Adriatic LNG Terminal

Is one of the most significant offshore energy infrastructures developed in Europe for the reception, storage and regasification of liquefied natural gas (LNG). Developed through a strategic partnership between Qatar Petroleum, ExxonMobil and Edison, the terminal was designed to enhance the security of energy supply to northern Italy through a Gravity-Based Structure (GBS) constructed onshore and subsequently towed to its permanent offshore location in the Adriatic Sea. The facility has an annual regasification capacity of approximately 8 billion m³ of natural gas and incorporates two LNG storage tanks with a combined capacity of 250,000 m³

From a structural engineering perspective, the platform measures approximately 188 m in length, 88 m in width and 47 m in height, comprising a post-tensioned foundation slab, double-hull perimeter walls, an intermediate deck supporting the cryogenic storage tanks and a top deck carrying the regasification process facilities. The reinforced concrete structure was designed not only to withstand permanent and operational loads but also to resist the demanding marine conditions associated with flotation, towing, installation and long-term offshore operation

ERSIGROUP, through its subsidiary Armasur, participated in the supply, fabrication and installation of reinforcing steel for the entire concrete structure. The scale of the project required a highly industrialized production process to manufacture and deliver 24,000 tonnes of fabricated reinforcing steel, distributed throughout the foundation slab, double-hull walls, intermediate deck supporting the LNG tanks and upper structural walls. The 15,800 m² post-tensioned foundation slab alone incorporated approximately 4,000 tonnes of reinforcing steel, while the lower walls contained 7,000 tonnes and the upper walls a further 7,500 tonnes. These elements were constructed using slip-form construction techniques, achieving climbing rates of up to 1.2 metres per shift

The repetitive nature of the structural components enabled the implementation of advanced reinforcement prefabrication, optimization and logistics processes, maximizing manufacturing efficiency and ensuring a continuous supply of reinforcement to the construction site. The close integration of detailed engineering, industrial fabrication and logistics planning proved essential for maintaining the demanding construction schedule of this technically complex offshore infrastructure while ensuring the highest standards of quality, traceability and construction safety

The combination of detailed engineering, industrialized reinforcing steel fabrication and advanced construction techniques consolidated ERSIGROUP‘s participation in one of the largest concrete gravity-based structures ever developed for the energy sector, demonstrating the company’s capability to deliver large-scale reinforcing steel solutions for technically demanding international offshore projects

KEY MILESTONES

• Offshore Liquefied Natural Gas (LNG) Terminal based on a Gravity-Based Structure (GBS)
• Platform measuring approximately 188 m in length, 88 m in width and 47 m in height
• LNG storage capacity of 250,000 m³ provided by two cryogenic storage tanks
• Annual regasification capacity of approximately 8 billion m³ of natural gas
• 24,000 tonnes of fabricated and installed reinforcing steel
• 15,800 m² post-tensioned foundation slab incorporating approximately 4,000 tonnes of reinforcing steel
• Lower double-hull walls containing 7,000 tonnes of reinforcing steel
• Upper structural walls, approximately 33 m high, incorporating 7,500 tonnes of reinforcing steel
• Construction using slip-form technology, achieving climbing rates of up to 1.2 m per shift
• Installation of 40 precast concrete beams with spans of approximately 35 m supporting the upper deck
• Implementation of industrialized reinforcing steel fabrication, prefabrication and installation processes developed by RSIGROUP, optimizing productivity, quality, safety and full traceability on one of Europe’s largest offshore energy infrastructure projects