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Detailed Engineering

Detailed engineering for FPSO (Floating Production Storage and Offloading) topside modules is a highly specialized process that transforms the conceptual and preliminary designs developed during FEED into fully detailed, construction-ready designs.

The topsides of an FPSO are where the primary production and processing activities occur, requiring meticulous design for efficiency, safety, and functionality in offshore environments.

The various Detailed Engineering scope which will be engineered by OFS India as below:

Schedule Development

Develop P6 schedule up to Level 4 for all deliverables and milestones as listed as per project requirements, create a MDR in line with the Level 4 schedule.

Interface Management

Define interfaces and integrate them with applicable systems and subsystems during detailed engineering.

Detailed Design

Carry out detailed engineering of piping, structural, electrical and instrument disciplines based on basic design documents, philosophies, and specifications.

The various Detail Engineering scope which will be engineered by OFS India as below:

  • Develop P6 schedule up to Level 4 for all deliverables and milestones as listed as per project requirements, and create a MDR in line with the Level 4 schedule. This list shall indicate the documents that are to be generated during detailed engineering using FEED Engineering deliverables as inputs.
  • Prepare engineering drawings and documents in sufficient detail without any hold, including incorporation of vendor data to construct and assemble the topsides facilities, perform pre-commissioning, initial start-up, and make ready for long-term operation and maintenance.
  • Define interfaces and integrate them with applicable systems and subsystems during detailed engineering.
  • Ensure the design complies with the EC’s Human Factors Engineering.
  • Interface with the Marine and Mooring disciplines, as well as third-party suppliers and other subcontractors & various fabrication yards.
  • Carry out detailed engineering of piping, structural, electrical, and instrument disciplines based on basic design documents, philosophies, and specifications.
  • Review and incorporate third-party supplier documents/details for compliance with Project requirements and for interface-related design requirements.

Key deliverables as part of Detailed Engineering includes:

General Arrangement (GA) Drawings: Layouts of modules, equipment, and access routes
Isometric Drawings: Detailed fabrication drawings for piping systems
Structural Fabrication Drawings: Construction-ready designs for module frames and supports
Electrical Layouts: Cable routing, single-line diagrams, and lighting layouts
Instrument Hook-Up Diagrams: Detailed wiring and tubing layouts
Material Take-Offs (MTO): Comprehensive lists for procurement of materials and equipment
Safety Reports: HSE compliance documents, including blast analysis and escape route plans

Detailed Engineering workflow for FPSO topside modules

Process Engineering

  • • Refinement of Process Flow Diagrams (PFDs) and Piping and Instrumentation Diagrams (P&IDs)
  • • Detailed heat and material balance calculations
  • • Equipment sizing and specifications (vessels, pumps, compressors, heat exchangers)
  • • Hydraulic calculations for flowlines and risers

Piping Engineering

  • • 3D Modelling: Creating detailed 3D layouts of piping systems using software like PDMS, E3D, or Smart Plant
  • • Stress Analysis: Ensuring structural integrity under operational and environmental loads
  • • Isometric Drawings: Generation of detailed fabrication drawings for each pipeline
  • • Material Selection: Based on process requirements (e.g., corrosion resistance, high-pressure systems)

Structural Engineering

  • • Detailed design of module support structures, walkways, and skid frames
  • • Load calculations, including operational, environmental, and dynamic loads
  • • Integration of topside modules with the FPSO hull, ensuring structural stability
  • • Fabrication-ready drawings and welding plans

Electrical and Instrumentation (E&I) Engineering

  • • Cable tray and routing design
  • • Sizing of power distribution systems, switchgear, and transformers
  • • Instrumentation wiring and loop diagrams
  • • Explosion-proof and hazardous area classification designs
  • • Detailed control system designs (e.g., DCS, PLC, SCADA)

Safety and HSE Engineering:

  • • Implementation of safety studies such as HAZOP and SIL analysis.
  • • Fire and gas detection layouts.
  • • Blast and explosion protection designs.
  • • Emergency escape route planning.

Mechanical Engineering:

  • • Review of Vendor documents for required inputs for various disciplines to complete their detail engineering and produce the documents.
  • • Integration of rotating and static equipment within modules.

Integration Engineering:

  • • Interface management between topside modules, risers, subsea systems, and the FPSO hull.
  • • Design of tie-ins for fluid transfer, power, and communication systems.
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Old Baiyyappanahalli, Maruthi Sevanagar,
Old Madras Road,
Bengaluru, Karnataka 560038

in.ofsi.hrd@toyo-eng.com

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