Outage Surveys — Hobart

TL;DR: A shutdown survey in Hobart is precision measurement delivered inside the fixed window when a Tasmanian smelter, mine concentrator or port asset is taken offline for maintenance. With the Nyrstar Hobart zinc smelter, Rio Tinto's Bell Bay aluminium potlines and the west-coast mines all running tight annual and multi-year outages, every hour offline costs real money — so Industrial Spatial Solutions plans the outage survey to the hour, executes to sub-millimetre tolerances, and keeps measurement off your critical path.

Key takeaways

• A shutdown survey Hobart operators rely on is scoped to a specific, time-bound window — a roaster or acid-plant overhaul at Nyrstar, a potline or pot-tending crane outage at Bell Bay, a Rosebery mill reline — where the asset earns nothing until it restarts.
• ISS achieves ±0.3–1.0 mm alignment, ±0.02–0.05 mm coaxiality with a FARO laser tracker, and 2–6 mm at 50 m laser-scan accuracy using Leica MS60 MultiStation, TS16 total stations and RTC360 scanners, all calibrated to ISO 17025.
• Bass Strait freight is the Tasmanian variable: specialist trackers and scanners must be planned across the strait with real lead time, so booking 4–6 weeks before the outage date is non-negotiable here, not optional.
• Tasmania's heritage plant — Nyrstar has run since 1917, Bell Bay since 1955 — almost always lacks complete as-built documentation, so comprehensive scanning during the outage doubles as the design basis for the next one.
• Work is referenced to GDA2020/AHD on ICSM specifications and aligns with Mineral Resources Tasmania and the Work Health and Safety Act 2012 (Tas), with crane and structural results assessed against AS 1418 and AS 4100.

The shutdown survey in Hobart and Tasmania

An outage survey is the dimensional control, alignment and as-built measurement work carried out while an industrial asset is shut down for a defined maintenance window. In Tasmania the term covers a generating-unit-style outage on a smelter process train, a furnace or roaster overhaul, and a mill reline or crusher change-out at a west-coast mine — anywhere the line is deliberately stopped and has to come back within tolerance.

What makes Hobart distinct is not the survey discipline but the operating context. Tasmania's industrial value is concentrated in a handful of mature, tolerance-critical assets — the Lutana zinc smelter on the Derwent, the Bell Bay aluminium and ferro-alloy plants on the Tamar, and the underground and magnetite operations on the west coast — and almost every one of them is coordinated, crewed and supplied through Hobart or the northern ports. A shutdown survey here is therefore an island logistics exercise as much as a measurement one: the window is fixed, the kit may have to cross Bass Strait, and the weather can close an access road or a flight before the crew arrives.

Key point: A shutdown survey Hobart industry can depend on is engineered around two constraints at once — the outage clock and the strait. A method that is more accurate but two hours slower can blow the window, and a tracker that has not been freighted in time is useless no matter how accurate it is. ISS plans for both before the first day of the outage.

Where outage surveys apply across Tasmania

The same five-phase outage protocol applies at every site, but the equipment and the survey-critical activities change with the plant. The table maps the principal Tasmanian outage workloads.

Smelter outages

The Nyrstar cell house, roasters and sulphuric acid plant contain rotating and process equipment that must be aligned during overhaul to protect current efficiency and throughput, while the corrosive, humid cell-house environment drives repeat crane-runway survey. At Bell Bay the potlines, pot-tending cranes and anode-handling equipment all need alignment and fit-check inside the narrow shutdowns these continuous, high-temperature plants allow. The defining feature of both is age — a century at Lutana, seventy years at Bell Bay — so scanning during the outage captures conditions that no drawing set records.

Mineral-processing shutdowns

At Rosebery, Renison and the Savage River concentrator the mill reline window is short and unforgiving: girth-gear and pinion alignment, trunnion and bearing checks, and conveyor and crusher work all sit on the critical path. A pre-outage fit-check scan of a replacement mill section or a Port Latta ship-loader module confirms it will land before the crane is committed.

Method and equipment for Tasmanian outages

Outage survey equipment has to be accurate, portable, fast to deploy and tolerant of heat, dust and vibration — and in Tasmania it has to survive the freight. ISS selects the instrument to the task and the schedule, then plans the kit list around Bass Strait lead times.

• Leica TS16 robotic total station and MS60 MultiStation — ±1 mm + 1.5 ppm distance, 1" angle. The workhorses for control, alignment and set-out. The MS60 combines angle, distance and scanning in one instrument, which matters when setup time is the constraint inside a smelter shutdown, and Automatic Target Recognition keeps the surveyor clear of active lifts.
• Leica RTC360 3D laser scanner — 2–6 mm at 50 m, full setup under two minutes. The fastest route to comprehensive as-built capture of cell-house structure, potline steel, mill internals and clearance envelopes, and the method of choice for fit-check of replacement modules and clash detection on tie-in work.
• FARO laser tracker — ±0.015–0.025 mm at working range. The instrument for coaxiality, concentricity and machined-face checks on furnace shells, large bearing bores and drive trains where a total station's accuracy is insufficient.
• Reflectorless and portable control — reaches hot and inaccessible points without target placement, and quickly recovered control targets serve repeated measurement cycles across a multi-day outage.

A stable 3D control network is set out around the work area before the outage starts, with reference points positioned to survive scaffolding, crane movements and demolition. Establishing control before the area is congested is the single biggest time-saver during the outage itself — and on a heritage smelter floor with a century of accreted steelwork, it is also the hardest, which is exactly why it is done early.

Key point: Scanning and total-station work are complementary on an outage. The scanner captures the whole condition for as-built and fit-check; the total station and tracker deliver the sub-millimetre numbers the mechanical team signs against. Using one where the other belongs either wastes window time or undershoots the tolerance.

Accuracy and standards

Outage survey accuracy is matched to the engineering tolerance of the task and verified against the relevant standard.

All instruments are calibrated to ISO 17025 and measurements are traceable to national standards, with uncertainty statements supplied alongside alignment deliverables. Deliverables are referenced to GDA2020 and the AHD (Tasmania) vertical datum on ICSM specifications so they integrate cleanly with client engineering and GIS systems. Crane and structural results are assessed against AS 1418 for cranes and runways and AS 4100 for steel structures, or OEM tolerances where they are tighter. Mine-site shutdown work sits within the Mineral Resources Development Act 1995 (Tas) administered by Mineral Resources Tasmania, and all field crews work to the Work Health and Safety Act 2012 (Tas) with current confined-space, working-at-heights and site-specific certifications.

Why ISS for shutdown surveys in Hobart

Tasmania's outage market is small but technically demanding, and it punishes generalist providers. The zinc smelter, the Bell Bay plants and the west-coast mills need crews who understand smelter tolerances, corrosive continuous-operation environments and the narrow maintenance windows these assets allow — and who can get the right instrument across Bass Strait in time to use it.

• The window is the project constraint. ISS locks scope 4–6 weeks out, establishes control before the area is congested, and schedules attendance against the work list so measurement is ready the moment an area is — never before, never after. We carry redundant instrumentation so a single equipment failure never stops the line.
• Bass Strait–aware logistics. Specialist trackers and scanners are freighted across the strait with the lead time that requires. We do not promise overnight mobilisation of kit that has to cross water, and we say so up front rather than discovering it on day one of your outage.
• Heritage-plant experience. We have worked in smelting and metals-processing environments — electrolytic cell houses, roasters and acid plants, aluminium potlines and ferro-alloy furnaces — and we know that century-old drawings cannot be trusted, which is why scanning is built into the scope rather than bolted on.
• Independent of any OEM. We align and verify equipment from any manufacturer using consistent methodology, and feed verified geometry straight into recommissioning sign-off.
• Critical results reported on the spot. Anything a lift or a coupling decision depends on is reported verbally and in writing as it is measured. The formal report — issued within 5–10 business days — never holds up the restart.

This is the same outage discipline described on our outage survey service page, delivered with the island logistics and heritage-plant knowledge set out across our Hobart and Tasmania surveying work.

Frequently asked questions

How far ahead do we need to book a shutdown survey in Hobart?

Four to six weeks before the outage date, and in Tasmania that lead time is firmer than on the mainland. It allows scope definition, a pre-outage site visit, safety documentation, crew scheduling and — critically — Bass Strait freight of any specialist tracker or scanner. Late bookings risk unavailable crews, rushed methodology, freight that misses the window, and lost outage hours.

Can the outage survey be done without extending our window?

Yes — that is the entire point. Well-planned shutdown survey work runs parallel to mechanical activity and stays off the critical path: the surveyor measures when an area is ready and reports before the next activity needs the result. Overruns come from late scope and missing control, both of which planning eliminates. The Tasmanian addition is freight planning, which we treat as part of the schedule, not an afterthought.

What accuracy do you achieve during a smelter or mill outage?

Alignment work is typically ±0.3–1.0 mm with total station and MultiStation, and ±0.02–0.05 mm for coaxiality and concentricity using a laser tracker — the range that covers Nyrstar roaster trains, Bell Bay potline equipment and Rosebery girth-gear and pinion sets. As-built scanning is 2–6 mm at 50 m. All instruments are ISO 17025 calibrated, with uncertainty statements on alignment deliverables.

Do you have experience with Tasmania's zinc and aluminium smelters?

Yes. Our surveyors have worked the survey requirements specific to electrolytic cell houses, roasters and acid plants, aluminium potlines and ferro-alloy furnaces — cell-house crane runways, furnace and vessel geometry, rotating-equipment alignment and heritage-structure deformation monitoring — within the safety constraints of high-temperature continuous operations and the narrow shutdown windows these plants allow.

Request a quote

If you have a smelter overhaul, potline shutdown, furnace reline or mill outage coming up in Hobart or anywhere in Tasmania, talk to ISS early — the difference between a survey program that protects your window and one that derails it is planning, credentials, freight lead time and the right instrument for each task.

Call 0407 057 015 to scope your shutdown survey and request a fixed-price quotation, or request a quote online. For operators running multiple Tasmanian outages a year, we offer annual service agreements with priority scheduling and dedicated team allocation.

Industrial Spatial Solutions — Tasmania-wide, smelter-capable, outage-window ready.