floating structure.

1. FPSO FLOATING
STRUCTURES
• MUHAMAD NAZHIIM ADLI BIN AZLI (TH18049)
• DANIAL ANZALLAH BIN ROZAMAN (TH20053)
• MOHAMAD HASSAN BIN M ALI (TH18016)

2. INTRODUCTION TO FPSO
• A floating vessel that can produce crude oil and gas is known as an FPSO (floating, production, storage, and off-loading
unit). There are two pieces to it: the topside and the hull.
• The FPSO, on the other hand, cannot generate oil and gas on the oil field by itself.
• As depicted in Figure 1, several offshore production systems are required, including subsea production systems (SPS),
umbilical, flow lines and risers (UFR), mooring lines, a shuttle tanker, and an off-loading buoy.
FIGURE 1: Offshore Production
System

3. • Figure 2 depicts a typical FPSO unit architecture.
• It is split into two sections: the topside and the hull.
• The flare tower, living quarters, lay-down area, mooring fairleads, and a helicopter deck are all part of an FPSO unit.
Figure 2: Typical Layout of an FPSO
Unit

4. INTRODUCTION TO THE NIGERIA FIELD DEVELOPMENT
PROJECT
• The Nigeria field is located in Nigeria's offshore region known as OPL 246, as depicted in Figure 3.
• The Nigeria field development project is made up of several important components.
• Nigerian National Petroleum Company (NNPC), South Atlantic Petroleum, Nigerian Company (Sapetro), Brazilian Oil
Company (Petrobras), and others.
• This project is primarily comprised of the FPSO, SPS, UFR, and offshore loading terminal (OLT), as seen in Figure 1.
• The methodologies utilised to develop the detailed design and construction of the FPSO hull are being examined in
order to aid future design and construction of FPSO hulls.

5. REASON FOR CHOOSING FPSO

6. STABILITY CALCULATION
• FPSO needs an ability to return to its undisturbed position
after the removal of the external force , called as Stability.
• It is a crucial because FPSO needs to remain float on the sea
floor or remains bouyant.
• FPSO must aqquired both static and dynamic stability.

7. STABILITY CALCULATION

8. MOORING SYSTEM
• Method for solving line dynamics: lumped mass method ( divides a mooring line into small segment
• Wind and current force important mooring load.
• Wind – consider dynamic, computed using mean wind speed associated recognized wind gust spectra
and wind load coefficients
• Current – consider static, computed using case of FOIs with ship shape hulls, formula from OCIMF
publication

9. MOORING SYSTEM CALCULATION

10. FPSO STRUCTURE INSTALLATION
• An exploration and feasibility study must first be completed before the field can be developed.
• Then, based on the study's findings, the front-end engineering design (FEED) of an FPSO is initiated if the economic value
of the field development is positive, taking into consideration the circumstances of the offshore market.
• Figure 3 shows the overall procedure of the FPSO field development of this study.
Figure 3: Overall procedure of
the FPSO field development in
this study

11. • Figure 4 depicts the detailed design method for the FPSO hull and the key detailed design tasks.
• The preparation of the piping and instrumentation diagram (P&ID) for each system or facility of the hull, as
illustrated in Figure 4, is at the heart of the detailed design.
Figure 4: Detailed design
procedure for P&ID of the
hull of an FPSO unit

12. • In general, hull scantlings are designed with two factors in mind: load (demand) and strength (capability).
• Loads are useful in strength equations and calculation techniques when permissible stresses reflect a desirable
strength level.
• Figure 5 depicts the comprehensive design method of the FPSO's hull structure and appurtenance supports, as well
as the primary detailed design tasks.
• The techniques for designing the hull and appurtenance supports, as illustrated in Figure 5, may be separated into
four components, which are as follows:
Figure 5: Detailed design
procedure for the hull of
FPSO

13. The pre-design phases are the same as the P&ID approach described above.
• Specification incorporation
• FEED clarification
• Incorporation of lessons learned from previous project
Hull scantling and strength analysis
• Priority tasks in the fundamental design process from IFR to IFC include longitudinal scantling and primary hull
strength analysis.
• The following are the fundamental design processes for hull scantling and strength analysis:
- Hull key plan drawing and calculation
- Appurtenance key drawing
- Strength analysis for hull and appurtenance supports
- Fatigue assessment for hull and appurtenance supports
- Impact analysis including design brief

14. Detailed structure drawings
• Based on the hull key plan and key drawing of appurtenances, detailed structure drawings may be created.
• These designs have been divided based on the structure's characteristics and have been updated with the outfitting
system.
Block production drawings
• Based on the hull construction drawings, block production drawings may be created and divided according to the block
division plan design.
- Block division
- Detailed assembly procedures (See Figure 6)
- Block fabrication drawings
- Welding map
- Non-destructive test plan
Figure 6: Detailed block assembly procedures

15. Procedure of the hull construction of an FPSO
• Figure 7 depicts the building methods for an FPSO's hull, which include the procurement stage, the dry dock stage,
and the on-shore stage.
• Raw materials such as steel are ordered in advance during the procurement stage, taking into consideration aspects
like as lead time (typically 60–180 days).
Figure 7: Detailed procedure of
the hull construction of an FPSO
unit

16. MAIN ACTIVITIES OF THE HULL CONSTRUCTION OF AN FPSO
Activities of the procurement stage
• After completing the basic and comprehensive design of an FPSO's hull, the first steel order is placed six months
before construction begins or steel cutting (W/C), taking into account the steel procurement lead time.
• The initial steel order contains bottom blocks, longitudinal bulkhead blocks, transverse bulkhead block plates, and
built-up elements that may be worked on ahead of time.
Activities of the dry dock stage
• The major tasks during the dry dock stage are the assembly of hull blocks, including L/Q, the installation of
appurtenances, and the loading of pipe racks.
• More information about this may be found below:
- Activities related to hull blocks
- Activities related to L/Q blocks
- Activities related to hull appurtenances
- Activities related to pipe racks

17. Activities of the on-shore stage
• After launching, the primary activities, such as hull cabling including L/Q, fire work, insulation/unit cabin installations,
pipe spool installation, and so on, are completed at the on-shore stage.
• If the total operation goes smoothly, the hull of the FPSO will be delivered following pre-commissioning and
commissioning. At this point, the on-shore interface work between the topside and the hull is critical for smoothly
hooking up SPS, which is installed in the field after sail away.
• Figure 8 depicts the launching of the FPSO's hull, which was fabricated by HSHI.
Figure 8: Launching and
dock out of the hull of an
FPSO unit

18. CONCLUSION
• This research delivers the following findings based on our extensive expertise with the technical design and
construction of an FPSO unit's hull.
• First, the FPSO field development strategy was investigated.
• Second, the comprehensive design techniques and activities of an FPSO unit's hull have been investigated.
• Third, the hull's construction techniques and activities have been investigated.
• Finally, crucial interaction work between systems and disciplines in hull building has been investigated.
• The aforementioned contents will be utilised as guidance to lessen M/H and cost implications on the design and
construction of future FPSO units' hulls.