Engineering & Construction

Plant Construction, Maintenance, Shutdown & Turnaround Services

Plant construction and maintenance, plus planned shutdown and turnaround execution.

Shutdowns and turnarounds are measured in hours, not days. We plan the work package by package, mobilise the trades and equipment needed to run parallel fronts, and hand the plant back on schedule — with the same teams available for routine maintenance between events.

Scope of Work

Greenfield and brownfield plant construction
Turnaround planning, work-scope freezing and critical-path scheduling
Shutdown execution: blinding, isolation, cleaning and reinstatement
Static equipment overhaul: heat exchangers, columns, vessels and furnaces
Rotating equipment maintenance and alignment
Routine and shutdown-window mechanical integrity inspection support

What is Plant Construction, Maintenance, Shutdown & Turnaround Services?

A shutdown or turnaround is a planned period during which a process unit is taken offline so that work which cannot be performed while it is running — internal inspection, equipment overhaul, tie-ins and catalyst or lining replacement — can be completed. Turnaround services cover the planning, resourcing and execution of that window, together with the routine plant construction and maintenance carried out between events.

Why it matters

A turnaround is the single most expensive maintenance event an operator undertakes, and most of that cost is not the work — it is the production forgone while the unit is down. A day saved is a day of output recovered; a day lost is unrecoverable. That asymmetry is why turnarounds are planned in far more detail than their duration would suggest, and why scope discovered after the unit is opened is so damaging to the schedule.

Who needs this service?

Refineries and petrochemical complexes operating on a fixed turnaround cycle
Gas processing and utilities plants with statutory inspection intervals to meet
Power generation and desalination operators scheduling outages around demand seasons
Manufacturing plants requiring annual or biennial planned maintenance stoppages
Operators whose own maintenance workforce is sized for routine work, not peak turnaround manning
Asset owners commissioning greenfield plant or expanding an existing facility

When to engage this service

A statutory or risk-based inspection interval is falling due on pressure equipment
Unit performance has degraded — fouled exchangers, spent catalyst, failing internals
A tie-in for a new project can only be made with the unit depressurised and isolated
Deferred corrective work has accumulated beyond what run-and-maintain can absorb
A revamp or debottlenecking is being executed inside an existing plant footprint
Peak manning is required for a short window and cannot be met from the site workforce

Industries served

Refining & Petrochemicals
Cyclical turnarounds on crude, reforming, cracking and utilities units, where the critical path usually runs through vessel entry and heat exchanger work.
Power & Desalination
Boiler and turbine outages, condenser cleaning and pipework renewal scheduled outside peak demand.
Manufacturing & Process Plants
Annual stoppages combining preventive maintenance, equipment replacement and line modification.
Mining & Minerals Processing
Wear-part replacement, chute and liner renewal and structural repair in high-abrasion service.
Industrial Utilities
Steam, cooling water and compressed air systems taken down in coordinated windows across a site.
Terminals & Storage
Tank cleaning, internal inspection and floor or roof repair under API 653 driven intervals.

How the work is delivered

Step 1: Scope development and freeze

The work list is built from inspection findings, deferred maintenance, engineering change requests and statutory requirements, then challenged item by item: does this genuinely require the unit to be down? The scope is frozen at an agreed date, after which additions require formal approval — the single most effective control on turnaround duration.

Step 2: Planning and critical path scheduling

Each job is broken into activities with durations, trades, equipment and access requirements, then networked to expose the critical path. Parallel work fronts are designed deliberately, and manning is levelled so that peak demand does not exceed what the site can actually accommodate and permit.

Step 3: Pre-shutdown preparation

Materials, spares and rental equipment are received and staged before the unit comes down. Scaffolding, temporary services and laydown are pre-built where the live plant allows. Work packs — drawings, permits, method statements, isolation lists — are issued to supervisors in advance, not written during the outage.

Step 4: Shutdown, isolation and decontamination

The unit is depressurised, drained, purged and isolated under the operator's permit system, with blinding registers and lock-out tag-out applied and verified. Gas testing precedes any entry or hot work. This phase is short but it gates everything after it, so it is planned as carefully as the mechanical work.

Step 5: Execution across parallel fronts

Mechanical, civil, electrical and specialist trades work simultaneously under coordinated permits, with progress measured against the schedule at shift intervals rather than daily. Discovery work — findings once equipment is opened — is assessed against the critical path before it is authorised, so that its schedule impact is a decision rather than a surprise.

Step 6: Reinstatement, testing and start-up support

Equipment is boxed up against a verified punch list, blinds are removed against the register, systems are pressure tested and leak checked, and instrumentation is loop checked. Teams remain available through start-up to deal with the leaks and trips that typically appear in the first hours of running.

Why clients choose this delivery model

Manning that scales to the window
Turnarounds need several times the routine headcount for a few weeks. Recruiting, mobilising, inducting and accommodating that peak — then releasing it — is a logistics exercise, and it is the part operators are least equipped to run in-house.
All trades from one organisation
Mechanical, civil, electrical, instrumentation, scaffolding, insulation, painting and cleaning under one contract means one interface with the permit office and no idle standby while a second contractor is called out.
Planning that survives contact with the plant
Schedules are built with contingency positioned where discovery work is statistically likely — exchanger bundles, vessel internals, corroded pipework — rather than as an undifferentiated allowance at the end.
Continuity between events
The same teams available for routine maintenance between turnarounds already know the plant layout, the permit regime and the equipment history — which shortens the learning curve when the next outage begins.
Safety performance under compressed schedules
Turnarounds concentrate simultaneous operations, night shifts and unfamiliar crews — the conditions under which incidents cluster. A single safety plan, supervisor stop-work authority and controlled SIMOPS assessment are the counterweight.

Planned turnaround versus reactive breakdown repair

Criterion	Split discipline packages	Single accountable contract
Timing of the outage	Set by the failure, often at peak demand	Chosen around production and market conditions
Spares availability	Ordered after failure, at expedited cost	Staged on site before the unit comes down
Labour cost	Emergency mobilisation at premium rates	Planned mobilisation with levelled manning
Scope of work	Limited to the failure; adjacent defects remain	Bundled so one outage clears the backlog
Production loss	Unbudgeted and open-ended	Forecast, budgeted and bounded by the schedule

Saudi regulations and compliance

HCIS directives for industrial facilities

Industrial facilities within scope of the High Commission for Industrial Security are subject to its safety and security directives, covering matters such as fire protection provision, emergency response arrangements and the vetting and control of contractor personnel entering the plant.

Operator permit-to-work systems

All work inside a live or shut-down process facility runs under the operator's own permit regime: isolation and blinding certificates, confined space entry permits, hot work permits and gas testing. Permit throughput is a genuine schedule constraint and is planned as a resource, not assumed to be unlimited.

Mechanical integrity inspection codes

Inspection intervals and acceptance criteria for pressure equipment are typically set by API 510 for pressure vessels, API 570 for piping and API 653 for storage tanks, often applied through a risk-based inspection programme. These intervals are frequently what determines when a turnaround must occur at all.

Client engineering standards

Major Saudi operators maintain their own engineering standards and construction safety requirements which take precedence over general practice where the contract invokes them. Welding procedures, materials, inspection and safety controls are executed to those documents when they apply.

Waste and environmental handling

Turnarounds generate catalyst, sludge, spent chemicals and contaminated water that fall under Saudi environmental regulation and the oversight of the National Center for Environmental Compliance. Disposal routes and licensed contractors are arranged before the waste is created, since storage on site is usually the binding constraint.

Standards commonly specified

ISO 9001
ISO 14001
ISO 45001
API 510
API 570
API 653
API 580
ASME B31.3
ASME Section VIII
ASME Section IX
ASME PCC-2
AWS D1.1
ASNT SNT-TC-1A

Codes and standards this discipline is routinely held to. The standards applied on any given project are those named in the contract.

Common mistakes to avoid

Allowing the work list to keep growing after the agreed scope freeze date
Planning to a duration decided by the production department before the work content is known
Assuming unlimited permit throughput, so crews are mobilised faster than they can be authorised to work
Leaving long-lead spares and exchanger bundles to be ordered after inspection findings are confirmed
Writing work packs during the outage instead of issuing them to supervisors beforehand
Under-resourcing scaffolding and insulation, which gate mechanical access on almost every front
Treating start-up as the operator's problem and demobilising before the unit is stable
Recording discovery work informally, so its schedule and cost impact cannot be substantiated afterwards

Frequently asked questions

What is the difference between a shutdown and a turnaround?

The terms overlap and are often used interchangeably. In common usage a shutdown is any planned stoppage of a unit, while a turnaround refers to the larger, cyclical event in which the unit is opened for internal inspection and major overhaul. A turnaround is a shutdown; not every shutdown is a turnaround.

How far in advance should turnaround planning begin?

For a major event, preparation typically begins many months ahead, because long-lead procurement, contractor mobilisation and scope challenge all need time. The practical test is not the calendar but the milestones: is the scope frozen, are long-lead items ordered, and are work packs issued? A turnaround that reaches its start date without those complete will absorb the shortfall in duration.

How is discovery work handled without derailing the schedule?

By assessing every finding against the critical path before authorising it. Work that is off the critical path can often be absorbed; work on it cannot, and the choice between extending the outage and deferring the repair belongs to the operator. Recording the finding, its assessment and the decision at the time is what makes the eventual schedule and cost position defensible.

Can you provide the full trade mix, or only mechanical crews?

The full mix: mechanical fitters, welders, riggers, civil trades, electricians, instrument technicians, scaffolders, insulators, painters and industrial cleaning crews, together with the supervision, QA/QC and safety staffing to run them. Trades that are typically subcontracted out — scaffolding and cleaning in particular — sit inside the same organisation and the same safety system.

How is safety managed when hundreds of workers are on site at once?

Through controlled simultaneous operations. Permits in the same area are coordinated so hot work, lifting and confined space entry are not authorised in conflict; every worker is inducted to the site and the specific unit; supervisors hold stop-work authority; and gas testing precedes entry and hot work. Density of people is itself treated as a hazard when planning work fronts.

Do you support start-up after the mechanical work is complete?

Yes. Teams remain on site through reinstatement, leak testing and the initial running period, when flange leaks, instrument faults and trips are most likely to appear. Demobilising at mechanical completion transfers those first-hours problems to an operations team that no longer has the trades to fix them quickly.

What routine maintenance can be done without a shutdown?

A great deal: preventive maintenance on rotating equipment with installed spares, external inspection, insulation and coating repair, on-line cleaning, valve maintenance where isolation allows, and much electrical and instrument work. Moving work out of the outage and into run-and-maintain is one of the most reliable ways to shorten the next turnaround.

How is turnaround performance measured?

Against the frozen scope and baseline duration, with schedule adherence, discovery work as a proportion of total work hours, safety performance, rework, and the stability of the unit after start-up. Finishing early against an inflated baseline is not performance, which is why the baseline itself has to be built from work content rather than expectation.

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