Process Management

Engineering Design

Concept to construction. Engineered in Nigeria.

Decisions taken at the design stage govern what a facility costs to build and what it costs to run for the next twenty years. AOS Orwell provides multi-discipline engineering design across the full project lifecycle, from feasibility and concept selection through FEED to issued-for-construction deliverables—supported by an operations and maintenance business that keeps our designs grounded in how plants actually run.

Explore our capability arrow_downward Discuss your project arrow_forward
AOS Orwell engineers working at CAD workstations
image Add engineering-floor photograph

Wide shot of AOS Orwell engineers at multi-monitor CAD workstations, photographed from behind at a low angle.

architecture
In-country engineering capability

Multi-discipline engineering supported by operational experience.

Project lifecycle expertise

Engineering that considers how the facility will actually be built, operated and maintained

Our engineering teams support projects from the earliest investment and development decisions through design, procurement, fabrication, construction, commissioning and as-built handover. The result is a coordinated design that responds to technical, commercial, construction and whole-life operating requirements.

account_tree

Full project lifecycle

Support from feasibility and concept selection through FEED, detailed design, construction and as-built documentation.

hub

Multi-discipline delivery

Coordinated process, mechanical, piping, civil, structural, electrical, instrumentation and safety engineering.

engineering

Operationally informed

Designs informed by real maintenance, access, sparing, isolation and equipment-performance experience.

Design and engineering

Multi-discipline engineering from concept to construction

Coordinated engineering disciplines, industry-standard platforms and controlled review processes support designs that are technically sound, constructable and maintainable.

Our engineering design capability spans the disciplines required to take a facility from concept to construction: process, mechanical, piping, civil and structural, electrical, instrumentation and control, and safety engineering. Teams work to client specifications and recognised international codes, with deliverables produced on industry-standard engineering platforms and controlled through a formal review and approval process. Because AOS Orwell also operates and maintains producing assets, our designs are tested against the discipline most engineering houses never see—the maintainability, sparing and access realities that determine whole-life cost.

AOS Orwell engineers conducting a 3D model review
image Add 3D model-review photograph

Two or three AOS Orwell engineers around a large screen during a collaborative 3D model review.

check Process and process safety engineering
check Mechanical and rotating equipment engineering
check Piping design, stress analysis and material specification
check Civil and structural engineering
check Electrical power systems and distribution design
check Instrumentation, control and ICSS design
check Pipeline and flow assurance engineering
check Materials, corrosion and integrity engineering
check 3D modelling, clash detection and model reviews
check Engineering studies, design reviews and technical assurance
Front-end definition

FEED and Feasibility Studies

Define the opportunity, test the options and understand the technical and commercial risk before major project commitments are made.

The cheapest place to change a project is on paper. Feasibility and FEED are where scope is defined, options are tested and the cost of the entire development is effectively set—and where the greatest value is either captured or lost. AOS Orwell delivers feasibility studies that screen technical and commercial options against a client’s investment criteria, and Front End Engineering Design that converts a selected concept into a frozen, costed and executable scope. The output is a design basis robust enough to support a final investment decision and clear enough to tender competitively, with technical risk understood and priced before commitment.

AOS Orwell engineering design review or HAZOP session
image Add design-review or HAZOP photograph

Participants engaged around P&IDs during a formal design review or HAZOP session.

02A / Options and investment screening

Feasibility & Concept Select

Evaluate development options and identify the concept that best satisfies technical, commercial and operational requirements.

  • check Technical and economic screening of development options
  • check Concept selection studies and option ranking
  • check Field development and debottlenecking studies
  • check Brownfield modification and tie-in feasibility
  • check Order-of-magnitude cost estimating to support screening decisions
02B / Scope definition

Front End Engineering Design

Convert the selected concept into a coordinated, costed and executable scope suitable for investment approval and competitive tendering.

  • check Design basis, philosophies and specifications
  • check Process flow diagrams, heat and material balances, and P&IDs
  • check Equipment sizing, datasheets and technical requisitions
  • check Plot plans, layouts and preliminary 3D models
  • check HAZID, HAZOP and design safety studies
  • check Definitive cost estimate to support final investment decision
  • check Project execution strategy, schedule and contracting plan
  • check Long-lead item identification and procurement definition
Detailed design

Detailed Engineering Design

Detailed design is where a frozen scope becomes something a contractor can build. AOS Orwell produces the full issued-for-construction deliverable set— drawings, models, specifications, datasheets and material take-offs—engineered to be constructable, procurable and maintainable. Multi-discipline work is coordinated through a controlled 3D model with clash resolution, and vendor data is integrated as equipment is purchased so the design reflects what is actually being installed. We carry the design through procurement, fabrication and construction support to as-built handover, which means the team that specified the plant remains accountable for it through commissioning.

Engineering 3D model
view_in_ar Add project 3D model

Use an original project model or approved engineering-model screenshot.

Design

Coordinated 3D engineering model

Completed as-built facility installation
factory Add matching as-built installation

Use the completed installation corresponding with the adjacent 3D engineering model.

Delivery

Constructed and commissioned installation

check Issued-for-construction drawings across all disciplines
check Detailed 3D modelling, clash detection and model review
check Piping isometrics, line lists and stress analysis
check Equipment and instrument datasheets and specifications
check Electrical single-line diagrams, cable schedules and load lists
check Control-system architecture, loop diagrams and cause-and-effect charts
check Structural detailing and fabrication drawings
check Material take-offs and procurement support
check Vendor-document review and technical-bid evaluation
check Construction support, field engineering and as-built documentation
AOS Orwell engineer working at an operational facility
image Add AOS Orwell engineer-on-site photograph

An engineer in AOS Orwell PPE at a live facility, preferably one of the company’s operations and maintenance assets.

04 / Why AOS Orwell

The designers remain accountable for how the plant performs

Most engineering houses hand over at the end of detailed design. We do not. AOS Orwell operates and maintains producing facilities, which means our designers are held to account by colleagues who will later have to maintain what they specified. That feedback loop shows up in access, sparing, isolation philosophy and equipment selection—the details that separate a plant that runs from a plant that is merely technically correct. Our capability is resourced in-country and engineered to the standards our clients answer to.

check_circle Operations-informed design decisions
check_circle In-country engineering resources
check_circle Whole-life cost and maintainability focus
check_circle Support through construction and commissioning
Engineering design enquiries

Let’s define your project before the cost of change increases.

Share your feasibility, FEED, detailed-engineering, brownfield-modification or technical-assurance requirements with our engineering team.

Discuss your project arrow_forward
© 2025 AOS Orwell. All rights reserved.