Overview of Offshore Offsh ore Stru Struct ctural ural Engin ng ine eering ri ng for fo r Proje Proj ect Management nagement
16 August 2011
TA B L E OF CONTEN CONTENTS TS 1. INTRODUCTION 2. PLAT PL ATFORM FORM TYPES 3. FIELD LAYOUT 4. PLATFORM TERMINOLOGY 5. FIXED OFFSHORE PLATFORM DESIGN 6. INFORMATION INFORMATION FLOW FL OW
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1. INTRODUCTION Proposed : To support Oil & Gas facilities, i.e., Production, Export of Liquid and Gas, Drilling and Living Quarter.
1. INTRODUCTION Onshore & offshore
Liquefaction Reinjection compressors
Onshore Oil & Gas Field Facilit ies
GTL
Methane (C1)
Asso ci ated Gas & Non Associ ated Gas
Regional consumers -Power plant -Fuel gas
Gas Processi ng Plant
Steam cracker (Ethylene)
Ethane (C2)
C3/C4 C5-12
Offshor e Oil & Gas Field Facilit ies
C5-20 CO2
Sulphur
Water
Petrochemicals - Methanol - Ammonia - Hydrogen…
LPG Gasoline Condensate
2. PLATFORM TYPES Fixed Platform Floating Platform Subsea
3. FIELD LAYOUT Fixed Platform Field Layout (Sample)
3. FIELD LAYOUT
3. FIELD LAYOUT Floating Platform Field Layout (Sample)
3. FIELD LAYOUT
4. TERMINOLOGY
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4. TERMINOLOGY Jacket / Sub-structure Leg Horizontal framing Conductor framing Can Knee braces Sea deck walkway Conductors Curved Straight Piles Through leg Pile cluster / Skirt Pile Batter v/s straight Grouted v/s ungrouted
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4. TERMINOLOGY Miscellaneous and Appurtenances Risers and clamp Caissons / casings Boatlanding Barge bumper / fender J-tube Flooding / grouting tube Launch cradle Mudmat Anodes
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5. FIXED OFFSHORE PLATFORM DESIGN Code and Standard Weight Control Structural Analysis and Design Structural Software
Code and Standard Structural Design must comply with the following Code and Standard : International Code and Standard American Petroleum Institute (API), International Standard Organization (ISO), American Institute of Steel Construction(AISC), American Welding Society (AWS)
Local Government Regulation Department of Mineral Fuels,
(กรมเช อเพลงธรรมชาต, กระทรวงพลังงาน)
Owner Specification Chevron (CES), PTTEP (TOTAL and Arthit), etc.
Classification Body Specification , if required American Bureau of Shipping (ABS), Det Norske Veritas (DNV), Lloyds Register of Shipping, Bureau Veritas (BV), Germanisher Lloyds
Warranty Surveyor Specification (Insurance Company for Temporary Phase) 1
Weight Control Purpose : For monitoring the weight and centre of gravity (C.O.G) of all component parts of a platform Platfrom weight and Center of Gravity (CoG) is Critical for:
Fabrication and Ladout Capacity of support foundation during fabrication Loadout reaction to confirm loadout equipment and skid beams
Offshore Installation Capacity of sea transportation and offshore lifting barge/vessel
Platform Operating Condition Benchmark of platform weight and CoG for structural integrity check
Estimation of Weight and CoG is usually confirmed through “Weighting” before Loadout
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Weight Control Contingency and Tolerances : Expressed in terms of a percentage of Base Weight are to allow for weight changes due to the uncertainty of the data, lack of design or final selected vendor data. Sample of Conting ency and Tolerances Percentage
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Weight Control Respon sibi lities :
Lead Structural Engineer Assign weight control engineer on the project Interface, co-ordinate and collect weight data from discipline
Weight Control Engineer Responsible for recording and compiling the weight and centre of gravity information from all disciplines for generating the weight report
Lead Discipline Engineer Responsible for providing all the necessary information including the weight and COG information of items associated with their disciplines Updating weight and CoG information
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Structural Analysis and Design Design Loading : Dead Loads (Gravity) - Self weight (Computer generated) - Miscellaneous Dead Weight (Hand-Coded) - Equipment, Piping, Instrument and Electrical Dead Weight - Internal Flood water - Buoyancy
Live Loads (Movable or Changeable) - Content in Vessels, Equipments and Piping - Storage - Personnel - Crane Lifting weight - Helicopter - Tender Assisted Drilling Rig - Well Servicing Load 1
Open Area Live Load
Structural Analysis and Design Design Loading : Operating and Storm Condition Environmental Loads - Water Depth and Tidal Variation - Wave -Current, i.e., Wind Generated and Tidal - Wind - Additional Wave Load -
On appurtenance item, i.e. anode
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Marine Growth
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Wave slamming
- Snow/Ice - Earthquake
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Structural Analysis and Design Design Loading : Accident al Loads - Boat Impact - Fire - Explosion / Blast - Drop Object - Accidental Flooding
Pre-Service Loads - Motion Force - Mating Load
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Structural Analysis and Design Structural Analysis : In-service Conditions - In-place - Dynamic - Fatigue - Non-linear Pushover - Seismic
Pre-service Conditions - Loadout - Transportation - Lifting - Launch - Floating - Upending - On-bottom Stability - Pile Stick-up & Drivability 4
Structural Analysis and Design Structural Software : SACS
Global Response determined from Finite Element Analysis - Usually sufficient with 2-noded beam element
Computer program wil l automatically - Generate Gravity and Environmental Loads - Consider non-linear pile-soil interaction - Perform topside and jacket member and joint code check - Calculate Pile UC and Safety of Factor
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Structural Analysis and Design Structural Softw are : USFOS Non-linear structural analysis, i.e., Pushover, Fire and Blast, Non-linear Seismic Time History
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Structural Analysis and Design Structural Software : MOSES - Barge Stability - Transportation - Floating, Launch and Upending
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Structural Analysis and Design Structural Softw are : NASTRAN - General Finite Element Analysis (FEA)
Local Analysis of Connection
FEA of Pile Cluster
Structural Software : GRLWEAP - Pile Drivability
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Structural Analysis and Design Structural Softw are : BOCAD - 3D Structural model - 2D drawings - MTO - Cutting Plan
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Structural Analysis and Design Structural Softw are : PDMS - 3D Structural model - Clash Check - Weight Take off and CoG
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6. FLOW OF INFORMATION Flow of Information during Executi on Stage Requir ed Infor mation Client Company Specifications Company Reference/Standard Drawin gs Site Enviro nment Data Geotechn ical/Soil Data
Internal Information Piping – Plot Plan / Equipment Layout Mechanical – Equipment List and weight E&I – Equipment List and weight Safety – Drop object, Fire and Bl ast study
Vendor Drawi ng Equipment Dimension and weight
l a r u t c u r t S e r o h s f f
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Deliverables Document and Report Basis of Design Project Specific ation Weight Control Report Desig n Calcu lation Report Other Document s Site Survey Report MTO BOM Drawing General Note and Standard Drawing Topsi de Drawi ngs Jacket & Pile Drawing s Demolitio n Drawings Offshore Installation Sequence Drawings 3D BOCAD mo del 3D PDMS model
Thank you
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