adriatic lng terminal (alt) - iv - ntnu

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Adriatic LNG Terminal (ALT)

Roger D. LeickALT Topsides Manager

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ALT Functional Requirements• Offshore LNG storage and re-gas terminal under development by

affiliates of ExxonMobil, Qatar Petroleum, and Edison for installation in Northern Adriatic, 17 km east of Porto Levante, Italy

• Designed to deliver annual average of 8.0 billion standard cubicmeters of gas

• 80% of terminal capacity reserved for supply of LNG from Qatar’sNorth Field by Ras Laffan Liquefied Natural Gas Company Ltd. (II)

• Can berth LNG carriers ranging in size from 65,000 to 152,000 m3

• LNG offloading via three innovative loading arms and one vapor return arm with enhanced operability in exposed conditions

• Two LNG storage tanks with total working capacity of 250,000 m3

• 30-in diameter, 40-km long gas pipeline to onshore metering station

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ALT -- An Industry “First”

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ALT Project Commitment to HSE

• Deliver a safe, reliable, and operable facility at minimum cost through simple and effective design

• Comply with all locally applicable laws and regulations, and responsible standards in the absence of applicable regulations

• Personnel safety is a core value of the Project• All accidents are preventable

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Environmental Design Criteria

• Metocean criteria (wind and waves) based on calibrated North Adriatic hindcast which includes 20 continuous years of data plus 34 storms spanning 36 years

• Geotechnical criteria based on site-specific soil investigation utilizing Piezo Cone Penetrometer Tests (PCPT) and soil borings

• Seismic hazards based on a probabilistic seismic hazard assessment (PSHA) by D’Appolonia and a two-tier design approach (Operating Basis Earthquake (OBE) and Safe Shutdown Earthquake (SSE))

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Campamento Casting Basin at Algeciras

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Preparation of Casting Basin

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Mooring and Berthing System

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Modular LNG Storage Tanks• Self-standing, prismatic tank utilizing internal truss

system => constructed entirely of 9% nickel steel• Geometry conducive to panel line fabrication and

automated welding => more efficient and tightly controlled fabrication process

• Designed not to leak during life of terminal => rigorous fracture mechanics design and extensive non-destructive test inspection

• Secondary containment system sized to contain any credible leak => provides extra measure of safety

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Schematic of Modular LNG Tank

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Secondary Containment System

100mm Screed

3 x 150mm THK Cellular Glass Insulation

AERATED CONCRETE

50 mm Screed

5mm THK 9% Ni

100mm Reinforced Screed TANK OUTER SKIN

GBS TANK FLOOR

GBS INNER WALL

3mm CARBON STEEL VAPOUR BARRIER

2 x 75mm Cellular Glass

5mm THK 9% Ni

Expanded Perlite

Vapour Barrier

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Unique LNG Offloading Arms• Exposed location offshore requires specially adapted

offloading arms to accommodate wave induced motions• Conventional loading arms not well suited to this

application because:– Conventional cryogenic swivels more prone to wear-out

prematurely under expected range of motions– Connecting the arm(s) to a moving manifold on the LNG carrier

is more difficult and could damage flange sealing face

• FMC Technologies developed “Cable Targeting System” (CTS) to increase allowable range of motions (by up to factor of 4)

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Test of Prototype Loading Arm

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ALT Topsides Layout

Maintenance Building

Living Quarters

Electrical & Instrument

Building (EIB)

Power Generation & Heat Recovery

Open Rack Vaporizers (ORV)

& HP Sendout Pumps

Boil-off Gas Compressors

Loading Platform w/ Loading Arms

Concrete / GBS Mooring Dolphins

Berthing Structures

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ALT Pipeline System

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Summary• ALT Terminal will represent an industry “first” and set a

standard for future such terminals • Safety, reliability, operability, and cost effectiveness of

the ALT Terminal has been enhanced by the:– Marriage of conventional technology (concrete GBS and LNG re-

gas facilities) – Logical extension of existing technology (LNG offloading arms

equipped with cable targeting system) – Judicious integration of new technology (Modular LNG tanks)

• ALT Project is committed to HSE => all accidents are preventable