. It is said
to be capable of transporting and installing up to 10 x 1,500 ton jacket
foundations or 11 x 2,000 ton monopiles together with transition pieces
and mission equipment.
It is designed with battery hybrid propulsion, it has an exhaust gas scrubber
and is Tier III compliant, all in order to protect environment. To enhance
sea state limitations and reduce weather downtime, Alfa
has the capability to submerge offshore during the installation operation.
The vessel has been lined up for the construction of installation
of monopile foundations and transition pieces for the Doggerbank
Creyke Beck A
Creyke Beck B
offshore wind farms.
For more information on offshore wind
farm construction vessels, click