What is a refinery turnaround checklist?
A refinery turnaround checklist is the master list of planning, safety, contracting and execution actions required to take a processing unit offline, complete inspection, maintenance and capital modifications, and return it to stable operation — organised as a countdown from roughly T-12 months to T-0 (shutdown) and through start-up.
The economics justify the paperwork. A turnaround happens every 3–5 years per unit, lasts 20–60 days, and every extra day of shutdown costs the refinery roughly ₹5–15 crore in lost production. Hundreds of workers execute thousands of tasks simultaneously inside a depressured unit, so the difference between a TAR that finishes on day 30 and one that limps to day 45 is almost never welding speed — it is planning that happened, or didn't, in the year before the feed was cut. This checklist reflects the execution discipline HAIL applies as a refinery turnaround contractor working inside live Indian refineries, including the ₹105 crore Coker-B revamp scope at IOCL Barauni.
When should turnaround planning start?
Serious TAR planning starts 12 months before shutdown — some refineries start earlier for mega-turnarounds. The critical milestones: worklist development from T-12, contracting strategy by T-9, detailed planning and pre-fabrication from T-6, scope freeze at T-3, mobilisation from T-1, and shutdown at T-0.
The countdown structure matters because each milestone gates the next. Long-lead materials ordered at T-10 arrive comfortably; the same items ordered at T-4 arrive mid-execution or not at all. A contractor selected at T-9 can plan, pre-fabricate and integrate with the refinery's permit system; one selected at T-2 can only bring bodies.
T-12 to T-9 months — scope development
The inspection department consolidates the worklist: statutory inspection items (API 510 vessels, API 570 piping), reliability-driven repairs, operations complaints, and capital modification requests competing for the window. Every item gets a preliminary estimate and priority. Long-lead procurement starts now — exchanger bundles, column trays, special alloys, large valves.
T-9 to T-6 months — contracting strategy
Decide the packaging: single multi-discipline contractor or multiple specialty contracts, and who owns the schedule interface. Prequalify contractors on live-refinery track record, safety statistics, discipline coverage and workshop capacity. Issue enquiries with a defined worklist so bids are comparable. Award early enough that the contractor participates in planning rather than receiving it.
T-6 to T-3 months — detailed planning & pre-fabrication
Every worklist item becomes a job card: task steps, crew, duration, materials, scaffolding, permits and inspection hold points. The integrated schedule is built and resource-levelled — if the plan needs 900 fitters in week two and the market can supply 600, now is when you find out. Pre-fabrication begins: piping spools, structural modifications, nozzle assemblies fabricated, tested and painted at the contractor's workshop. HAIL runs this through its 33,000 sq.ft. Kalol workshop so that site work during the window is assembly, not fabrication.
T-3 months — scope freeze
The worklist is frozen. Additions after this point go through formal change control with stated schedule and cost impact, signed at a level that feels the pain of a longer shutdown.
T-1 month to T-0 — mobilisation
Mobilisation takes 2–4 weeks: workforce build-up (100–500+ workers per unit), cranes and equipment positioning, scaffolding pre-erection where permitted, temporary facilities, safety inductions, PTW training, confined-space certification and emergency drills. Materials move to staged laydown positions keyed to the schedule. At T-0, operations shut the unit down in sequence, and isolation begins.
Why is scope freeze critical?
Because late scope additions are the single biggest cause of turnaround overruns. An item added after freeze arrives with no materials on order, no planned job card, no crew allowance and no inspection slot — so it consumes float that belonged to the frozen scope and pushes the end date day for day.
Freeze does not mean nothing can change; it means change becomes a deliberate trade. A disciplined change board asks three questions: can it wait for the next opportunity, what does it displace if it enters now, and who accepts the extension cost at ₹5–15 crore per day. Refineries that let the worklist drift into the execution window pay for the same turnaround twice — once in the plan, once in the overrun.
How should contractors be mobilized?
Mobilise 2–4 weeks before shutdown against a written mobilisation plan: manpower ramp-up curve, equipment and crane schedule, temporary facilities, materials staging, and a 100% completion of safety inductions, PTW training and medical screening before the first permit is issued at T-0.
The interface question decides everything downstream. When separate contractors handle mechanical, piping, electrical and painting, no one owns the sequence — scaffolding erected for the mechanical crew blocks the painter; the E&I crew waits on the piping hydrotest. A single contractor self-performing all disciplines — mechanical, piping, structural, E&I, painting and heavy lift — under one PO removes that interface loss. It is the core reason multi-discipline TAR contractors exist.
What safety preparation does a turnaround require?
A TAR multiplies normal site risk: confined-space entries, hot work near hydrocarbon systems, simultaneous lifts, and hundreds of temporary workers. Preparation means a permit-to-work system integrated with the refinery's, a safety officer ratio of about 1:50 workers, JSA per task, and drilled emergency response — all in place before day one.
The safety checklist that must be green before feed-out:
- PTW procedures aligned and joint training completed with refinery operations.
- Confined-space entry protocol: gas testing regime, attendants, rescue equipment and certified entrants.
- Hot-work management: habitats, fire watches, spark containment near live adjacent units.
- Isolation verification: blind list published, every blind numbered, installed and logged.
- Fall-arrest plans for work at height; lifting plans for every critical lift.
- Safety officer coverage at 1:50 during execution, daily toolbox talks scheduled by crew.
- Emergency response drill completed jointly with the refinery before T-0.
This is the regime under which HAIL has maintained zero major incidents inside live IOCL refineries — safety and schedule are the same discipline wearing different badges.
What are the execution phases of a turnaround?
Execution runs in seven broad phases: unit shutdown and isolation; opening and inspection; mechanical repairs; piping modifications and tie-ins; electrical and instrumentation overhaul; painting and box-up with leak testing; then pre-commissioning and start-up support. Discovery work is managed in parallel throughout.
- Shutdown & isolation: operations depressure, drain, steam-out and nitrogen-purge the unit; gas-free certificates issued; blinds installed per the blind list.
- Open & inspect: vessels, columns, exchangers and reactors opened; API 510/570 inspection proceeds; discovery items logged and dispositioned within 24–48 hours.
- Mechanical repairs: weld overlay, patch plates, nozzle replacement, tray and packing replacement, exchanger retubing, catalyst change-out.
- Piping: corroded or modified sections cut out; pre-fabricated spools and new tie-ins installed; field welds completed with NDT (RT/UT/MT/PT), hydrotest and reinstatement; flange joints managed per ASME PCC-1.
- E&I: cable replacement, motor overhaul, switchgear servicing, control valve overhaul, transmitter calibration, loop checks and interlock verification.
- Box-up & leak test: internals reinstated, vessels closed, flanges torqued to specification, blinds removed per list, nitrogen or service-fluid leak test on every opened system, joint punch-list walk-down.
- Start-up support: line charging, equipment commissioning and instrument verification with standby crews for leak rectification through the first 48–72 hours of operation; demobilise only after stable run confirmation.
What are the most common turnaround pitfalls?
Five failures account for most TAR overruns: scope creep after freeze, unbudgeted discovery work, interface loss between multiple contractors, materials arriving late or wrong, and workforce attrition mid-window. All five are planning failures visible months before shutdown — none of them start during execution.
- Scope creep: "while we're in there" items entering without change control. Antidote: a chaired change board and a freeze date that means something.
- Discovery shock: no allowance for what inspection will find. Antidote: a discovery budget, standing crews, stocked repair materials and pre-agreed decision rules.
- Interface loss: trades waiting on each other with no sequence owner. Antidote: one multi-discipline contractor, or a genuinely empowered integration lead.
- Material shortfall: gaskets, studs, valves and specials missing at the workface. Antidote: kitting per job card at laydown before T-0, not warehouse-on-demand.
- Workforce attrition: crews poached or exhausted mid-TAR. Antidote: realistic shift patterns, welfare facilities and retention terms priced into the contract, not squeezed out of it.
The complete refinery turnaround checklist
Use this as the working skeleton for a TAR readiness review — every line should have an owner and a date.
Phase 1 — Scope & strategy (T-12 to T-9)
- Worklist consolidated: statutory inspection, reliability, operations and capital items
- Each item estimated, prioritised and risk-ranked
- Long-lead materials identified and ordered (bundles, trays, alloys, valves)
- Preliminary TAR budget and duration target approved
- Previous turnaround close-out report reviewed for repeat findings
Phase 2 — Contracting (T-9 to T-6)
- Contracting strategy fixed: single multi-discipline vs multiple packages
- Contractors prequalified on live-refinery references and safety statistics
- Enquiries issued against a defined worklist; bids levelled on identical scope
- Contract awarded with schedule incentives and discovery-work rates agreed
- Contractor planning team embedded with refinery TAR team
Phase 3 — Detailed planning & pre-fab (T-6 to T-3)
- Job cards prepared for every worklist item with materials and hold points
- Integrated schedule built, resource-levelled and critical path published
- Piping spools, structural steel and nozzle assemblies pre-fabricated and painted
- Scaffolding, crane and heavy-lift plans engineered
- Blind list drafted; isolation philosophy agreed with operations
- Scope frozen at T-3 — change control active from this date
Phase 4 — Mobilisation (T-1 to T-0)
- Workforce mobilised per ramp-up curve; 100% inductions and PTW training done
- Cranes, welding sets, NDT and hydrotest equipment positioned and certified
- Materials kitted per job card and staged at laydown
- Temporary facilities, lighting and power energised
- Emergency response drill completed jointly with refinery
Phase 5 — Execution (T-0 onwards)
- Unit shutdown, steam-out, purge and gas-free certification complete
- Blinds installed and verified per list
- Daily schedule update, look-ahead and discovery disposition meetings running
- NDT, hydrotest and inspection hold points cleared progressively — not batched at the end
- Box-up, torque records, blind removal verification and leak testing complete
Phase 6 — Start-up & close-out
- Pre-commissioning checks, loop checks and interlock verification signed off
- Standby crews retained through first 48–72 hours of operation
- Punch list closed; demobilisation per plan (1–2 weeks)
- Close-out report issued: cost, schedule, discovery statistics, lessons for the next TAR
Frequently asked questions
How long does a refinery turnaround last?
A refinery turnaround (TAR) typically lasts 20–60 days of execution depending on unit size and scope, preceded by 6–12 months of planning, 2–4 weeks of mobilisation, and followed by 1–2 weeks of demobilisation and punch-list closure. Major capital revamps within a TAR window can extend the total duration.
How often are refinery turnarounds performed?
Most refinery processing units undergo a planned turnaround every 3–5 years, driven by statutory inspection intervals, catalyst life, exchanger fouling and equipment reliability history. The interval is set per unit, so a large refinery is almost always planning or executing a turnaround somewhere on site.
What does a refinery turnaround cost?
Mechanical contractor scope on Indian TARs indicatively ranges from about ₹1 crore for a small unit shutdown to ₹100 crore or more where capital revamps ride the window — as 2026 indicative figures. The bigger number is lost production: every extra day of shutdown costs a refinery roughly ₹5–15 crore.
What is the difference between a turnaround, a shutdown and an outage?
A turnaround (TAR) is a planned major overhaul with capital modifications, typically 30–60 days. A shutdown is a planned maintenance stop without major capital work, typically 7–21 days. An outage is an unplanned emergency stop. Planning rigour, workforce size and cost differ by an order of magnitude across the three.
When should turnaround scope be frozen?
Freeze scope about 3 months before the shutdown (T-3). After freeze, additions go through formal change control with schedule and cost impact stated. Late scope additions are the number-one cause of TAR overruns because they arrive without materials, planning packs or crew allowances behind them.
What is discovery work in a turnaround?
Discovery work is repair scope found only after equipment is opened — corroded nozzles, cracked trays, tube leaks that inspection could not see from outside. Mature TAR plans carry a discovery allowance in budget and schedule, plus standing crews and materials, so findings are absorbed rather than becoming day-for-day slippage.
How is safety managed during a refinery turnaround?
Through a layered system: permit-to-work integrated with the refinery, a safety officer ratio of about 1:50 workers, job safety analysis per task, confined-space entry protocol, hot-work management, fall-arrest plans, daily toolbox talks and emergency drills. HAIL has maintained zero major incidents inside live IOCL refineries.
What can compress a turnaround schedule?
Pre-fabrication of piping spools and structural steel before the window opens, 24/7 shift patterns, a single multi-discipline contractor owning the sequence, rigorous scope freeze, staged materials at laydown, and pre-approved discovery-work decision rules. HAIL pre-fabricates at its 33,000 sq.ft. Vadodara–Kalol workshop to shorten the critical path.
Can capital projects be executed during a turnaround?
Yes — the TAR window is usually the only opportunity for brownfield capital modifications inside an operating refinery: new tie-ins, column internals replacement, exchanger bundle upgrades and piping re-routes. The capital scope must be engineered, procured and pre-fabricated well before shutdown so it rides the window without extending it.
Why use a single multi-discipline contractor for a turnaround?
Because interface loss between separate mechanical, piping, electrical and painting contractors is a leading cause of TAR overrun — nobody owns the sequence. A single contractor self-performing all disciplines under one PO removes waiting between trades. HAIL self-performs mechanical, piping, structural, E&I, painting and heavy lift.
Durations and cost figures in this guide are indicative 2026 industry estimates for planning purposes, not HAIL's quoted prices. Every turnaround is priced against a defined worklist — request a detailed proposal for your unit.