Mammoet breaks Vietnamese heavy-lift record
Mammoet was selected by the Vietnam-based PTSC Mechanical & Construction Company to complete a four-phase project for the offshore Sao Vang and Dai Nguyet (SVDN) gas and condensate development project, about 300 kilometres south-east of Ho Chi Minh City, Vietnam.
The SVDN field development project was approved by the Vietnamese government in 2017 and will produce up to over 1.5 billion cubic metres of gas and over 0.5 million barrels of condensate annually. Mammoet’s scope included load out of the Sao Vang jacket, flare tip installation, installation of the living quarter’s module and topsides integration with a deck support frame. The project was completed without incidents, despite the coronavirus outbreak adding further complexity to this project due to travel restrictions.
12,733-tonne jacket load-out
The project’s first phase involved the load-out of the 12,733-tonne jacket. Due to its dimensions of 131 metres, by 81.7 metres, by 56 metres, Mammoet utilised a strand jack load-out system, and the jacket was built with a launching truss on skid beams, with breakout jacks used to initiate movement of the jacket from its assembly position. Then, strand jacks and winches began the main pulling operation. The jacket was then loaded on a barge.
The topside’s 100-metre high vertical flare stack needed to be fitted with its flare tip, which was done by Mammoet’s Conbit team with a tailor-made gantry system whilst the deck was still onshore.
Mega Jack 5200
The living quarter (LG) module was transported via 56 axle lines of Self-Propelled Modular Transporters (SPMT) to the topside area, where four Mega Jack 5200 towers placed the LQ on top of the Mega Jack 5200 system for lifting to a height of 18.6 metres. Next, the LQ module was skidded into its final location on the deck on beams.
The Mega Jack system was later repositioned underneath the 14,000-tonne Main Deck to jack up to a height of 18m. After which, the Deck Support Frame was skidded beneath the topside, which was then lowered and integrated with the Deck Support Frame. Mammoet was able to efficiently load out the entire topside structure, by this point weighing 15,608 tonnes, using the same strand jack equipment that had been employed for the earlier jacket load-out.