Onshore Metal Structures for Shtokman Project
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Transcript of Onshore Metal Structures for Shtokman Project
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Shtokman LNG plant and terminal
Structural Steel
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
On Shtokman Onshore, the following steel structures are identified:
Modules (Process, interconnecting) built in a construction yard anywhere in the world - and transported to Teriberka site
Stick-built structures (Pipe-racks, shelters), prefabricated on a construction yard and reassemble at site - preferably field bolted
Marine facilities built on site (Site welded) One 170m height Flare structure - prefabricated on a construction
yard and reassemble at site
Modularized strategy, where possible, is justified by:
Harsh environment for construction Construction window that exclude most of the winter season
Steel Structures General Presentation
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Typical Module Skeleton Overview
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Overall Sizes:
Average (each): Length= 40m, Width= 20m, Height= 30m The smallest: Length= 18m, Width= 15m, Height= 18m The biggest: Length= 50m, Width= 36m, Height= 32m
Dry Gross Weights (Total including structure, equipment, piping etc) :
Average (each): 4000 metric tons Lightest: 500 metric tons Heaviest: 8500 metric tons
Structure Similar to offshore structures, generally sized by the pre-service phases such as sea-transportation
Main Modules
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Typical Interconnecting Module Structure
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Overall Sizes:
Average (each): Length= 30m, Width= 12m, Height= 10m The smallest: Length= 30m, Width= 12m, Height= 8m The biggest: Length= 54m, Width= 12m, Height= 14.5m
Structural Gross Weights:
Average (each): 170 metric tons Lightest: 80metric tons Heaviest: 270 metric tons
Structure Similar to offshore structures, generally sized by the pre-service phases such as sea-transportation
Interconnecting Modules (= few km of Modularized Pipe racks)
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Pipe racks
Shelters
One 170m height Main Flare (800metric tons structure)
Marine facilities
Various skids and packages
Stick Built Structures
Other Structures
Miscellaneous Structures
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
LNG Train Pipe Rack Overview (Stick-Built)
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Typical Process Pipe Rack Overview (Stick-Built)
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Typical Shelter + Stick Built Structure
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Typical Shelter Overview (Stick Built)
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
General Philosophy: Double Compliance
At design level and for Structural engineering, double Verification is required, i.e. Compliance with:
International standards Russian Standards (in-service phase, as a minimum)
Steel selection shall fulfill the same philosophy Compliance with both regulations - especially in terms of temperature
requirements
Procurement shall be practical from all countries
Structural steel Material
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Material selection Temperatures: Statically, few days below -20C during the year
Annual Lowest Mean Daily: -26.5C 10 Year Return Period Lowest Temperature: -33.1C 100 Year Return Period Lowest Temperature: -39.0C
Modules are mostly designed by pre service phases such as sea-transportation and load-outs (i.e. with Tstatistically > -20C)
Stick-Built Structures will have to withstand design loads combined with design temperature: E.g.: -26.5C
In that respect, ECA was conducted in order to demonstrate that conventional offshore steel (e.g. KT-40) is suitable for most of the plate thicknesses envisaged, in order to limit procurement of some special "arctic quality" steel.
Target maximal thickness: 50mm
Structural steel Material
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Strategy implemented is aimed to avoid difficult sourcing for most of steel plates and sections used in structures.
Material selection Requirements:
As per SNIP II-23-81 and GOST 27772-88 Site Location: Zone II5 (Design Temperature > -30C)
Structural steel Material
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Structural steel Material Russian Standards
Structural steel Material International Standards
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Structural steel Section Russian Standards
Structural steel Section International Standards
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Example of equivalence tables between Russian and International standards
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Presented on 12 November during Metal Expo exhibition 2009, Moscow
Example of equivalence tables between Russian and International standards