Heerema Marine Contractors (HMC) has received a DNV GL technology qualification certificate for its QUAD lifting method, which has been established to install and/or remove oversized topsides or jackets.
HMC tested the lifting method in the Gulf of Mexico in October 2018. The solution deploys two dynamically positioned vessels and uses the combined capacity of the ships' four cranes in tandem. HMC’s semi-submersible crane vessels Thialf and Balder were used to compete the test.
The QUAD lifting method is, according to HMC, suitable for installing topsides on any type of foundation, from jackets to floating structures. HMC added that the method guarantees lower overall project costs.
The certificate from DNV GL recognises that HMC is able to prepare and execute this method.
According to HMC, when its largest semi-submersible crane vessel Sleipnir enters commercial service, the company will be able to use the combined lifting capacity of Thialf’s 14,000-tonne capacity cranes and Sleipnir’s 20,000-tonne capacity.