Turnkey Project: What It Includes and Why It Matters
What a turnkey project really includes: engineering, supply, logistics, civil works, installation, commissioning, training and O&M. Plus what to ask a supplier.
A turnkey project is one where a single party delivers the installation running and tested, not just a piece of equipment. For a tank or a treatment plant, that spans eight fronts: engineering, supply, logistics, civil works and foundation, installation, commissioning, training and operation and maintenance (O&M). The practical difference from buying piecemeal is who owns integration: in a turnkey scope, one contract absorbs the interfaces between disciplines, which is exactly where delays and overruns are born.
This guide details the full scope, lays out the phases in a table, and ends with the questions worth asking any supplier before you sign.
What the turnkey scope includes
1. Engineering
Process design and sizing from your data (flow, contaminant load, required volume), structural calculation to code (for bolted steel, AWWA D103), foundation drawings with loads, and detailed engineering of accessories and connections. This is the phase that defines everything else.
2. Supply
Provision of the tank or system equipment (reactor, gas holder, cover, pumps, blowers, instrumentation) with its coating and certificates. In an integrated solution, the supplier is accountable for compatibility between components, not just for each part.
3. Logistics
Importation, ocean and land transport, customs clearance and on-site delivery. For imported equipment this front weighs heavily on total lead time; keeping it inside the contract stops customs or freight from becoming the client's problem.
4. Civil works and foundation
Execution or coordination of the concrete slab or ring beam, drainage and platforms. The foundation is the most common mistake when buying piecemeal: here it is integrated into the schedule and calculated with the equipment's real loads.
5. Installation
On-site assembly with specialized crews. Bolted steel tanks use hydraulic-jack erection, which builds from the top down at ground level, with no welding at height: safer and much faster than field welding.
6. Commissioning
Leak tests, start-up, tuning of process parameters and verification that the installation meets the specification. Without commissioning, the equipment is assembled but there is no guarantee it works as intended.
7. Training
Training for the staff who will operate the plant: procedures, safety, instrument reading and routines. A well-delivered installation that is poorly operated performs below its design.
8. Operation and maintenance (O&M)
Manuals, inspection plan, spare-parts list and, depending on the contract, recurring support or service. It closes the loop: the installation not only starts up, it is sustained over time.
Project phases: from inquiry to operation
| Phase | What happens | Deliverable | Who takes part |
|---|---|---|---|
| 1. Survey | Site, fluid, flow and goals data | Design basis | Client + engineering |
| 2. Engineering | Process design, structural calc, drawings | Executive project | Engineering |
| 3. Supply and logistics | Fabrication, importation, transport | Equipment on site | Supplier |
| 4. Civil works | Foundation, drainage, platforms | Base ready to erect | Civil |
| 5. Installation | Hydraulic-jack erection | Assembled installation | Erection crew |
| 6. Commissioning | Tests, start-up, tuning | Operational installation | Commissioning |
| 7. Training and O&M | Training, manuals, support | Autonomous operation | Client + support |
Why it matters: integration is the real value
When each front is contracted to a different supplier, the interfaces have no owner. The tank maker says the foundation was wrong; the civil contractor says the loads arrived late; the erector says accessories were missing. In a turnkey scope, that risk is absorbed by a single party, and the client measures the result, not the excuses. It is what let us erect three bolted steel tanks for the largest data center in Latin America, in Uruguay, in 28 days, or deliver complete plants such as the Marks Foods biogas plant and the Paraibuna wastewater plant.
What to ask a turnkey supplier
- Does the scope include foundation and civil works, or only the equipment? Ask for it explicitly in the quote.
- Under which standard is the structure calculated? It must be cited (for example, AWWA D103) in the report.
- Is the lead time door-to-door, including logistics and customs? Separate fabrication, transport and installation.
- Are commissioning and documented leak tests included? Without commissioning there is no performance guarantee.
- Are training, manuals and spare parts included? Define the O&M scope in writing.
- Who is the single party responsible if something goes wrong on site? The answer must be one company.
How we work at Tech Tank
Tech Tank is a turnkey integrator of storage and treatment solutions: bolted steel tanks, biodigesters, aluminum geodesic domes and covers. We cover all eight phases, from engineering to O&M, with headquarters in Brazil and regional operations in Paraguay and several countries. You can see the approach by application in potable water (WTP), wastewater treatment and biogas, or browse real cases in our projects. If you have a project in the pipeline, send us the data and we will build the scope with a clear lead time and clear responsibilities.
Frequently Asked Questions
What is the difference between turnkey and buying the equipment separately?
In a turnkey scope a single party delivers the installation running: engineering, supply, civil works, installation and commissioning under one contract. Buying piecemeal, each interface between suppliers has no owner, and that is where delays and overruns appear. Turnkey costs the supplier more to coordinate, but it moves that risk off the client.
Are the foundation and civil works included?
In a complete turnkey scope, yes: the foundation is calculated with the equipment's real loads and integrated into the schedule. It is key to request it explicitly, because when you buy only the equipment the foundation is often left out and becomes the project's first overrun.
What is commissioning?
It is the testing and start-up phase: tank leak tightness, equipment verification, tuning of process parameters and confirmation that the installation meets the specification. Without documented commissioning, the equipment may be assembled but there is no guarantee it operates as intended.
How long does a turnkey project take?
It depends on the scope, but hydraulic-jack erection shortens the work sharply: tanks that would take months in a welded version are assembled in weeks. For reference, we erected three tanks for a data center in 28 days. Total lead time adds engineering, fabrication and logistics, which are planned from the start.
Does it include staff training and maintenance?
In a good turnkey contract, yes: training for the operating team, manuals, an inspection plan and a spare-parts list, and depending on the agreement, recurring support. It is best to define the O&M scope in writing to avoid gray areas after handover.