A boom telescopic mobile crane from Liebherr was used during the recent fabrication of the Seajack ‘Leviathan’ in the UAE, to lift and place the top two segments on each of the ‘leviathan’s’ four legs; speeding erection times.

Lamprell, a specialist services provider to the oil and gas industry, opted to rent the region’s first Liebherr LTM11200-9.1 telescopic crane from Al Faris Rental, to lift and place the top two segments of the Seajacks four legs; providing faster erection times.

The alternative option for Lamprell was to use Al Faris’s 500-tonne Liebherr’s in a tandem lift operation with both cranes being rigged on luffing jib configuration.

This was ruled out as the cranes would have had to be repositioned for each of the four legs; taking more time to complete the job.

The four legs, each totalling a height of 86.46 metres, incorporate eight segments. For the 7th and 8th segments, each weighing 52 tonnes, the Liebherr crane was positioned alongside the Seajack to provide a 26 metre radius and capitalise on the cranes telescopic boom – capable of reaching up to 100 metres – to ensure fast lifts and speedier erection times for each of the legs.

The Al Faris Rental crane was configured with 202 tonne counterweights and an 88.30-metre boom length with superlift and an 18-metre hydraulic offset fly jib to complete all four legs.

Additionally, in a twin lift with a Liebherr LTM1500-8.1 500-tonne capacity mobile crane, the cranes were used to lift and position a  Huisman marine crane at the stern of the seajack for permanent installation.

The LTM11200 was configured with a 53.3-metre boom and superlift and the LTM1500 with a 31.7-metre boom to lift the 138-tonne Heisman in a ‘top and tail’ operation.

The Seajack ‘Leviathan’ is a self propelled, self elevating lift boat intended for harsh environment conditions and was commissioned to install wind turbines in the North Sea.

Equipped with the latest Class 2 dynamic positioning technology the vessel is fitted with high standard accommodation for up to 90 people. – TradeArabia News Service