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INSTALLATION OF TOPSIDE USING FLOATOVER METHOD

INSTALLATION OF TOPSIDE USING FLOATOVER METHOD. Kuliah Tamu Fakultas Teknologi Kelautan - ITS 2 November 2010 By. Ir. Ice Achmad Kurniawan. 1. Agenda. Why Floatover Floatover Concept Design Engineering Barge Equipment and Appurtenances Floatover Sequences 6. Procurement

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INSTALLATION OF TOPSIDE USING FLOATOVER METHOD

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  1. INSTALLATION OF TOPSIDE USING FLOATOVER METHOD Kuliah Tamu Fakultas Teknologi Kelautan - ITS 2 November 2010 By. Ir. Ice Achmad Kurniawan 1

  2. Agenda • Why Floatover • Floatover Concept • Design Engineering • Barge Equipment and Appurtenances • Floatover Sequences • 6. Procurement • 7. Marine Spread 2

  3. 1. WHY FLOATOVER • Conventional method: LIFTING • WHY FLOATOVER • Unavailability of suitable vessel with crane capability to install heavy topside (>2000MT) • Cost and schedule advantages of installing pre-commissioned, integrated, single-piece topsides. • Desire to reduce increasingly expensive offshore hook-up and commissioning time • Now more demanding due to Scarce availability of heavy-lift crane vessels for work in shallow waters 3

  4. 2. FLOATOVER CONCEPT • The topside module typically is placed on a barge or • heavy transport vessel positioned within (internal slot • of jacket) or around the legs (external) of a • pre-installed jacket • The module then is settled onto the jacket legs by a • combination of vessel ballasting and a mechanical • lowering system. • The operation of incrementally transferring the module • loads from the barge to the jacket (MATING • operation) • Undocking, sufficient clearance, vessel move out from • the jacket 4

  5. 3. FLOATOVER T&I DESIGN ENGINEERING 1. Deck Mating analysis 2. Barge Strength Check (load out & transportation condition) 3. Transportation Analysis 4. Mooring Analysis 5. Seafastening Design 6. Floatover Rapid Ballast System Design 7. Jacket Structural Analysis (allowable limit during floatover) 5

  6. PROCESS DESIGN FLOW DIAGRAM 6

  7. MATING ANALYSIS • To simulate the barge’s motion characteristic and to identify the loading on the jacket using a time domain analysis. • Multiple load cases were identified from the initial stage, docking, load transfer and undocking stage to represent the floatover method • The load impact result shall be within allowable jacket design load • Installation sea states criteria shall be established at up front stage as an input for the analysis. • Software use MOSES or LIFSIM • Seastate Input (Installation Criteria) • Head/stern sea Hs = 1.00 m Tz up to 7.5 s • Quartering sea Hs = 0.75 m Tz up to 7.5 s • Beam sea Hs = 0.50 m Tz up to 7.5 s • Output will be used to determine the flaotover workability 7

  8. DSF-BARGE SEAFASTENING 8

  9. TOPSIDE-DSF SEAFASTENING 9

  10. LMU 10

  11. DSU 11

  12. PLAN LAYOUT LOAD OUT 12

  13. LAY OUT FENDERING SYSTEM 13

  14. JACKET ALLOWABLE IMPACT LOAD 14

  15. 4. FLOATOVER OPT.SEQUENCES • Standby - The vessel is a safe distance from the substructure but connected to the mooring system, preparation rapid ballast system or the hydraulic jacks are under way • Docking - The vessel enters the substructure and alignment • Pre-Mating - When ballasting the vessel to match the leg mating units (LMU) with receptors on top of the substructure legs and removing the remaining tie downs, it is critical that the vessel motions be limited to suit the chosen LMU geometry. No weight transfer yet occurs • Mating - The topsides is lowered onto the substructure by either rapid ballasting of the vessel or by contracting the hydraulic jacks. The topsides weight is transferred to the jacket completely • Post-mating - A gap is created between the deck support units (DSU) and the vessel to ensure vessel motions will not cause contact between the two • Exit - The vessel is removed from the jacket slot. • Post Floatover • - Removal of premooring system, clean up installation aids from jacket if required • - Process of welding & NDT examination between topside leg with jacket transition pieces • - Final Survey 15

  16. ANCHOR PATTERN 16

  17. ELEVATION 17

  18. 5. BARGE SYSTEM AND APPURTUNANCES • Rapid Ballast System: to perform the load transfer in the available 12-hour tidal sequence, with specific rate. Can be external or internal (modified from existing barge ballast system) • Fendering system was designed to ease the transition through the jacket with sufficient clearances, which reduced the sway impact loading upon docking. • The surge fenders were installed to lock the barge in its final docking position. • LMU (elastomer-based leg mating unit): to reduce the vertical impact forces (designed to support 50%) of the deck load during load transfer. • DSU (Deck Support Unit), elastomer to reduce vertical impact between DSF and topside during the deck load transfer • DSF (Deck Support Frame), structure to support topside during load out, transportation and floatover • Barge Motion Monitoring System, electronic system to monitor motion of the barge (6 degree of freedom, the motion will be compared with mating analysis) • Positioning System • Wave Rider Buoys 18

  19. BARGE GENERAL LAYOUT 19

  20. 6. PROCUREMENTS • S45 PREPARATION AND FENDERING SYSTEM • LINKBEAMs & LIGHT SKIDBEAMs FABRICATION • 3RD PARTY MARINE SPREADS CHARTER (Various) • 4. EXTERNAL RAPID BALLAST SYSTEM • 5. SURVEY AND POSITIONING • 6. WEATHER FORECAST • 7. CATERING SERVICE • 8. INSTALLATION AIDS • 9. VSAT LINK SERVICE • 10. AGENCY SERVICE • 11.ROV • 13. NDT

  21. 7. MARINE SPREAD • 1 X TRANSPORTATION BARGE (S45) • 1 X TOWING TUG 14,200BHP • 2 X AHT 10,800BHP C/W KARMFORKS • 1 X AHT 7000BHP • 1 X AWB (Accommodation Work Barge), 120PAX CAPACITY, 120T CRANE • 1 X CREW BOAT, 80 PAX CAPACITY • 1 X ZODIAC BOAT

  22. 1.Project Description CPP Topside The NBCPP topside is a large, complex integrated deck with a not to exceed weight of 14,000 MT. The field is located approximately 60km east-north-east of the Belanak FPSO installed in the Belanak Field, located on the Block B of the Indonesian sector of the Natuna Field.

  23. 2.Project Phases Installation of CPP Topside using Floatover method on CPP Jacket Load out of CPP Topside on S45 Transportation of CPP Topside Sailaway Location: S45 mobilize to Topside Fabrication Yard Location: Block B of Natuna Sea – Indonesia The NBCPP is located in 95.2 m water depth

  24. 3. Scope of Work • Main Scope of Work: • Provision of expertise, manpower, plant, equipment, Contractor’s Spread, • consumables and all other items necessary to transport CPP Topside • components from the fabrication yard to the North Belut offshore Site • and install them safely and efficiently.

  25. 4.Project Key Milestones

  26. 5.Interfaces with Other Company’s Contractor

  27. Project Photos LOAD OUT

  28. Project Photos TOWING

  29. Project Photos PRE-MATING

  30. Project Photos FLOATOVER

  31. Project Photos FLOATOVER

  32. Project Photos FLOATOVER

  33. Project Photos FLOATOVER

  34. Project Photos FLOATOVER

  35. Project Photos FLOATOVER

  36. Project Photos FLOATOVER

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