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. T&I DESIGN ENGINEERING
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 DIAGRAM6

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 SEAFASTENING8

9. TOPSIDE-DSF SEAFASTENING9

10. LMU 10

11. DSU 11

12. PLAN LAYOUT LOAD OUT 12

13. LAY OUT FENDERING SYSTEM13

14. JACKET ALLOWABLE IMPACT LOAD14

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. Topside using Floatover method
2.Project Phases
Load out of CPP
Topside on S45
Transportation of CPP
Topside
Sailaway
Installation of CPP
Topside using Floatover method
on CPP Jacket
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
Date
Activity
11 June 2007
Contract Effective Date
3 Jan 2009
S45 transfer to Sintai for Fendering System and Preparation Work
1 May 2009
S45 mobilized to PTMI Yard
16 May 2009
CPP Topside loaded out onto S45 barge
1st June 2009
Sailaway of CPP Topside
6th June 2009
CPP Topside Installed using Floatover method
7th June 2009
All vessels demobilized from site

26. 5.Interfaces with Other Company’s ContractorNo
Description
PT Technip
PT Mc Dermot
PT Saipem 1
All loadout planning, engineering and AFC dwg R X
Review + supply barge data, check barge strength and stability for load out 2
Load out operation 3
Structural Load out Analysis (Reaction load) 4
Transportaton Analysis 5
Mating Analysis 6
Installation Aids fixed by welding to jacket structures
Supply material, Fabricate and pre install
Design and supply AFC dwg and MTO 7
DSF
Design
Supply material, Fabricate 8
CPP Topside 9
LMU (OKI)
Design, Fabricate
Install 10
Seafastening
Supply material, Fabricate and install 11
External Rapid Ballast System Floatover
R, may request to use assistance
Design and install
R = Review
X = Responsibility

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