Mammoet in 14,273 tonne Jangkrik load out

International heavy lift and transport specialist Mammoet said it set a new standard in modular construction with its installation of an integrated topside module (ITM) weighing more than 14,000 tonnes.

Installation of the module in one piece for the Jangkrik floating production unit (FPU) in Karimun Island, Indonesia, was an industry first and a significant timesaver for FPU construction, Mammoet said. It reduced integration time and was safer, the Dutch company continued.

The Jangkrik FPU is part of Jangkrik Complex Project, operated by ENI Muara Bakau B.V. as contractor to SKK Migas, the Indonesian upstream oil and gas agency. ENI holds a 55 % interest in the project, Mammoet said. Other partners are ENGIE (33.3 %) and PT Saka Energi Muara Bakau (11.7%). An engineering procurement, construction and installation contract for the project was awarded to a consortium led by Saipem which includes Hyundai Heavy Industries, Tripatra Engineers & Constructors and Chiyoda. The ITM was fabricated by Saipem in the Karimun Island yard while HHI built the hull in Ulsan, South Korea.

Mammoet installed an hydraulic skidding system with built-in vertical jacks underneath the topside. The jacks were used to lift the topside off its temporary supports and then to weigh it. Still on the jacks, the topside was skidded over nine skid beams from its construction area to the quayside to be prepared for load out.

As the load out progressed a computerised ballast system with a capacity of 56,000 cubic metres an hour was used to compensate for tidal differences and the weight of the topside as it was loaded. At the same time the jacks compensated for deflections of the ITM and the skid beams.

Mammoet said it has entered a new era where even bigger modules can be loaded onto floating hulls where the overall construction schedule is shortened by months.