Design of Havfarm 1

Emiel Mobron (7Waves)
Torgeir Torgersen (NSK)

The Norwegian government wants to five-double the production of salmon in Norway by 2050 and aims at opening new production sites. Since there is little space in the fjords and aquaculture in inland waters affects the local environment, solutions must be found to move production further out at sea. This poses challenges for the structures that support the fish-nets as traditional constructions are not able to handle the large loads from current and waves. New methods have to be developed that are able to withstand the environmental loads at sea, while being able to accommodate large quantities of salmon.

7Waves has been contracted by NSK Ship Design to perform the structural design and engineering of Havfarm 1, a permanently moored steel fish farm for offshore operation in the North of Norway. The Vessel is 385 meter long and 59.5 meter wide and has capacity for 10,000 ton salmon.

Since fatigue loads are large and the regulatory framework is not well-suited for vessels of this size, new methods were developed for calculating fatigue. Furthermore, well-known structural details from the oil and gas industry were incorporated in the steel-design. This led to a robust steel design, approved by DNV-GL. Construction of Havfarm 1 in China is nearing completion and operation is expected to start in the summer of 2020.

The project shows that more sustainable fish farming is now possible by producing at locations further out at sea. Due to the offshore location, the distance between fish farms is larger, thereby minimizing the spread of lice and disease. Havfarm 1 will be a benchmark for future offshore fish farming, while the structural design can also be used for other applications.

Keywords – Aquaculture, Very-Large-Floating-Structures, steel, fatigue

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Emiel Mobron is a Dutch born naval architect working and living in Norway. After finishing his Master’s at Delft University of Technology he started his career as naval architect in the superyacht industry. He has been involved in the design and engineering of different types of floating structures and now focusses on hydrodynamics and structural design of large offshore projects for 7Waves.

Parametric model for generation and analysis of modular, freeform floating island networks, constructed using flexibly formed Buoycrete

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