HEEREMA MARINE Contractors has developed and proven a pioneering installation technique for giant platforms. QUAD Lift, which is equally applicable to decommissioning, involves parallel deployment of two of the company's semisubmers-ible crane vessels to speed up installation/mating at the field location. Thialf and Heerema's new flagship vessel Sleipnir will jointly provide the capability through their four cranes to quickly install integrated decks weighing up to 30,000 metric tons (29,762 tons), via their respective 14,000 and 20,000-metric ton (15,432 and 22,046-ton) lifting capacity.
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