Visual Inspection — Gladstone

TL;DR: A drone inspection survey in Gladstone puts a high-resolution UAV against the region's hardest-to-reach assets — Boyne Smelters' potline structures, the QAL and Yarwun calciner stacks, Curtis Island LNG flare towers, and the RG Tanna ship loaders — capturing defect-grade imagery without scaffold, EWPs or rope access. ISS flies CASA-certified missions under a Remote Operator Certificate, resolving cracks, corrosion and coating breakdown to 1-3 mm/pixel while the plant keeps running. This page covers the service, the local assets that suit it, our method and kit, the standards, and what it costs.

Key takeaways

• A drone inspection survey in Gladstone removes people from height on the region's tallest and most corrosive assets — alumina calciner stacks at QAL and Yarwun, the Boyne Smelters fume stacks, Curtis Island flare towers and the port's ship loaders — typically cutting inspection time 60-80% and eliminating the highest-risk access tasks under the WHS Regulations 2011.
• ISS captures imagery at 1-3 mm/pixel ground sampling distance (GSD), resolving hairline cracking, weld-toe defects and salt-driven coating breakdown to the standard expected of a hands-on close visual inspection under AS 4100 and AS 3788.
• Gladstone's marine setting — salt aerosol off Port Curtis, cyclone exposure and high humidity — accelerates structural deterioration, so condition imagery here needs to be repeatable and georeferenced to within 20-50 mm for year-on-year comparison.
• All flying is regulated by CASA under CASR Part 101; ISS operates under a Remote Operator Certificate (ReOC) with licensed RePL pilots, registered aircraft and aviation-endorsed public liability cover, and manages port and plant airspace coordination on your behalf.
• A single drone sortie typically runs $2,000-$6,000 per asset — a fraction of a rope-access campaign on a 60 m stack — with the payback usually landing on the first inspection, before any defect is found.

Drone inspection survey for Gladstone's heavy industry

Gladstone holds the most concentrated cluster of heavy industry on Australia's east coast: three LNG trains on Curtis Island, the country's largest aluminium smelter at Boyne Island, two world-scale alumina refineries, a cement works, and Queensland's largest multi-commodity port. These are tall, hot, corrosive, continuously operating assets — exactly the conditions where conventional access is slowest and most dangerous, and exactly where a drone inspection survey earns its place.

The defining local factor is the coastal environment. Salt aerosol off Port Curtis, summer humidity and cyclone-season loading drive corrosion and coating failure faster than any inland site, which means structural condition cannot wait for convenient shutdown windows to be checked. A UAV reaches a calciner stack liner, a conveyor gantry node or a wharf headstock in minutes, flies a repeatable path, and brings the inspector a sharper view than the naked eye from a cherry picker — without standing the plant down or building a scaffold tower in a live process area.

Visual inspection sits within UAV surveying alongside photogrammetry and volumetrics, but the goal here is different: this is about seeing detail — cracks, corrosion, coating breakdown, deformation, missing fasteners, refractory hot spots — not measuring bulk geometry. The drone is the remote-sensing tool; the engineering judgement stays with a competent person who classifies what the imagery shows against the relevant standard.

Key point: In Gladstone the survey work is rarely greenfield. These are mature facilities representing decades of capital, where the question is condition, not set-out. A drone inspection survey is the fastest, safest way to answer "what state is this asset in?" on plant that cannot stop.

Local assets that suit a drone inspection survey

The Gladstone industrial precinct is almost a catalogue of the asset types where UAV visual inspection delivers most. The table below maps the major local operations to the inspection work ISS flies.

Beyond the immediate precinct, the Bowen Basin coal mines that feed Gladstone through the Blackwater and Moura rail systems — BMA's Blackwater and Goonyella operations, Anglo American's Callide and Kestrel — generate the same class of work: conveyor gantries, transfer towers, headframes and tailings storage facility (TSF) embankments where a single drone sortie covers what a rope crew could not reach in a shift. ISS uses the same drone inspection workflow across all of them.

The most common Gladstone use cases are corrosion and coating surveys on marine and stack steelwork, fatigue-crack screening at conveyor truss nodes, refractory and lagging hot-spot detection on stacks and ducting with a thermal payload, and post-event structural checks after cyclone-season weather.

Method and equipment

ISS follows a structured workflow refined across mining, processing, ports and infrastructure. A typical single-asset inspection — a stack, a ship loader, a transfer tower — is half a day on site plus one to three days of review and reporting, and for most assets it is done while the plant runs.

Scoping and CASR Part 101 assessment. Before mobilising we confirm the defects of interest, the required GSD, and whether georeferenced geometry is needed. A JSA and airspace assessment cover the live-plant exclusion zone and any controlled-airspace issues — relevant in Gladstone given Gladstone Airport, the Curtis Island helicopter movements and port operations.

Ground control (where required). If defects must be located on a 3D model or compared between inspections, ISS sets ground control with Leica or Trimble GNSS and total station equipment — the same instrumentation behind our engineering and control network work — tying defect positions to MGA2020/AHD for year-on-year monitoring.

Flight, capture and on-site QA. The inspection is flown as controlled passes at a fixed 3-10 m stand-off to hold a consistent GSD, using automated structure-following missions on complex geometry. The crew reviews imagery for focus, exposure and coverage against the asset map before demobilising, so a missed face is re-flown in minutes rather than triggering a return mobilisation.

Equipment. ISS flies high-stability multirotor platforms carrying mechanical-shutter RGB sensors in the 20-45 MP class — at a 5 m stand-off these resolve roughly 1-1.5 mm/pixel. For assets where stand-off cannot be reduced (energised switchyards, hot LNG flare structures, restricted exclusion zones) a long-range optical zoom captures detail from a safe distance, and a radiometric thermal payload adds anomaly detection for overheating bearings, blocked or wet refractory, lagging defects and electrical hot spots. Imagery is processed into a tagged library, per-face orthomosaics or a textured 3D model, with point clouds exported to LAS/LAZ/E57 when paired with laser scanning.

Key point: Stand-off distance, not megapixels, sets the achievable detail. A 45 MP sensor flown at 15 m resolves less than a 24 MP sensor flown at 4 m. The skill in a Gladstone drone inspection survey is flying close and steady enough, safely, around live and marine structures to capture the GSD the defect actually requires.

Standards and accuracy

Two kinds of accuracy matter: how small a defect the imagery resolves, and — where geometry is captured — how precisely a defect can be located.

The inspection itself is conducted against the standard relevant to the asset — AS 4100 for structural steel, AS 3788 for in-service pressure equipment external condition, AS 1418 and AS 2550 for cranes and ship-loader runways, and dam-safety guidelines such as ANCOLD for TSF embankments on the feeder coal mines. CASA airspace and operational compliance is governed by CASR Part 101 and the associated Manual of Standards. ISS records the standard applied, the inspector's competency and a measurement-confidence statement with every report.

⚠️ Watch out: A drone inspection does not by itself satisfy every mandated regime. Some pressure-equipment and crane standards still require hands-on or NDT inspection at defined intervals — relevant on LNG vessels and smelter cranes. Used well, a drone survey extends the interval between intrusive inspections and targets them; it does not blindly replace them. ISS confirms the regime that applies to your asset during scoping.

Why ISS for drone inspection in Gladstone

ISS is an independent industrial surveying firm — not tied to any aircraft brand or maintenance contractor — so the inspection serves your asset, not an upstream agenda. We mobilise survey teams directly to Gladstone from our Queensland operations and understand the local market: alumina refineries, aluminium smelters, coal terminals and LNG plants demand industrial specialists, not generalists who normally fly residential and commercial work.

Three things matter most to Gladstone operators. First, shutdown timing — we coordinate inspections around planned outages so condition data is captured fast, scoping the shutdown before it starts and verifying work after it. Second, integrated capability — the same team that flies the UAV and aerial surveys runs our mechanical and engineering survey work, so when a drone inspection finds something that needs measuring we bring a total station, laser scanner or photogrammetric capability to bear without re-engaging a new contractor. Third, compliance and access — we hold the Remote Operator Certificate, manage all CASR Part 101 airspace coordination including port and aerodrome proximity, and our pilots carry the inductions, working-at-heights, confined-space and port security clearances that major Gladstone facilities require.

For ongoing condition monitoring across multiple Gladstone assets, ISS offers annual service agreements with priority scheduling and a dedicated team — so each repeat inspection compares against an established baseline and deterioration is measured, not guessed. For the full regional picture, see our Gladstone industrial survey hub.

Frequently asked questions

Can a drone inspection be done while a Gladstone plant is running?

Usually, yes. The capture is non-contact and most live assets — smelter potline structures, port ship loaders, refinery conveyor gantries — can be inspected without standing down production, provided an exclusion zone is maintained around people and operating plant. Energised switchyards, hot LNG flare structures and very hot stacks are flown from a safe stand-off using an optical zoom or thermal payload.

How does ISS handle Gladstone's coastal corrosion and weather?

Salt aerosol and humidity make corrosion and coating breakdown the dominant defects on Gladstone marine and stack steelwork, so we capture at the finer end of our GSD range and georeference imagery to 20-50 mm so coating loss and section thinning can be tracked year on year. We schedule flights for calmer morning windows, plan around cyclone-season weather, and offer rapid post-event structural checks after severe weather.

Does ISS have the approvals to fly at the Port of Gladstone and on Curtis Island?

Yes. ISS operates under a current CASA Remote Operator Certificate with licensed RePL pilots and registered aircraft, and we manage all CASR Part 101 airspace coordination, including Gladstone Airport proximity, port operations and Curtis Island movements. Our crews hold port security clearances and the site-specific inductions required at major Gladstone facilities. You provide site access; we manage the aviation compliance.

What does a drone inspection survey cost in Gladstone, and what do we receive?

Most single-asset inspections run $2,000-$6,000 depending on height, complexity and exclusion-zone requirements, with thermal capture and georeferenced 3D models adding to that. You receive geotagged imagery, a defect register with severity ratings and recommended actions, and — where required — per-face orthomosaics, a 3D model or a thermal report, typically within three to five business days. Against a rope-access campaign on a major stack that can exceed $30,000, the payback usually lands on the first inspection.

Request a quote

If access, height or downtime is making structural and asset inspections at your Gladstone operation slow, expensive or hazardous, a drone inspection survey is very likely the safer and cheaper path. Tell us the asset, its location in the precinct and the defects you care about, and ISS will scope a fixed-price drone inspection survey, recommend the right payload and deliverables, and manage every part of the CASA compliance.

Call us on 0407 057 015 to speak with a surveyor who knows Gladstone's industrial landscape, or explore the Gladstone survey hub and our visual inspection service. We are CASA-certified and operate across Central Queensland.