Ulstein designs new heavy lift vessel for OHT

Norway based Offshore Heavy Transport (OHT) is set to enter the offshore renewables and installation market with a new heavy lift transport and installation vessel. It is a customised Ulstein Alfa Lift design developed by Dutch design company Ulstein Design & Solutions in close cooperation with OHT. The first vessel (with options for another three units) will be constructed by China Merchant Heavy Industry (CMHI) and available for construction and installation activities from early 2021.

This dynamically-positioned, 48,000 DWT vessel, will have the ability to perform heavy lift crane operations with the main deck submerged. The patent-pending design combines the benefits of a semi-submersible transport vessel with a large, 3,000 mt lifting capacity main crane from Liebherr.
The length overall will be 216.30 meter. The vessel’s capabilities should match the future requirements of the offshore wind industry, allowing it to transport and install up to 10 x 1,500t ultra-large jacket foundations or 11 x 2,000t XXL monopiles plus transition pieces for the largest anticipated wind turbine generators.

Increasing operability window
’We started the development of the Ulstein Alfa Lift idea back in 2015 with the driver to increase the safety of submerged operations and at the same time increasing the operability window for subsea installations using a crane’, says Edwin van Leeuwen, managing director at Ulstein Design & Solutions.
‘When we approached Ulstein with our intended strategy to enter the offshore renewables market and the idea of adding crane capacity to a semi-submersible heavy lift transport vessel, Ulstein presented their Alfa Lift solution on the spot’, mentions Torgeir E. Ramstad, CEO at OHT. ‘That was a direct “hit”, as it allows us to enter the installation market, at the same time expanding on our capabilities in OHT’s core market.’

All the latest insights and developments on project cargo will be discussed during the Project Cargo Summit on the 12th & 13th of September in Rotterdam. For more information and the program, visit the website.

Author: Martin Dekker
Date: The 2nd of August

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