Heavy lifting specialist Mammoet has completed the load-out of the 14,273-ton integrated topside module (ITM) for the Jangkrik floating production unit (FPU) in Karimun Island, Indonesia.
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Image of Jangkrik, from Mammoet |
An engineering, procurement, construction and installation contract for the project was awarded to a consortium led by Saipem which includes Hyundai Heavy Industries (HHI), Tripatra Engineers & Constructors and Chiyoda.
The ITM was fabricated by Saipem in their Indonesian yard in Karimun Island while HHI built the hull in Ulsan, South Korea.
Normally, the topside of an FPU is constructed with multiple modules placed individually and integrated on the hull of the vessel. In this project, Mammoet said, the topside was fabricated and commissioned in one piece on shore, and moved in its entirety onto the hull. This drastically reduced integration time and improved safety.
The firm deployed a hydraulic skidding system with built-in vertical jacks and installed it underneath the topside. By using the jacks, Mammoet lifted the topside off its temporary supports and performed a calibrated weighing.
While supported by the jacks, the topside was skidded over nine skid beams from its construction area to the quayside to prepare for load-out. During the load-out, Mammoet’s computerized ballast system, with a total capacity of 56,000m3/hour, compensated for tidal differences and the weight of the topside and kept the hull perfectly level with the quayside.
Topsides can be fabricated and commissioned almost fully on land while hull construction is ongoing. This approach reduced integration activities to a minimum, and significantly shortened the overall construction schedule by months, Mammoet said.
The Jangkrik FPU is part of the Jangkrik complex project, operated by Eni Muara Bakau as contractor to SKK Migas. Eni has 55% interest in the project while partners Engie and PT. Saka Energi Muara Bakau hold 33.3% and 11.7%, respectively.
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