Engineering Design for Industrial and Energy Projects
Engineering design is a fundamental phase in the delivery of a project or facility. During this phase, technical requirements, client needs and statutory requirements are coordinated to produce the documentation required for implementation.
Well-prepared engineering and process design for energy projects can help ensure that a project is delivered more safely, predictably and under greater control.
The Scope and Importance of Engineering Design
The purpose of engineering design is to transform project concepts into technically sound and documented solutions that provide a reliable basis for construction.
During the process, the required documentation is developed by coordinating client requirements, statutory provisions and technical criteria.
Engineering design and the associated engineering planning activities aim to ensure that the facility is functionally suitable, technically safe, cost-effective and compliant with applicable requirements.
The scope of design may typically include the following:
development of the technical concept and alternative solutions,
performance of sizing calculations and verification checks,
preparation of detailed drawings and technical specifications,
selection of materials, equipment and technologies,
design of process systems and definition of their technical requirements,
consideration of standards, regulations and authority requirements,
support for cost and scheduling considerations.
A properly prepared design process can help ensure that construction is based on pre-considered and documented technical solutions rather than on-site compromises or ad hoc decisions.
In the longer term, this can reduce technical risks, the number of subsequent modifications and the overall project cost.
For industrial and energy projects, process engineering design and energy engineering design can play a decisive role in establishing safe, economical and sustainable long-term operation.
What Benefits Does Engineering Design Offer the Client and the Contractor?
Well-prepared engineering design can support both client decision-making and more efficient construction delivery.
Detailed design documentation can improve predictability, cost control and verifiability, while reducing construction risks and providing a clearer technical basis for all project participants, particularly in industrial and energy projects.
Benefits of Design for the Client
From the client’s perspective, engineering design can primarily provide greater security and predictability during project preparation and delivery.
Detailed designs can help to:
define the project’s technical scope and expected cost more accurately,
reduce the risk of additional costs arising during construction,
ensure that functional, operational and long-term requirements are met,
make it easier to verify whether construction meets the client’s requirements.
Properly developed design documentation can also provide a technical and legal reference basis for contracting, performance verification and the resolution of potential disputes.
Benefits of Design for the Contractor
From the contractor’s perspective, engineering design can form one of the foundations of efficient and cost-effective delivery
A clearly defined technical scope:
supports more accurate scheduling of construction activities,
reduces interpretation uncertainties and the need for on-site decisions,
can limit material waste and unproductive labour time,
supports more accurate resource planning.
Detailed designs can help contractors commit to deadlines and budgets with greater confidence, while reducing the risk of repairs and modifications resulting from defective construction.
A well-founded design process supports documentation quality, transparent project preparation, cost control and the reduction of construction risks.
Design can therefore support both client decisions and more efficient preparation for delivery, whether the project involves energy and process systems or industrial facilities requiring engineering design.
Why Is Engineering Design Important for Authority Procedures and Regulatory Compliance?
Professionally developed engineering designs can play an important role in preparing construction and supporting permitting and authority procedures. Detailed permit design documentation can improve verifiability, support evidence of compliance and establish a clearer technical basis.
The Role of Design in Authority Procedures
During permitting and notification procedures, the submitted permit design documentation may be assessed in relation to:
compliance with applicable legislation, standards and technical requirements,
compliance with safety, environmental and operational requirements,
risks associated with the facility and their management.
Detailed and professionally prepared permit design documentation can help accelerate permitting procedures, reduce the number of requests for supplementary information and provide a clear basis for subsequent authority inspections.
The process may also include ongoing liaison with the permitting authorities. The design process is a key tool in the preparation and delivery of projects.
It simultaneously supports the client’s interests, more predictable construction preparation and regulatory compliance, while contributing in the longer term to cost control, safer operation and reduced risk.
Why Are Design Phases Important in a Complex Project?
The purpose of design phases is to ensure that complex technical projects – particularly industrial and energy projects and developments implemented in process or mechanical engineering environments – progress gradually and in a controlled manner rather than through a single decision point.
This allows risks, commitments and investment decisions to be aligned with the project’s current level of maturity.
The primary purpose of the early design phases is to determine whether a solution is technically feasible, economically justifiable and capable of meeting essential safety or authority requirements.
Decisions made during these phases can have a major impact on the overall cost and risk profile of the project, while changes can still be made at relatively low cost.
Later design phases focus primarily on the methods and details required for construction.
Cost Control and Progressive Decision-Making
As the design phases progress, the technical scope becomes increasingly detailed, enabling more accurate cost estimates and better-founded investment decisions for energy, process and other industrial projects.
This helps project stakeholders avoid making irreversible financial decisions based on uncertain information.
Multidisciplinary Cooperation and Responsibilities
Design phases coordinate cooperation between disciplines such as process engineering, mechanical engineering, electrical systems, control and instrumentation, and environmental protection.
This can reduce clashes between disciplines and help identify problems while the project is still in the design phase.
Permitting and Compliance
Design phases can separate internal decision-support design levels from permit design documentation, making it easier to determine when a design provides a suitable basis for authority submission or further consultation.
They can support more predictable decision-making, cost control and the reduction of technical, financial and legal risks, while providing a common reference point for project participants.
What Are the Main Project Phases of Engineering Design?
Engineering design for industrial and energy projects typically progresses through several consecutive project phases.
Each phase serves a different purpose: early phases primarily support feasibility assessment and investment decision preparation, while later design levels define the details required for construction.
Pre-FEED (Concept Design)
Purpose
Assessment of feasibility and the main alternatives
Typical content:
assessment of process alternatives and potential technical solutions,
order-of-magnitude CAPEX/OPEX estimate (±30–50%),
identification of key risks and likely permitting routes.
Decision point
Is further design justified?
FEED (Front End Engineering Design)
Purpose
Establishing the project’s technical and process engineering basis and supporting the investment decision
Typical content:
finalisation of the process concept and principal technical solutions,
PFD and preliminary P&ID,
key sizing calculations and layout concepts,
ENG cost estimate (±15–25%).
Decision point
Final Investment Decision (FID)
Basic Engineering / BED (Basic Design)
Purpose
A technically unambiguous design level prepared for the next stage of implementation
Typical content:
final P&ID,
equipment lists and main data sheets,
system-level calculations and technical checks,
coordination of the different disciplines and process systems.
Result
A design suitable for tendering and authority consultation.
Tender Design
Purpose
technical specifications,
definition of battery limits and scope boundaries,
BOQ / bill of quantities.
Result
Comparable contractor bids.
Detailed Engineering / Execution Design
Purpose
Direct support for construction
Typical content:
fabrication and installation drawings,
detailed calculations,
cable, piping and structural support lists.
Level of detail
A “buildable design” used directly for construction.
As-Built / Close-Out Documentation
Purpose
Documentation of the completed condition
Typical content:
as-built drawings,
final documentation,
basis for maintenance and operation.
Result
Support for subsequent operation and maintenance activities.
The different project phases form consecutive decision points as the design process progresses. Their purpose is to enable increasingly accurate technical definition, better-founded investment decisions and more predictable delivery.
What Is the Difference Between FEED, Basic Engineering and Detailed Engineering?
Project phases represent successive decision points. The early phases (Pre-FEED and FEED) primarily address what should be implemented, while key decisions affecting project costs and risks are also made at this stage.
FEED includes the feasibility study, but the technical scope is not yet considered final. Basic Engineering contains more detailed technical solutions and provides the basis for subsequent detailed engineering.
Later design levels – particularly Detailed Engineering and As-Built documentation – focus on how the project is implemented.
Detailed Engineering contains the documentation required for construction, while As-Built documentation provides the documentary basis for operation and maintenance.
1. Pre-FEED (Concept Design)
Feasibility and main alternatives
Decision: Is further design justified?
2. FEED (Front-End Engineering Design)
Technical basis, PFD and preliminary P&ID
Decision: Final Investment Decision (FID)
3. Basic Engineering / BED
Final P&ID and equipment lists
Result: Design suitable for tendering
5. Detailed Engineering
Fabrication and installation drawings
Level of detail: “Buildable design”
6. As-Built / Close-out
Documentation of the completed condition
Result: Basis for operation and maintenance
Typical Engineering Disciplines and Their Interaction
For complex systems, engineering and process design typically relies on collaboration between several interconnected disciplines. Each discipline is responsible for different technical tasks, while its decisions may directly affect the configuration, operation or compliance of other systems.
Coordinating the disciplines therefore plays a decisive role in developing safe, cost-effective and buildable designs, particularly for industrial and energy projects, process systems and oil and gas facilities.
Process Engineering Design
definition of process flows and main operating states,
definition of the quantitative and qualitative properties of process media,
development of operating and protective solutions,
process sizing of system components, including machinery, equipment, piping and vessels,
provision of an overall description of the complete project,
preparation of process flow diagrams.
verification of guaranteed quantitative and qualitative parameters during operation or trial operation,
provision of essential design input data for all other disciplines,
influence on control and automation concepts,
process descriptions, including design and operating parameters, form a basis for permitting,
provision of essential information for operations personnel.
Architectural Design
spatial and functional arrangement of the facility,
definition of room relationships and adjacencies,
design of building structures, including walls, floors and roofs.
provides the basis for routing mechanical, electrical and control systems,
defines the locations of plant rooms, switch rooms and cable spaces,
supports coordinated development of the different process systems.
Structural Engineering Design
sizing of load-bearing structures,
consideration of loads from machinery, vessels and piping,
assessment of vibration, seismic effects and wind pressure.
coordination with mechanical engineering in the placement of heavy equipment,
provides an essential basis for the design and installation of process systems,
may affect lightning protection and earthing systems.
Process Mechanical Engineering
building services systems, including HVAC, water, drainage and gas systems,
design of industrial mechanical systems and process piping,
pressurised systems subject to the PED.
provides electrical design with power demand data,
provides automation with control requirements,
defines spatial requirements for architecture,
requires structural support from structural engineering.
Electrical Power Supply and Electrical Engineering Design
low- and high-voltage systems,
distribution boards, cabling and lighting,
motors, drives and variable-frequency drives,
emergency and backup power supply.
supplies the power required by mechanical systems,
enables the operation of control and instrumentation systems,
interfaces with lightning protection and earthing systems,
forms an integral part of energy engineering design and process system development.
Control and Automation Engineering (PLC, DCS, SCADA)
control and regulation of process operations,
process safety and alarm management,
development of field instrumentation and higher-level control systems,
data acquisition and remote supervision.
interfaces with sensors and actuators in mechanical systems,
requires an electrical power supply,
may be linked to authority requirements from a functional safety perspective.
Lightning Protection and Earthing
external and internal lightning protection,
surge protection,
equipotential bonding,
protection of people and equipment.
connects electrical, control and structural systems,
plays a decisive role in protecting sensitive electronic systems,
may be subject to authority inspection.
Fire Protection Design
fire compartmentation,
smoke and heat extraction,
fire detection and suppression systems,
design of escape routes.
affects architecture, mechanical engineering and electrical systems,
interfaces with control engineering through automated actions,
may be subject to strict authority control.
Environmental and Process Engineering Design
management of emissions, noise, wastewater and waste,
management of hazardous substances,
preparation of process descriptions and related technical documentation.
may provide input data for mechanical, automation and process systems,
can play a decisive role in authority permitting procedures.
An effective design process operates as an integrated system in which the individual disciplines continuously influence one another. A modification in one area often affects several others, making coordination and alignment of information essential to project success.
In many cases, the real value lies in the consistency of the individual designs and the cooperation between disciplines.
Would You Like to Establish a More Predictable Basis for Project Preparation and Delivery?
Let’s discuss how an appropriate design process can support investment decisions, cost control, compliance requirements and safer project preparation.
For complex industrial, energy or process projects, well-founded design can help reduce risks, improve transparency in decision-making and enable more predictable construction delivery.
Further questions about the design process, project phases or the role of individual disciplines are addressed in the FAQ section below.
Frequently Asked Questions About Engineering Design for Industrial and Energy Projects
When should the design team be involved in project preparation?
The design team should ideally be involved at the earliest stage of project preparation, when the objectives and technical framework are beginning to take shape.
Early cooperation can help assess feasibility, expected costs and potential technical constraints realistically before major investment decisions are made.
What information is required to begin engineering design?
The design process typically requires a clear understanding of the project objectives, available input data – such as process fluid properties, capacity requirements or site conditions – and the applicable regulatory and safety requirements.
The more accurate the input data, the more reliable the resulting design is likely to be and the fewer subsequent modifications it may require.
How can design help reduce project risks?
Well-prepared design can identify technical, sizing and process risks before construction begins, helping prevent costly modifications or operational failures at a later stage.
Model-based calculations and simulations used in process engineering design can support well-founded decisions before the project reaches an irreversible stage.
What deliverables or documents are produced during the design process?
The design process typically produces process designs, flow diagrams, sizing calculations, equipment and machinery specifications, and the associated technical documentation.
Depending on the nature of the project, these may be supplemented by mechanical, electrical or other engineering design documents. Together, they form the basis for procurement, construction and permitting.
When is a design considered suitable for construction?
A design is considered suitable for construction when all relevant disciplines have completed a coordinated review, sizing calculations and specifications are final, and the documentation complies with applicable standards and permitting requirements.
At this stage, the process, mechanical and other engineering design documents form a consistent system, enabling the contractor to work from a clear and complete technical basis.
Which disciplines may need to cooperate on a complex industrial or energy project?
A complex industrial or energy project typically requires coordinated work across several disciplines.
In addition to process engineering design and related engineering activities, these may include mechanical engineering, structural engineering, architecture, control and instrumentation, electrical power supply, fire and explosion protection, environmental protection and occupational safety.
Their coordinated cooperation is essential for safe, cost-effective and compliant project delivery.
