Short Summary
Effective plant shutdown and turnaround planning starts well before the outage, with clear goals, a controlled scope, detailed work packs and early procurement. Most cost and schedule overruns can be traced back to issues such as scope creep, late materials, incomplete work packs and poor restart planning. A successful turnaround also depends on clear responsibilities across the asset owner, EPC contractors and onsite engineering and trade teams. By using readiness reviews, critical KPIs, FAT and SAT, and a structured post-shutdown review, teams can reduce execution and start-up risks while improving future outages.
Plant shutdown and turnaround planning is the structured process of preparing a facility for a planned outage, completing critical maintenance or upgrade work, and returning the plant to safe operation.
For a major turnaround, planning commonly begins 12 to 24 months before the shutdown, although the lead time varies with plant complexity, scope and long-lead procurement. Why so much preparation? Because most turnaround delays are created before the plant ever stops. A late material, a poor work pack or an uncontrolled scope change can become a critical-path problem once the outage begins.
Quick answer: Plant shutdown and turnaround planning is the process of preparing for a planned plant outage. It covers scope, cost, schedule, materials, contractors, safety and start-up, followed by a review after restart. Many large turnarounds need 12 to 24 months of planning.
Why Turnarounds Overrun Budget and Schedule
Most overruns come from weak planning, not bad luck on the day. These are the six most common causes.
- Scope creep. The work list keeps growing after it should be locked.
- Unplanned discovery work. Crews open equipment and find corrosion, cracks or worn parts, with no time or budget set aside.
- Late materials. Long-lead valves, exchanger bundles or alloy pipe arrive after they are needed.
- Poor work-pack quality. Jobs reach the field without confirmed materials, access, permits or tools.
- Unclear decision rights. The owner, contractors and trades are not sure who approves what.
- Weak start-up planning. Teams focus on taking the plant apart and forget the restart.
Turnaround Planning Timeline
Here is a typical plant shutdown and turnaround planning timeline for a large outage. Note that planning and procurement run in parallel.
| Timing | Primary focus |
|---|---|
| 18 to 24 months out | Strategy and business case |
| 12 to 18 months out | Scope development |
| 9 to 12 months out | Scope freeze |
| 6 to 12 months out | Detailed planning and work packs |
| 6 to 12 months out | Procurement and contractor engagement |
| 1 to 3 months out | Readiness reviews |
| Outage | Execution, commissioning and start-up |
| 1 to 3 months after | Review and lessons learned |
Planning Phases Explained
A good turnaround programme follows a clear sequence. Each phase has its own goal and its own sign-off.
1. Strategy and Business Case
Decide why the turnaround is needed: inspection, reliability work, a capacity upgrade, or all three. Set targets for safety, cost, duration and performance after restart. Name a turnaround manager and a core team.
Decision rule: If the team cannot state the purpose of the outage in one or two sentences, the strategy is not ready.
2. Scope Development
Collect work requests from operations, maintenance, inspection and projects. Challenge each one using inspection data, failure history and risk-based inspection results.
Decision rule: If a job can be done safely while the plant is running, challenge it before adding it to the outage.
3. Scope Freeze
Lock the scope on an agreed date. After that, every new job goes through a formal change process.
Decision rule: After scope freeze, every addition must show its impact on cost, duration, safety and the critical path before approval.
4. Detailed Planning and Scheduling
Break every job into work packs listing steps, crew, hours, tools, permits, isolations and materials. Build the schedule, find the critical path and add a discovery allowance based on past outages.
5. Procurement and Contractor Engagement
Order long-lead materials against required-on-site dates, not just order dates. Test critical equipment before it ships with a Factory Acceptance Test (FAT). A fault found at the maker’s workshop costs far less than one found mid-outage. Book contractors, cranes, scaffolding and specialist trades early.
6. Pre-Shutdown Readiness
Hold formal readiness reviews. Confirm that permits, isolations, safety plans, materials and people are in place. Walk the plant with the crews who will do the work.
7. Execution, Start-Up and Handover
Hold daily progress meetings and track work against the critical path. Before restart, run a Site Acceptance Test (SAT) on new or modified systems to confirm they work in their real setting.
How Do You Decide What Goes in the Turnaround Scope?
Not every maintenance request belongs in the outage. A job belongs in scope when it:
- needs the equipment isolated or the plant stopped
- creates a serious safety, integrity or production risk if deferred
- can be done much more efficiently during the outage
Use a simple priority matrix to rank the rest.
| Priority | Typical work | Decision |
|---|---|---|
| Critical | Safety-critical, statutory or production-critical | Must be in scope |
| High | Significant reliability or integrity risk | Include unless a safe alternative exists |
| Medium | Efficiency or reliability improvement | Include only if resources allow |
| Low | Can be safely deferred | Move to routine maintenance |
This matrix is a planning aid, not a substitute for engineering judgement, safety requirements or legal obligations.
In Australia, AS/NZS 3788 provides guidance for the in-service inspection of pressure equipment. Sites may also use risk-based inspection methods such as API RP 580, depending on their equipment, risk profile and applicable requirements.
Roles: Owner, EPC, and Onsite Trades
Clear roles are one of the simplest ways to protect a turnaround.
The asset owner is responsible for the turnaround as a whole. The owner sets goals, approves scope and budget, and makes the final call on risk. A single turnaround manager on the owner’s side should chair readiness reviews and control changes.
The EPC contractor (engineering, procurement and construction) is often used when the outage includes new equipment, upgrades or tie-ins. The EPC team should join during scope development, not in the final weeks.
Onsite engineers and trades do the physical work. When fitters, welders, electricians and instrument technicians review work packs early, they spot access problems and missing tools that planners may miss. Sarom Global’s Onsite Engineering and Trades team supplies engineers, technologists and tradespeople for shutdowns and turnarounds.
What Is the Difference Between FAT and SAT in a Plant Turnaround?
A FAT checks equipment before it leaves the supplier. A SAT checks that the installed equipment works correctly at the plant.
| FAT | SAT | |
|---|---|---|
| Full name | Factory Acceptance Test | Site Acceptance Test |
| When | Before equipment leaves the supplier | After installation on site |
| What it checks | Build quality and compliance with the specification | Installation and operation on site |
| Setting | Controlled factory environment | Real operating environment |
Both reduce the risk of start-up delays, so plan both into the turnaround schedule.
A Pre-Shutdown Checklist
Use this checklist in the months before your outage.
Scope and schedule
- ☐ Turnaround goals for safety, cost, duration and performance approved
- ☐ Scope freeze date approved and met
- ☐ All post-freeze changes documented with cost, schedule and risk impact
- ☐ Critical path reviewed by planning, operations and trades
- ☐ Discovery allowance included in time and budget
Materials and equipment
- ☐ Long-lead materials ordered against required-on-site dates
- ☐ FAT complete for critical valves, skids and control systems
- ☐ Materials physically on site, checked and staged near the work
- ☐ Crane, scaffold and access plans confirmed
People and work packs
- ☐ Critical work packs reviewed by the crews who will do the work
- ☐ Decision rights between owner, EPC and trades written down
- ☐ Contractors inducted and briefed
- ☐ Shift rosters and fatigue plans in place
Safety and control
- ☐ Isolation boundaries verified in the field
- ☐ Permit-to-work plan and high-risk job assessments complete
- ☐ Alarm and control system changes documented and reviewed
Commissioning and restart
- ☐ Mechanical completion criteria defined
- ☐ Commissioning sequence agreed
- ☐ Punch-list ownership assigned
- ☐ Critical punch items closed before start-up
- ☐ SAT plans ready for new or modified systems
- ☐ Restart sequence reviewed before shutdown begins
- ☐ Baseline plant performance data recorded
A Practical 5-Point Turnaround Readiness Test
Before you commit to a shutdown date, ask five questions. If any answer is “no”, the outage is at risk.
- Is the scope frozen?
- Are critical materials physically on site?
- Are work packs execution-ready?
- Are isolations and permits defined?
- Is the restart plan reviewed and tested?
Which Turnaround KPIs Should You Track?
A KPI is only useful if it helps the turnaround manager make a decision.
| Stage | KPI | What it tells you |
|---|---|---|
| Before | Work-pack readiness | Whether jobs can actually be executed |
| Before | Material availability | Which jobs could stall |
| Before | Engineering completion | Whether design work will hold up planning |
| During | Critical-path variance | Whether the outage is drifting |
| During | Scope changes | Early warning of scope-control problems |
| During | Safety performance | Whether pace is putting people at risk |
| After | Actual duration vs plan | How the outage performed overall |
| After | Final cost vs budget | How accurate the estimate was |
| After | Start-up delay | How well restart was planned |
Post-Shutdown Review
The turnaround is not over when the plant restarts. The review is where your next outage gets better.
- Compare results with targets. Look at cost, duration, safety and scope completed against the plan.
- Check plant performance. Formal plant performance testing shows whether the outage delivered the gains you wanted.
- Record discovery work. Note what crews found inside equipment. This sets a more realistic allowance next time.
- Investigate failures. A forensic failure analysis finds the root cause of any failure so it does not return.
- Assign lessons learned. Give each lesson an owner and build it into the next turnaround planning cycle. Otherwise it becomes a document nobody reads.
- Close out records. Update drawings, equipment records and maintenance plans.
When Should You Use an Owner’s Engineer for a Turnaround?
External support is most useful when internal teams are stretched or the outage carries high risk. Consider an owner’s engineer when:
- the scope includes complex modifications or major capital works
- several contractors must work in the same areas
- specialist testing such as FAT and SAT is needed
- commissioning and start-up are complex
- the outage has little schedule contingency
An owner’s engineer acts on your behalf, reviews designs, manages vendors and checks that contractors deliver what was agreed. This keeps the turnaround tied to your goals, not a contractor’s.
Plan Your Next Turnaround
Good plant shutdown and turnaround planning comes down to a few basics. A clear purpose, a firm scope freeze, tested equipment, defined roles and an honest review make the difference between an outage that runs to plan and one that does not.
Planning a major plant shutdown or turnaround? Sarom Global supports asset owners across Australia, EMEA, Asia Pacific and the Americas with owner’s engineering, onsite engineering and trades, FAT and SAT, commissioning support and forensic failure analysis. Talk to our team about the engineering and execution support your next outage needs, or explore our onsite engineering and trades services.