2. Offshore Structure1 External

7/25/2019 2. Offshore Structure1 External

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Offshore Structure

KOMUNITAS MIGAS INDONESIA

Platform and Subsea Structure


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Offshore Structure


Platform and Subsea structureDesign Study


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Types of Offshore Platforms

Fixed Platformmost common

Minimum Structuresfree standing caisson

Gravity Based Platformconcrete

Guyed Towerguylines for lateral support

Tension Leg Platform - Hutton, Jolliet, Heidrun, Magnolia

Spar

Hybrid TLP - Devil

s Tower Compliant TowerAmarada HessBald Pate


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Deepwater ConceptsDeepwater ConceptsMedium/Shallow

Water - to 400


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Jack-up Processing Platform

4750 temaximum

operating

weight

80*38*6.5m

deck

3mbuoyancy

box

6m skirt


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ConventionalPlatforms

CompliantTowers

Tension LegPlatforms

SPARS

SemiFPSs

TankerFPSOs

EmergingConcepts

SubseaMethods

0 1000 2000 3000 4000 5000 6000 7000

Water Depth Range (Feet)

MethodsTechnical /Commercial Range of Applicability

Matching Technology to DemandsMatching Technology to Demands


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Offshore Platform Design Codes

API RP 2A WSDRecommended Practice for Planning, Design and ConstructingFixed Offshore Platforms - Working strength Design (WSD)

AISCAmerican Institute of Steel Construction

AWS D1.1Structural Welding Code Steel

Company Specifications

Government Regulations


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Operational Considerations

FunctionWellhead, Production, LQ, Combination

LocationDesign Wave, Current, Earthquake, etc

OrientationPrevailing Seas, Winds, Currents

Water DepthPlus Tide Fluctuations

Deck ElevationsAir Gap, Equipment Heights

Deck Area LayoutEquipment Locations, Landing Areas


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Environmental Considerations

Normal Conditions 1 year ; 10 year

Extreme Conditions 100 year

Earthquake Seismic Exposure

Wind, Wave and Tides

Currents

Marine Growth

Scour Seabed Erosion

Extreme Conditions Mud Slide, Floating Ice

Site Investigations Geotechnical and Geophysical


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Wellhead Platform Contents of:

Topside Structure

Jacket Structure


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Jacket Design

In-Place Analysis

Dynamic Analysis

Fatigue analysis

Construction Conditions analysis

Load-Out Analysis

Lift Analysis

Transportation and Barge Stability analysis

Floatation/Upending Analysis

On-Bottom Stability analysis & Mudmat Design

Piling Design

Miscellaneous Analysis and Design Check


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Jacket Design Loads

Dead Loads Environmental Loads

Risers, Casings, Conductors and Appurtenances

Vessel Impact Loads

Installations Loads


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Topsides Design

In-Place Analysis

Design for Construction Condition

Load-Out Analysis

Transportation Analysis

Lifting Analysis

Heliport Design

Crane pedestal Design

Fatigue

Dynamic Analysis


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Topside Design Load

Dead Loads

Live Loads

Uniform Area Live Loads

Environmental Loads

Wave Loads on Members

in The Air Gap

Drilling Loads

Equipment Loads

Earthquake Loads

Test Loads


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Offshore Structure


Platform and Subsea Structure Fabrication


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Jacket Fabrication Sequence

Stage 1

Stage 2

Stage 3

Stage 4


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Deck Fabrication Sequence (1)

DECK STACKINGDECK STACKING

Fabricate Deck Leg and Braces Below Cellar DeckFabricate Deck Leg and Braces Below Cellar Deck

Off h S


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Deck Fabrication Sequence (2)DECK STACKINGDECK STACKING

Stab CellarStab CellarDeckDeck

Install Deck PlatingInstall Deck Plating

Install Cellar DeckInstall Cellar DeckEquipmentEquipment

Fabricate Deck Leg and BracesFabricate Deck Leg and Bracesabove Cellar Deckabove Cellar Deck

Off h S


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Stab Main Deck FramingStab Main Deck Framing Install Deck PlatingInstall Deck Plating

Install Main Deck EquipmentInstall Main Deck Equipment Install Deck Leg and BracesInstall Deck Leg and Bracesabove Main Deckabove Main Deck

Off h S


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Offshore Structure



Stab Drilling DeckStab Drilling DeckFramingFraming

Install Drilling DeckInstall Drilling Deck

Plating andPlating and

EquipmentEquipment

Off h St t


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Deck Fabrication Sequence (5)

Deck with Piping andDeck with Piping and

EquipmentEquipment

Deck with Piping andDeck with Piping and

EquipmentEquipment

Off h St t


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Offshore Structure


Lifting Equipment:

Two 544MT Liebherr

LR1600 cranes

22 crawler cranes

18 hydraulic cranes Overhead cranes in

prefab shops

One tower crane

Off h St t


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Jebel Ali

Middle East

Batam Island

South East Asia

Morgan CityGulf of Mexico

Harbor IslandGulf of Mexico

Baku

Caspian

Lagos

West Africa

VeracruzGulf of Mexico

Off h St t


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Offshore Structure


Yard Size: 241 acresComponent Prefab: Fully equipped coveredbuildings for pre-assembly of large decks anddeck components

Reinforced Bulkhead:

Length: North yard: 131ft

South yard: 2 x bulkheads 600fteach

Work Load Capacity: No limitation for

fabrication of any size moduleCertification: ISO 9001

Minimum Channel Depth to Open Sea:27.8ft

Distance to the Open Sea: 0 milesSOUTH EAST ASIA

Largest jacket: 17,063MT to date

Largest single deck: 4,092MT to date

Largest complex: 11,026MT to date

Largest spar hull: 10,886MT to date

Largest onshore plant: 17,500MT todate

McDermott Batam Fabrication Yard

Offshore Str ct re


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Offshore Installation

Offshore Structure


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DB 60 DB30 KP1

Derrick Barge 27 420 x 128 x 28 S-Lay (72 OD) 2,400

Derrick Barge KP1 456 x 99 x 30 S-Lay (60 OD) 600

Derrick Barge 26 400 x 106 x 28.5 S-Lay (40 OD) 900

Derrick Barge 30 420 x 158 x 28 S-Lay (72 OD) 3,090

Derrick Barge 60 607x115x50 S-Lay (72 OD) 2,000

Installation Size Pipelay Lift CapacityVessel (LxWxD)ft Capabilities (Short Tons)

DB26

DB27

DB26

Offshore Structure


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Derrick Barge 26Dimensions: 122 x 32 x 8.7(m)

Year Built: 1975

Crane Capacity:

Fixed: 900ST

Revolving: 800ST

Max. Water Depth: 457.5m

Max. Pipelay: 40 OD

Tension Capacity: 250,000lbsAccommodation: 273 men

Offshore Structure


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Offshore Structure


Derrick Barge 30Dimensions: 128 x 48 x 8.5(m)

Year Upgraded: 1999

Crane Capacity:

Fixed: 3,080 ST

Revolving: 2,300 STMax. Water Depth: 610m

Max. Pipelay: 72 OD

Tension Capacity: 300,000lbsAccommodation: 294 men

Offshore Structure


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Offshore Structure


1995: Elf - NKossa NKF, Congo Jacket

Construction of two drilling decks and a four-leg jacket for the NKossa Field. The jacket wasfabricated using the bent type assembly and the decks using a pancake deck framing

assembly. At the time the 6,834 ST jacket was the largest offshore structure to be built in the

Middle East.

*Year of completion

Offshore Structure


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Dry Transportation

Offshore Structure


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Jacket Dry Transportation

Offshore Structure


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Crane Barge

Offshore Structure


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Jacket Lifting

Offshore Structure


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Jacket Floating

Offshore Structure


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Jacket Start to Lift

Offshore Structure


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Jacket Piling

Offshore Structure


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Deck Towing

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Deck Installation on Jacket

Offshore Structure


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Offshore Commissioning

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