VESSEL REVIEW | Tanhai 9 – Chinese-built survey ship to support offshore wind industry

Photo: Seahead

A shipyard in China has completed construction on an oceanographic and geological survey vessel that will be used primarily to support the country’s offshore wind industry.

Designed by local naval architecture firm Zhejiang Seahead Ship Design and Research Institute (Seahead), Tanhai 9 (“Sea Exploration 9”) will be operated by the CIMC Group subsidiary Zhuhai Tanhai Ocean Technology, a company that specialises in marine research, surveys, and geological exploration and engineering services.

The vessel has all-steel construction, an LOA of 60.64 metres, a beam of 12 metres, a depth of 4.7 metres, and a maximum draught of three metres. A main engine drives two azimuthing rudder propellers to deliver a service speed of 11.5 knots and a range of 5,000 nautical miles. The streamlined hull bottom ensures a minimal wake during normal cruising, thus ensuring more accurate readings will be collected by the onboard survey equipment.

Aiding in the vessel’s research activities is a moonpool that measures 2.5 by 2.5 metres, an 18-tonne gantry, a knuckle boom crane, winches, and a dynamic positioning system. The onboard exploration drilling system can be used for engineering drilling and static penetration operations in anywhere from shallow waters to portions of seabed 150 metres deep.

Accommodations are available for a nine-strong crew and up to 14 additional personnel.

Tanhai 9
Type of vessel:Oceanographic survey vessel
Owner:CIMC Group, China
Operator:Zhuhai Tanhai Ocean Technology, China
Designer:Zhejiang Seahead Ship Design and Research Institute, China
Hull construction material:Steel
Superstructure construction material:Steel
Deck construction material:Steel
Length overall:60.64 metres
Beam:12 metres
Draught:3.0 metres
Depth:4.7 metres
Propulsion:2 x rudder propellers
Cruising speed:11.5 knots
Range:5,000 nautical miles
Other equipment installed:Moonpool
Operational area:China

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