January 3 - Mammoet has completed the load-out of the 14,273-tonne integrated topside module (ITM) for the Jangkrik floating production unit (FPU) in Karimun Island, Indonesia.
Mammoet explained that normally the topside of an FPU is constructed with multiple modules placed individually and integrated on the hull of the vessel. In this project the topside was fabricated and commissioned in one piece on shore, and moved in its entirety onto the hull. Mammoet claimed that this drastically reduced integration time and improved safety.
For this project, Mammoet deployed a hydraulic skidding system with built-in vertical jacks and installed it underneath the topside. The vertical jacks lifted the topside off its temporary supports, enabling Mammoet to calibrate the weight. Supported by the jacks, the topside was skidded over nine skid beams from its construction area to the quayside to prepare for load-out.
Mammoet's computerised ballast system, with a total capacity of 56,000 cu m/hr, compensated for tidal differences and the weight of the topside. This kept the hull level with the quayside during the load-out, while the vertical jacks compensated for any deflections of the ITM and the skid beams.
Mammoet claimed it has created a new technique in which even bigger modules can be loaded onto floating hulls. Topsides can be fabricated and commissioned almost fully on land while hull construction is ongoing. This approach, according to Mammoet, reduces integration activities to a minimum and significantly shortens the overall construction schedule.
Jangkrik FPU is a part of Jangkrik Complex Project, operated by Eni as contractor to SKK Migas - the Indonesian upstream oil and gas agency. Eni holds a 55 percent interest in the project. Other Jangkrik partners are Engie (33.3 percent) and Saka Energi Muara Bakau (11.7 percent).
An engineering, procurement, construction and installation (EPCI) 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 at its Indonesian yard in Karimun Island while HHI built the hull in Ulsan, South Korea.