EPC/EPCm Model-Driven PEP Flowchart

EPC/EPCm Scope of Supply – Model Driven PEP

Lump-Sum Turn Key Execution (with Tendering, Authority Engineer, Execution & Billing)

%%{init: {"theme": "base", "themeVariables": {"fontSize": "12px", "lineColor":"#333"}} }%% flowchart TD %% === PRE-PROJECT: TENDERING PROCEDURE === T1["Pre-Qualification
RFQ Issuance"]:::tender T2["Bid Submission &
Evaluation"]:::tender T3["Contract Award &
LOI"]:::tender T4["Bill Submission:
Mobilization Advance"]:::bill %% === MAIN PHASES === A["Feasibility
Analysis"]:::phase B["Basic Engineering
Initial Estimate
Plant Design"]:::eng C["Detail Engineering
Core Design & Analysis"]:::eng D["Detail Checking
25% / 50% / 90% Model Review"]:::check E["Procurement
Piping Deliverables"]:::proc F["Detailing
AFC Drawings
Fabrication Details"]:::detail G["Execution:
Construction (Fab & Erection)
Site Mobilization"]:::const H["Commissioning
Punch List
As-Builts"]:::comm I["Close-Out
Client Documentation"]:::close J["Handover &
Warranty Start"]:::close %% === MILESTONES === M1["Model Setup"]:::milestone M2["FEED Complete"]:::milestone M3["Design Close-Out"]:::milestone M4["SKID Vendor
Mobilisation"]:::milestone M5["Client
Documentation"]:::milestone M6["As-Builts
Handover"]:::milestone M7["Bill Submission:
Interim Progress"]:::bill M8["Bill Submission:
Final Claims"]:::bill %% === AUTHORITY ENGINEER OVERSIGHT === AE1["Authority Engineer:
Design Approval"]:::auth AE2["Authority Engineer:
Construction Certs"]:::auth AE3["Authority Engineer:
Commissioning NOC"]:::auth %% === CONNECTIONS === T1 --> T2 --> T3 --> T4 --> A A --> M1 --> B --> M2 --> C --> D D -->|25% Review| AE1 D -->|50% Review| AE1 D -->|90% Review| AE1 --> E E --> M7 --> F -->|AFC Issued| G G --> AE2 G --> M3 G --> M4 G --> H H --> AE3 H --> M5 H --> M6 --> M8 --> I --> J %% === WORKSTREAMS (Parallel) === subgraph Process_OS ["Process, OS & Operation"] direction TB P1["Process Design"] --> P2["Operating Philosophy"] end subgraph Design_Unit ["Process & Design"] direction TB D1["Conceptual Design"] --> D2["3D Model Start"] end subgraph Designers ["Designers & Fabricators"] direction TB DF1["Detail Design"] --> DF2["Shop Drawings"] end subgraph Procurement_Unit ["Procurement & QA/QC"] direction TB PR1["Requisitions"] --> PR2["Vendor Data"] end subgraph Construction_Unit ["Construction & QA/QC"] direction TB CO1["Site Mobilization"] --> CO2["Mechanical Completion"] end B --> Process_OS C --> Design_Unit D --> Designers E --> Procurement_Unit G --> Construction_Unit %% === AUTHORITY ENGINEER SUBGRAPH === subgraph Authority ["Authority Engineer Oversight"] direction TB AE["Compliance &
Certifications"] end C --> Authority G --> Authority H --> Authority %% === RESOURCE CURVES === subgraph Resources ["Resource Commitment (incl. Oversight)"] direction LR R1["Engineering
Peak Early"]:::curve R2["Designers
Mid-Project"]:::curve R3["Detailers
Detailing Phase"]:::curve R4["Quality & Auth Eng
Construction & Close"]:::curve end A --> Resources %% === STYLING === classDef phase fill:#e3f2fd,stroke:#1a5fb4,stroke-width:2px,color:#000; classDef eng fill:#c8e6c9,stroke:#2e7d32,stroke-width:2px,color:#000; classDef check fill:#f8bbd0,stroke:#c2185b,stroke-width:2px,color:#000; classDef proc fill:#fff9c4,stroke:#f57f17,stroke-width:2px,color:#000; classDef detail fill:#d1c4e9,stroke:#6a1b9a,stroke-width:2px,color:#000; classDef const fill:#ffe0b2,stroke:#ef6c00,stroke-width:2px,color:#000; classDef comm fill:#b2dfdb,stroke:#00695c,stroke-width:2px,color:#000; classDef close fill:#ffcdd2,stroke:#c62828,stroke-width:2px,color:#000; classDef tender fill:#f3e5f5,stroke:#7b1fa2,stroke-width:2px,color:#000; classDef auth fill:#e1f5fe,stroke:#0277bd,stroke-width:2px,color:#000; classDef bill fill:#fff3e0,stroke:#f57c00,stroke-dasharray:5 5,stroke-width:3px,color:#000,font-weight:bold; classDef milestone fill:#ffeb3b,stroke:#f57f17,stroke-dasharray:5 5,stroke-width:3px,color:#000,font-weight:bold; classDef curve fill:#bbdefb,stroke:#1976d2,stroke-width:1px,color:#000,font-size:11px;

Tendering

Authority Engineer

Bill Submission

Feasibility

Basic/Detail Eng

Model Review

Procurement

Detailing

Execution/Construction

Commissioning

Close-Out

Milestone

Research Insights: Tendering follows FIDIC Red Book protocols for competitive bidding. Authority Engineers ensure third-party validation and compliance. Execution emphasizes milestone-based progress tracking in lump-sum contracts. Bill submissions are typically linked to RA bills covering 70–90% interim payments before final certification.