shtokman lng plant and terminal structural steel on 12 november during metal expo exhibition 2009,...

Presented on 12 November during Metal Expo exhibition 2009, Moscow

Shtokman LNG plant and terminal

Structural Steel


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


Typical Module Skeleton Overview


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


Typical Interconnecting Module Structure


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)


Pipe racks

Shelters

One 170m height Main Flare (800metric tons structure)

Marine facilities

Various skids and packages

Stick Built Structures

Other Structures

Miscellaneous Structures


LNG Train Pipe Rack Overview (Stick-Built)


Typical Process Pipe Rack Overview (Stick-Built)


Typical Shelter + Stick Built Structure


Typical Shelter Overview (Stick Built)


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


Material selection Temperatures: Statically, few days below -20°C during the year Annual Lowest Mean Daily: -26.5°C 10 Year Return Period Lowest Temperature: -33.1°C 100 Year Return Period Lowest Temperature: -39.0°C

Modules are mostly designed by pre service phases such as sea-transportation and load-outs (i.e. with T°statistically > -20°C) Stick-Built Structures will have to withstand design loads combined

with design temperature: E.g.: -26.5°C 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



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 > -30°C)



Structural steel Material – “Russian” Standards

Structural steel Material – “International” Standards


Structural steel Section – “Russian” Standards

Structural steel Section – “International” Standards


Example of equivalence tables between Russian and International standards

shtokman lng plant and terminal structural steel on 12 november during metal expo exhibition 2009,...

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