A plant modification can be designed in a few weeks or drag on for months. The difference usually comes down to how clearly the design work was defined and how well the disciplines talked to each other. Here is what industrial engineering design services cover, the stages design passes through, and when project owners and EPC contractors bring in outside design support.
What are industrial engineering design services?
Industrial engineering design services produce the calculations, drawings, specifications and data that define how an industrial facility or modification will be built. They span process, civil and structural, mechanical, piping, electrical and instrumentation disciplines, and they end with documents a contractor can procure and build from.
The stages of industrial design
| Stage | Question it answers | Typical outputs |
|---|---|---|
| Concept or feasibility | Is the project technically and commercially viable? | Options study, outline layout, early estimate |
| FEED (front-end engineering design) | What exactly will be built, and roughly what will it cost? | PFDs, preliminary P&IDs, plot plan, equipment list, specifications |
| Detailed engineering | How will it be built? | IFC drawings, isometrics, cable schedules, datasheets, material take-offs |
| Construction support | Does the built work match the design? | RFI responses, field changes, as-built drawings |
Compressing FEED is a common source of trouble. Decisions that should have been made at FEED get made during detailed engineering instead, when every change ripples through several disciplines at once.
Disciplines involved
- Process: heat and material balances, PFDs, P&IDs and equipment sizing
- Civil and structural: foundations, steel structures, drainage and roads
- Mechanical: specification and selection of static and rotating equipment
- Piping: layout, stress analysis, isometrics and supports
- Electrical: power distribution, single line diagrams, cable sizing and earthing
- Instrumentation and control: instrument specification, control philosophy and loop diagrams
Each discipline depends on data from the others. How that exchange is managed is covered in mechanical, electrical and instrumentation design coordination.
When outside design support makes sense
Owners and contractors commonly bring in external design capacity when:
- The in-house team is fully loaded and a new project or modification lands
- A brownfield modification needs surveys and field verification in an unfamiliar facility
- A discipline is missing in-house, often E&I or structural
- Design support needs to continue on site through construction
Brownfield work deserves a specific mention. Drawings for older plants are often out of date, and a design built on unchecked as-builts tends to fail at the tie-in point. Field verification should be written into the design scope, not left as an assumption.
Getting the scope right first
The quality of a design package depends heavily on how the work was scoped. A clear basis of design, defined battery limits and an agreed deliverables list prevent most of the disputes that come up later. The step-by-step method is in how to scope engineering design for an industrial project, and the documents that should exist before work starts on site are listed in engineering deliverables required before industrial construction.
Design support from Apex Core Engineering
Apex Core Engineering offers engineering design through its design services, alongside construction management and workforce support. That combination helps when the people producing drawings need to stay close to the people building from them, especially on modifications where field conditions shape the design. For the site-side benefit of that link, see how design coordination reduces rework.
Frequently asked questions
What is the difference between FEED and detailed engineering?
FEED defines what will be built and supports the investment decision and contractor tendering. Detailed engineering produces the construction-ready drawings, lists and specifications.
Do small plant modifications need formal engineering design?
Yes, scaled to the size of the change. Even a small tie-in can affect process safety, piping stress, supports and instrumentation, and it should pass through the plant’s management of change process.
Does design work continue during construction?
Usually. Construction support covers technical queries, field changes and the as-built drawings issued at the end of the project.
Share your design requirement with Apex Core Engineering to discuss the support you need.