Turnaround Inspection Drone Support Singapore — Faster, Safer Refinery Shutdowns

What Is a Refinery Turnaround?

A turnaround — a TAR, and also called a shutdown or major outage — is a planned event in which a refinery or petrochemical unit is deliberately taken offline so that equipment can be opened up, cleaned, inspected, repaired and returned to service. Unlike routine running maintenance, a turnaround is the only window in which pressure vessels, columns, reactors and fired heaters can be entered internally, and it is scoped years in advance around statutory inspection intervals, catalyst change-outs and known reliability issues.

The defining characteristic of a turnaround is that it is intensely time-critical. Every day the unit is down represents lost production, and a TAR concentrates thousands of discrete work items into a fixed outage window measured in weeks. Because so much of that work is sequenced — a vessel must be isolated, drained, cleaned, inspected and cleared before repair can start and re-assembly can follow — the tasks that sit on the critical path determine the length of the entire event. Inspection is one of those critical-path activities, and it is the one where remote technology has the greatest schedule impact.

This page covers how drone and robotic inspection integrate into a turnaround as one coordinated package. For the broader shutdown scope see our plant shutdown inspection service, and for sector context our oil & gas and refinery drone inspection pages.

Why Inspection Speed Sits on the Critical Path

The traditional way to inspect turnaround assets is access-heavy and slow. Internal inspection of a tall column or a large reactor conventionally requires full internal scaffolding or staging to be erected before an inspector can even reach the shell, trays and internals — and that scaffold has to come down again before the vessel can be boxed up. Confined-space man-entry brings its own overhead of permits, gas testing, standby watch, rescue cover and strict entry-time limits. External work at height on flare stacks, structures and pipe racks adds rope access and mobile platforms. All of this is time and money spent before and around the inspection itself.

Because these access operations sit directly in front of the inspection on the schedule, they lengthen the critical path. A vessel cannot be released back to the repair teams until it has been inspected, and it cannot be inspected until access is built. Compressing or removing that access step is therefore one of the highest-leverage moves available in turnaround planning — and it is exactly what remote inspection does.

Drones and robotic crawlers inspect internal and external assets far faster and without man-entry or full scaffold. A caged inspection drone can be flying inside a column within minutes of it being gas-tested safe, capturing complete visual coverage of the shell and internals in a fraction of the time a scaffold-and-entry campaign would take. The effect is a shorter inspection leg, less scaffolding cost, and materially reduced safety exposure across the outage.

What We Deploy During a Turnaround

A turnaround is not a single inspection task — it is dozens of them across very different assets, all competing for the same outage window. We bring a multi-capability inspection package so that internal, external and integrity work is coordinated under one vendor rather than split across several access crews.

Delivering these as one coordinated package — rather than mobilising separate scaffold, rope-access and NDT crews for each asset — is what keeps the inspection sequence tight and predictable through the outage.

How It Integrates With the Turnaround Plan

Remote inspection only delivers schedule value if it is planned into the outage rather than bolted on. We work to the turnaround sequence from the start:

• Pre-TAR risk-based scoping — before the outage we review the confirmed worklist and the order in which vessels and equipment will be opened, and map our inspection package against it, prioritising the assets that gate the critical path.
• Mobilise during the outage window — we deploy into the plant on the shutdown schedule, ready to inspect each asset the moment it is isolated, cleaned and gas-tested safe.
• Rapid data capture — drones and crawlers capture complete internal and external coverage in a fraction of the access time, keeping the vessel moving through its sequence.
• Same-day findings — inspection results reach the reliability and inspection team the same day, so repair decisions and further NDT are never held up waiting for data.
• Close-out data pack — a consolidated, traceable record of every asset inspected is delivered as the unit is prepared for re-commissioning, supporting the integrity file and the next inspection interval.

Feeding findings back the same day is the point where remote inspection pays off most: on a turnaround, a decision that waits a day is downtime that cannot be recovered.

An Honest View: We Integrate, Not Replace

Remote inspection is powerful, but it is not a substitute for the whole integrity effort, and we are direct about where its limits are. Drones and robotic crawlers accelerate and de-risk inspection and eliminate many confined-space entries — but code-required hands-on non-destructive testing and physical repairs are still performed by qualified technicians.

Ultrasonic thickness at defined grids, magnetic particle and dye-penetrant examination on welds, tank floor testing and the repairs that follow all remain hands-on activities. What remote inspection changes is the screening: it lets the whole asset be assessed quickly, so hands-on NDT and repair effort is concentrated exactly where the screening shows it is needed, instead of building access everywhere on the chance of finding something. In that role, drone and robotic inspection integrates with — and sharpens — the plant's existing inspection regime rather than replacing it.

The inspection is carried out with reference to the recognised in-service integrity codes — API 510 for pressure vessels, API 570 for piping and API 653 for storage tanks, supported by API RP 572 and API RP 575 inspection practice, ASME Section V for NDE methods, and the WSH (Confined Spaces) Regulations governing any entry. Remote data is captured and reported to support assessment under these codes, with the competent inspection authority making the disposition.

What We Cover in a Turnaround

Our turnaround package spans the four asset groups where inspection most often gates the schedule.

Why Choose SG Drone Inspections

Turnarounds are unforgiving of delay and coordination failure. We are built to slot into that environment as a single, fast, integrated inspection partner.

For the full range of plant assets we cover, see our industrial drone inspection service.

Frequently Asked Questions