How to Plan a Turnaround: Step-by-Step Process from Scoping to Startup

Ask any experienced turnaround manager what separates a successful turnaround from a costly one, and the answer is almost always the same: planning. Not execution. Not contractor selection. Not even safety culture — though all of those matter enormously. The single biggest predictor of a turnaround’s success is the quality and depth of the work done in the months before the plant ever stops.

The industry has a saying: “A turnaround is won or lost in the planning room, not on the job site.”

This guide walks you through the complete turnaround planning process — from the first scoping meeting all the way to the post-startup review — so you understand exactly what needs to happen, when, and why.

Why Turnaround Planning Takes So Long

A major turnaround at a refinery or chemical plant might involve 2,000 to 5,000 contract workers, tens of thousands of individual work tasks, hundreds of pieces of equipment, and a budget of $50 million to $150 million or more. It must be executed safely, within a tight schedule, in a facility that is both hazardous and economically critical.

You cannot improvise at that scale. Every day of downtime costs money — sometimes millions of dollars per day in lost production. Every shortcut in planning creates risk: a missing material holds up a critical job; a poorly written work package leads to rework; a scheduling gap leaves scaffolding erected and crew standing idle.

This is why best-practice turnaround planning begins 18 to 24 months before the execution date. For very large, complex facilities, planning starts even earlier.

Here is how that time is structured.

Phase 1: Scope Development (18–24 Months Before Execution)

Everything starts with scope. The scope of a turnaround defines what work will be done — and crucially, what will not be done. Getting this right is arguably the most important phase in the entire process.

What is scope development?

Scope development is the process of identifying, reviewing, and approving all the work tasks that will be included in the turnaround. Sources of scope typically include:

Regulatory inspection requirements — vessels, boilers, and pressure equipment that must be inspected on a set interval by law or insurance requirement
Preventive maintenance schedules — equipment that has reached its maintenance interval
Corrective maintenance backlog — known defects and deficiencies that cannot be repaired online
Process improvements and modifications — engineering changes that require the unit to be shut down
Operations and reliability inputs — items flagged by operators and reliability engineers from day-to-day experience

What is scope freeze?

At a defined point — typically 9 to 12 months before execution — the scope is “frozen.” This means that after the freeze date, new work items can only be added through a formal scope change process with management approval. Late scope additions are one of the most common causes of turnaround cost and schedule overruns.

Scope freeze is not about refusing necessary work. It is about making deliberate decisions about trade-offs early enough that the planning team can prepare properly.

Practical tips for scope development

Walk the unit with operators, inspectors, and reliability engineers together. Different perspectives catch different issues.
Challenge every item: “Can this be done online?” If yes, it should come off the list.
Classify work by criticality: regulatory requirements are non-negotiable; nice-to-have improvements can be deferred.
Build a scope register with unique identifiers for every work item — this becomes the backbone of your planning database.

Phase 2: Detailed Planning and Work Package Development (12–18 Months Before Execution)

Once the scope is defined, the planning team turns each scope item into a detailed work package — a complete set of instructions that tells a craft worker exactly what to do, how to do it, what materials they need, and what safety requirements apply.

What goes into a work package?

A well-prepared work package typically includes:

Job description and scope of work — exactly what is to be done and what the acceptance criteria are
Engineering drawings and specifications — the technical reference materials the worker needs
Bill of materials (BOM) — every part, gasket, bolt, and consumable required for the job
Estimated labor hours by trade — scaffolding, mechanical, electrical, instrumentation, civil, etc.
Permit requirements — confined space entry, hot work, LOTO, etc.
Inspection hold points — where an inspector or engineer must sign off before work proceeds
Safety requirements — PPE, gas monitoring, fall protection, specialized training

The quality of work packages is a direct multiplier on execution efficiency. A complete, accurate work package means a craftsman can walk to the job site, find everything he needs ready, and work without interruption. A poor work package means he stops work, goes looking for answers, and waits — and waiting is what kills turnaround schedules.

Estimating labor hours

Accurate labor hour estimation requires historical data from previous turnarounds, published estimating standards (such as those from AACE International or Richardson’s), and input from experienced craftsmen who have done similar work.

Underestimating hours is a very common mistake. The pressure to present a lean budget leads planning teams to use optimistic numbers — which then blow up during execution when the actual work takes longer than planned. Build in a realistic contingency, typically 10 to 15 percent of total estimated hours, for unplanned discovered work.

Phase 3: Contractor Selection and Bidding (9–12 Months Before Execution)

With the scope defined and work packages in development, the facility begins the process of selecting the contractors who will execute the work.

Types of contractors needed in a turnaround

Most major turnarounds require multiple specialist contractors working in parallel:

Mechanical contractors — pipe fitting, valve repair, heat exchanger bundle pulling, equipment overhaul
Scaffolding contractors — erecting and dismantling access scaffolding across the entire unit
Electrical and instrumentation contractors — motor overhauls, cable work, instrument calibration and replacement
Insulation contractors — removing insulation to access equipment, then reinstalling after work is done
NDT (Non-Destructive Testing) contractors — radiography, ultrasonic testing, eddy current inspection
Cleaning contractors — hydroblasting, chemical cleaning, vessel cleaning
Civil contractors — structural work, foundation repairs, concrete work

How to select the right contractors

Contractor selection should be based on far more than price. A bid that comes in 15 percent cheaper than the competition but relies on an undertrained workforce, poor safety record, or inadequate supervision will cost far more in the end.

Key selection criteria include:

Safety record — Total Recordable Incident Rate (TRIR) and Lost Time Incident Rate (LTIR) over the past three years
Relevant turnaround experience — has this contractor worked on similar equipment in your industry?
Workforce capacity — can they actually staff the peak workforce numbers your schedule requires?
Supervision ratio — what is their ratio of foremen and superintendents to craft workers?
Pre-qualification status — many facilities maintain a pre-qualified contractor database; only pre-qualified firms are allowed to bid

Negotiate contract terms that incentivize schedule and quality performance — not just lowest cost. Incentive/disincentive clauses tied to schedule milestones are widely used in the industry.

Phase 4: Scheduling (6–9 Months Before Execution)

The schedule is the master document that coordinates every element of the turnaround. It tells every contractor, every trade, and every piece of the organization what needs to happen, in what order, and by when.

Critical Path Method (CPM)

Most professional turnaround schedulers use Critical Path Method (CPM) scheduling, typically in software like Primavera P6 or Microsoft Project. CPM identifies the sequence of tasks that determines the minimum possible duration of the turnaround — this sequence is called the critical path.

Any delay on a critical path activity delays the entire turnaround. Activities off the critical path have “float” — meaning they can slip by a day or two without affecting the overall finish date. Understanding the critical path is essential for making real-time decisions during execution.

What a good schedule includes

Every work package broken down into individual activities
Logic ties between activities (e.g., “scaffold must be erected before insulation removal can start”)
Resource loading — the number of workers of each trade required on each day
Equipment and crane availability windows
Inspection hold points and regulatory inspection activities
Pre-startup testing and commissioning activities
A resource-leveled S-curve showing the planned workforce profile across the execution period

Schedule risk and float

Never build a schedule with zero float. Turnarounds always encounter unexpected conditions — a vessel that is more corroded than expected, a flange that won’t seal, a part that doesn’t fit. Build deliberate schedule float into the plan, particularly around the critical path.

A common practice is to build a separate “what if” schedule that models the impact of specific delays — a two-day slip on the main fractionator overhead system, for example — so the team already knows what acceleration options exist before the problem happens.

Phase 5: Pre-Turnaround Execution Preparation (1–3 Months Before Execution)

In the final months before the plant stops, the planning team shifts from building plans to making sure everything is ready to execute those plans.

Material management and kitting

All materials identified in work packages should be ordered, received, inspected, and kitted — organized into bins or cages by job — before execution begins. Walking to the warehouse three times a day to find missing parts is one of the most common and most avoidable sources of lost productivity.

A dedicated materials manager and warehouse team are essential for any major turnaround.

Pre-turnaround walkdowns

The planning team, contractors, and operations representatives physically walk every job site together, confirming that access is feasible, the scope is correctly understood, and any pre-work that can be done while the plant is still running has been completed. These walkdowns are one of the highest-value activities in the planning process.

Safety preparation

Contractor induction programs are finalized and begin for incoming workers
Permit-to-work (PTW) templates are prepared for every job
Emergency response plans are updated to reflect the elevated workforce numbers and unusual work activities
Safety leadership expectations are communicated to all contractors
Toolbox talk schedule is established

Logistics and site setup

Turnarounds create a miniature city on the plant site. Contractor trailers, tool cribs, material laydown areas, welfare facilities (restrooms, break areas), equipment staging areas, and crane positions all need to be planned and set up before execution begins. Poor site logistics is a significant source of lost productivity during execution.

Phase 6: Execution

The plant shuts down. The work begins.

Execution is where months of planning are tested in real time. No plan survives contact with reality perfectly, but the depth of the planning work determines how well the team can adapt.

Daily coordination meetings

Most turnarounds run two coordination meetings per day:

Morning lookback — review yesterday’s progress against plan, identify slippage, agree on corrective actions
Afternoon lookahead — confirm tomorrow’s work plan, verify materials and permits are ready, identify any emerging issues

These meetings should be brief, focused, and decision-oriented. They are not status update sessions — they are the operational heartbeat of the turnaround.

Scope change management

During execution, additional work is almost always discovered once equipment is opened. A vessel that looked acceptable in the inspection records may have unexpected corrosion. A heat exchanger bundle may need replacement rather than cleaning.

Every discovered scope item must go through a formal change management process:

The field engineer documents the finding and estimates the additional hours and cost
The turnaround manager and client representative review and approve or defer the work
The scheduler updates the plan to reflect the approved change

Undisciplined scope growth during execution is one of the leading causes of turnaround overruns.

Managing the critical path

The turnaround manager and scheduler must monitor the critical path relentlessly. When a critical activity falls behind, options include:

Adding craft resources to accelerate the work
Working extended shifts or 24-hour operations on critical jobs
Re-sequencing non-critical activities to free up resources
Accepting reduced scope on lower-priority items

Every major decision during execution should be framed in terms of its effect on the critical path.

Phase 7: Startup and Commissioning

Completing the maintenance work is not the same as finishing the turnaround. The plant still needs to be safely and systematically returned to service.

Pre-startup safety review (PSSR)

Before any process fluid is introduced to the plant, a formal Pre-Startup Safety Review is conducted. The PSSR systematically verifies that:

All maintenance work has been completed and signed off
All isolations have been removed and equipment is properly reinstated
Instruments and safety systems are functional and calibrated
Operations procedures have been reviewed and updated
The operating team is prepared and trained

The PSSR is a critical safety step. Rushing through it to save a few hours is a serious risk — startup incidents are among the most dangerous events at industrial facilities.

Systematic startup

Startup typically follows a step-by-step sequence defined by the operations team and process engineers: introducing utilities first, then process streams in a defined order, monitoring every step for leaks, instrument anomalies, and process upsets before proceeding to the next step.

The turnaround team typically remains on site and available during startup to address any issues that arise from the maintenance work.

Phase 8: Post-Turnaround Review and Lessons Learned

The turnaround is not complete until the lessons-learned process is finished. This is the step most organizations skip — and the reason they make the same mistakes again next time.

What to review

Schedule performance — where did the plan match reality? Where did it miss, and why?
Cost performance — where did costs exceed budget? Was it scope growth, poor estimation, or execution inefficiency?
Safety performance — what incidents occurred? What near-misses were reported? What leading indicators looked concerning?
Contractor performance — which contractors delivered? Which fell short?
Planning quality — which work packages were incomplete or inaccurate? Where did rework occur?
Material management — where were parts missing or incorrect?

How to make lessons learned stick

The lessons-learned report is only valuable if it is actually read and acted upon when the next turnaround is being planned. Build a formal process to:

Document specific, actionable findings — not vague observations like “improve communication”
Assign an owner and a due date to every action item
Review the previous lessons-learned report at the start of the next turnaround planning process
Track implementation

The best turnaround organizations treat continuous improvement as a core discipline, not an afterthought.

Turnaround Planning Timeline: Quick Reference

Phase	Timing Before Execution	Key Outputs
Scope development	18–24 months	Scope register, scope freeze
Work package development	12–18 months	Work packages, BOMs, labor estimates
Contractor selection	9–12 months	Contracts awarded
Scheduling	6–9 months	Baseline CPM schedule, resource plan
Pre-execution preparation	1–3 months	Kitted materials, safety inductions, site setup
Execution	0 (the event)	Completed work, daily coordination
Startup	Post-execution	Commissioning, PSSR, return to service
Post-turnaround review	1–4 weeks post-startup	Lessons-learned report, action register

Frequently Asked Questions

What is the most common cause of turnaround overruns? Poor scope management — either an inadequately defined scope at the start, or uncontrolled scope growth during execution. Budget and schedule overruns are almost always traceable to scope issues first, and execution problems second.

How many people does it take to plan a turnaround? A major turnaround may have a full-time planning team of 10 to 30 people working for 18 to 24 months before execution. Smaller turnarounds may be managed by 2 to 5 planners. The planning workforce is typically a combination of plant employees and specialist turnaround contractors.

What is a work pack completion rate? Work pack completion rate measures the percentage of work packages that are fully complete — materials kitted, permits prepared, access confirmed — before execution begins. World-class organizations target 90 percent or higher. Low completion rates directly correlate with poor execution performance.

Can turnaround duration be shortened? Yes, but only through better planning — not by working faster during execution. Turnaround duration is compressed by improving parallel work execution (doing more jobs simultaneously), better pre-work preparation, and smarter scheduling. Simply pushing craft workers to work faster increases errors, rework, and safety incidents.

What is a turnaround dashboard? A turnaround dashboard is a real-time visual report — usually updated daily during execution — showing schedule performance, cost performance, safety statistics, scope growth, work pack completion, and other key metrics. It gives leadership a quick read on how the turnaround is tracking without needing to attend detailed coordination meetings.

Final Thoughts

Turnaround planning is a discipline that takes years to master. The best turnaround planners combine deep technical knowledge of the equipment with project management expertise, commercial awareness, and the ability to coordinate dozens of organizations toward a single goal.

If you are embarking on your first turnaround — or trying to improve on the last one — the most important investment you can make is in the quality and completeness of your planning process. The execution phase is where the money is spent, but the planning phase is where the outcome is determined.

Looking for experienced turnaround planners, schedulers, or specialist contractors to support your next event? Browse our directory to find vetted professionals in your industry and region.