A grab crane, a precast stacker, a pickling crane and a cleanroom crane are four different installation problems. What changes is not the steel, it is what has to be verified before the machine is allowed to run.
A special crane installation takes 2 to 8 weeks depending on type, and the steel is rarely the slow part. What makes it different from installing a standard overhead crane is that four extra things have to be verified before the machine is allowed to run: grab weight against rated capacity, positioning accuracy, corrosion protection, or room cleanliness. Get those wrong and the crane passes its load test and still fails the job it was bought for.
We build grab cranes, precast concrete cranes, pickling and acid-wash cranes and cleanroom cranes, and no two of those installation jobs look alike on site. A 30-ton grab crane in a port is a mechanical commissioning problem. A 2-ton cleanroom crane in a semiconductor fab is a contamination problem that happens to include a crane. The tolerance tables are similar. Everything after them is not.
This guide covers what the scope actually includes, the pre-site checks by type, the geometry tolerances that apply to all of them, the commissioning items that differ, the electrical and load tests, 2026 cost ranges, what goes wrong in the first year, and the handover file. If you are buying a grab bucket or a cleanroom hoist as an upgrade to an existing crane rather than a complete machine, most of it still applies, and we flag the parts that change.
On a standard crane the argument is about who supplies the runway. On a special crane there are four or five such arguments, and each one is more expensive to lose.
The machine is also not just a crane with options. The environment dictates the components, and the components dictate the installation method. A pickling crane delivered with a standard painted control cabinet is not a commissioning problem you can fix on site. Neither is a cleanroom crane delivered with a standard wheel block that sheds metal dust the moment it starts rolling.
| Scope item | Who normally supplies it | Where it goes wrong |
|---|---|---|
| Crane structure, hoist, grab or special attachment | Crane supplier | Grab or lifter chosen from a catalogue before the material bulk density was measured |
| Runway, rails, rail beams and their alignment | Buyer, or crane supplier on full scope | Long-span precast crane: rail span out of tolerance, wheels track the flange and wear it out in a year |
| Environmental protection: sealed enclosures, stainless parts, coatings | Crane supplier | Coating damage during transport touch-up not redone to the same dry film thickness |
| Cleanroom materials: PFPE grease, sealed wheel blocks, stainless fasteners | Crane supplier, agreed in the spec | Standard lithium grease found inside a gearbox after the room is released |
| Power feed, main switch, earthing and bonding | Buyer's electrical contractor | Bonding continuity test never done, so an ESD-rated cleanroom crane is not actually earthed |
| Specialty verification: proof test, particle count, ATEX initial inspection | Crane supplier, or a third-party inspection body | Load test done, particle count or initial Ex inspection not, so the room or the zone cannot be released |
| Operator training and the maintenance schedule by duty class | Crane supplier | A7/A8 grab crane handed over with the same inspection interval as a light workshop crane |
Two items on that list are worth writing into the purchase order as line items rather than assuming: the specialty verification, and the environmentally rated wear parts. Both are cheap at the factory and painful to retrofit.
Ranges below are what we see on our own projects, split into the mechanical job and the commissioning that only a special crane needs. They assume the runway or support structure is ready and the materials are on site.
| Crane type | Typical capacity | Install and commission | What eats the calendar |
|---|---|---|---|
| Grab crane | 5 โ 50 t, A6 โ A8 | 3 โ 6 weeks | Grab commissioning and proof test, 2 โ 3 days, plus handling trials with the real material |
| Precast concrete crane | 10 โ 100 t, span 10 โ 40 m | 4 โ 8 weeks | Multi-hoist synchronisation and positioning calibration, 3 โ 5 days, repeated with a real panel |
| Pickling / acid-wash crane | 5 โ 30 t, IP55 and above | 3 โ 5 weeks | Coating repair and cure, plus panel pressurisation checks in an area you would rather not work in |
| Cleanroom crane | 0.5 โ 10 t, ISO Class 5 โ 8 | 2 โ 4 weeks | Cleaning, wipe-down and the particle count test, which needs the room empty and stable |
| Hazardous-area (Ex) crane | 2 โ 50 t, Zone 1 or 2 | 4 โ 7 weeks | Component availability and the initial Ex inspection before first energising |
The single most common cause of a late handover is not the crane. It is a specialty test nobody owned. On one port project the crane was mechanically finished for eleven days while a certified proof-test load was being organised.
Every special crane needs a site survey. The items differ enough by type that they are worth a table of their own, because these are the checks that turn into change orders if they are done after delivery.
| Crane type | Measure or confirm before delivery | Why it matters |
|---|---|---|
| Grab crane | Material bulk density, grab volume, hoist rope system and number of falls, duty class | Loaded grab weight is grab dead weight plus material. Iron ore runs 2,000 โ 2,500 kg/m3, so a full grab can weigh more than the crane's capacity allows |
| Precast crane | Casting bed layout, longest and heaviest element, required position tolerance, multi-point lift points | Positioning accuracy and anti-sway settings are decided by the tolerance you need, not by the crane size |
| Pickling crane | Tank layout, acid mist concentration, ventilation, coating specification, cable route away from splash | Coating system and IP rating are chosen from the environment, and change orders on coatings are slow |
| Cleanroom crane | ISO class, air change rate and airflow direction, gowning protocol, hot-work rules, cleaning chemicals allowed, ESD requirement | Welding, grinding and cutting are normally prohibited inside the room, so all fabrication must be finished outside it |
| Hazardous-area crane | Zone, gas or dust group, temperature class, equipment group, cable type, who signs the initial inspection | A Zone 1 crane with the wrong gas group cannot be fixed by adding a gland on site |
One cleanroom survey item gets missed constantly: which cleaning chemicals the room owner actually allows. IPA is almost universal, hydrogen peroxide vapour is not, and a component that is fine with one may not be with the other.
The geometry side is the part that is genuinely shared. Track and rail tolerances follow the same family of rules whether the crane carries a grab bucket or a wafer pod, and ISO 12488-1 is the usual reference for running tracks.
| Item | Tolerance | How it is measured |
|---|---|---|
| Rail span (crane track gauge) | +/- 5 mm up to 16 m span; +/- [5 + 0.25 x (S - 16)] mm above that, capped at +/- 15 mm | Tape or laser across several positions, recorded at the wheel base |
| Height difference between the two rails on one side | 0.001 x span, capped at 10 mm | Level or total station, same stations both sides |
| Rail straightness over 2 m | +/- 1 mm | Straight edge and feeler gauge along the running surface |
| Rail joint step and sideways offset | 1 mm maximum | Straight edge across the joint, both directions |
| Wheel base and diagonal of the end carriages | Wheel base +/- 2 mm, diagonal difference 5 mm maximum | Measured cold, before the crane is loaded |
| Unit load profile check (stacker and automated cranes) | +/- 5 mm where photocells are used, per FEM 9.831 | Test load of the real profile, checked at the extremes of travel |
| Absolute positioning system resolution | Down to 0.2 mm resolution on modern code-tape systems | Compare commanded position with the position the control system reports, at both ends of travel |
Two notes on that table. The span rule is the one people get wrong on a long-span precast crane, because the allowance grows with span and a 35 m runway is not held to the same number as a 15 m one. And the last row is a calibration item, not a civil works item: an encoder that reads 0.2 mm resolution does nothing for you if the reference has not been set against a surveyed mark.
A grab crane is bought for throughput, and throughput is decided by the grab, not the hoist. Which is why the commissioning list has more to do with rope equalisation, closing time and material handling trials than with the crane itself.
The first number to confirm is weight. The crane lifts the grab dead weight plus the material, so a grab that looks fine empty can push a 25-ton crane past its safe working load when it is full of wet ore. The rule we design to is a minimum 25 percent margin between the maximum loaded grab weight and the crane's rated capacity, and that number has to be checked against the real material, not a catalogue figure.
| Commissioning item | Acceptance check | Note |
|---|---|---|
| Loaded grab weight vs rated capacity | Grab dead weight + material at full fill, minimum 25% margin | Check with the wettest material the plant handles, not the driest |
| Rope equalisation (four-rope grabs) | Both shells close together, no rope slack on one side | A twisted or unequal rope set wears the sheaves and skews the grab |
| Hydraulic grab control | Cylinder movement matches the control layout; throttle valves fitted on the rotation hoses | Reversed supply polarity gives mirrored cylinder movement, which is a control fault, not a hydraulics fault |
| Closing and opening time | Measured against the cycle time the plant was sold | Most throughput shortfalls are a closing time setting, not a crane speed problem |
| Anti-sway tuning | Spill check during a full travel and stop, with the real material | Tuned empty, it will spill under load; tune it loaded |
| Proof test of the grab as a lifting accessory | 125% of rated load before use, marked with the safe working load | Under OSHA 29 CFR 1926.251(a)(4) this is mandatory for custom design grabs, and the test weight must be determined by a reliable method |
| Overload protection setting | Set with the grab weight included in the calculation | Nuisance trips on a grab crane almost always trace back to this |
The material handling trial is not optional on a grab crane. Two or three days running the actual material through the actual cycle tells you more than a day of measurements. It is also when you discover that the grab picks up more of the light fraction than anyone expected, and the cycle time you sold is not the cycle time the machine delivers.
Positioning is the whole point of a precast or stacker crane. The commissioning job is to prove the machine puts the load where the drawing says, repeatably, under a real load and at working speed. Almost every one of these projects has a tolerance in the spec, and the tolerance is what gets tested, not the crane's own control accuracy.
Practically, that means the calibration sequence runs before any load test. Reference marks are surveyed, the travel and long travel encoders are set against them, and then a test cycle is run with a representative load. On multi-hoist machines the synchronisation offset between the two hoists is what decides whether a 20 m panel goes into the mould or into the side of it.
| Calibration item | Typical target | Test method |
|---|---|---|
| Travel and long travel positioning | +/- 10 mm class for most precast work, +/- 5 mm for precision beds | Commanded against measured position at both ends and mid travel, 5 cycles |
| Repeatability at the same point | Within one third of the positioning tolerance | Ten approach moves from the same direction, marked and measured |
| Multi-hoist synchronisation | Synchronised travel with the offset held through start and stop | Test beam or real element, offset measured at the lift points under full load |
| Encoder or code-tape reference | Absolute reference set against a surveyed mark | Power-cycle the control system and re-check position without re-homing |
| Load handling device: spreader, vacuum lifter, tilting frame | Holds and releases the real element, release confirmed before travel | Full cycle with the largest and most awkward element in the yard |
| Sway and skew after stop | Settles within the cycle time the plant was designed for | Timed stop-to-stop cycle with the real load |
| Unit load profile check | +/- 5 mm where photocells are used, per FEM 9.831 | Over-size and undersize test profiles at the rack opening |
Where a stacker crane is part of an automated warehouse, the precision requirements are written down separately. In China, JB/T 13910.3-2020 covers stacker precision, including positioning accuracy and repeatability, and it is a reasonable checklist even if your project sits outside it. We usually hand over the calibration record with the commanded-versus-measured table, because the maintenance team will need it the first time a reference mark moves.
An acid-wash crane is the one installation where painting is a technical activity with acceptance criteria. The structure is usually specified with epoxy coatings and stainless internals, and the electrical side is where most of the site work lands: sealed enclosures, pressurised cabinets, and a wiring check that would be routine in a clean plant and is anything but in an acid mist environment.
Component protection on this class of crane is typically IP65 or IP67 on the core parts, with a fully enclosed control cabinet and anti-corrosive paint on the structure. Where the area is also classified, Ex d IIC T4 equipment is used instead of standard enclosures, and the installation then follows hazardous-area rules as well.
| Verification | What is checked | Acceptance |
|---|---|---|
| Coating dry film thickness | Every coat, including transport damage touch-up | Coating system selected for the corrosivity category; ISO 12944-5 covers C2 to C5 and dew point control during application |
| Structural steel in a very high corrosivity environment | Whether the spec is C5 or the higher CX category | CX systems sit outside ISO 12944-5 and have to be defined per environment |
| Weld seams and fasteners | Seam sealing, stainless fasteners used where specified | Seams and crevices are where acid attack starts; painted mild steel bolts are a scheduled replacement |
| Enclosure integrity | Gaskets, cable entries, cover fixings, no drilled holes left open | IP rating as delivered, re-confirmed after site wiring |
| Cabinet pressurisation | Positive pressure holds with the cabinet closed, purge cycle completes | Pressure switch interlock proven before the drives are enabled |
| Insulation resistance | Power circuit conductors against the protective bonding circuit | Not less than 1 MOhm at 500 V DC per IEC 60204-1; conductor bar and slip-ring assemblies have a lower permitted minimum |
| First week of operation | Acid residue on cable trays, splash shields in place, corrosion at fixing points | Best done on a planned visit rather than after the first coating failure |
The insulation resistance test is the one I would not skip on a pickling crane. Acid mist plus humidity finds its way into anything that is not sealed, and the first sign is usually an intermittent earth fault that nobody can reproduce.
This is a different kind of job. The crane itself is usually light, 0.5 to 10 tons, and the mechanical installation takes days rather than weeks. What takes the time is that everything entering the room has to be clean, everything that touches the room has to be cleanroom compatible, and at the end the room has to be proved clean again.
For scale: an ISO Class 5 cleanroom is defined as 3,520 particles of 0.5 micrometres or larger per cubic metre. Ordinary urban air carries something in the region of 35 million particles of that size in the same volume. One component that sheds metal dust does not dent that number slowly, it destroys it.
| Item | Cleanroom requirement | Site practice |
|---|---|---|
| Structure and housings | Stainless steel or anodised aluminium, no painted surfaces that can flake | Electropolished and passivated surfaces wipe clean and do not trap residue |
| Wheels | Non-shedding polymer treads, not steel on steel | Polyurethane or cast polyamide treads eliminate metal-to-metal contact and track scuffing |
| Lubrication | Low-outgassing cleanroom grease, not standard lithium grease | PFPE cleanroom grease is used to cut vapour pressure and chemical off-gassing inside recirculating air systems |
| Bearings and seals | Sealed or labyrinth-protected bearing chambers | Multi-stage lip seals and labyrinth barriers keep wear particles inside the housing |
| Hot work inside the room | Normally prohibited: no welding, grinding or cutting | All fabrication finished outside; site work is bolting only |
| Tools and packaging | Cleanroom-compatible tools and wrapping | Components pre-cleaned and wrapped before entering; card and foam packaging stays outside |
| Personnel | Room gowning protocol, not site PPE | Small trained team, minimum entries, HEPA vacuum used instead of sweeping |
| ESD | Only if the process requires it, but then the bonding must be verified | Continuity of the protective bonding circuit tested, not just visually checked |
| Final cleanliness proof | Particle count per ISO 14644-1, test methods per ISO 14644-3 | Agree the occupancy state in advance: as-built, at-rest or operational |
That last row decides arguments. ISO 14644-3:2019 lists the supporting tests, including air pressure difference, airflow and airflow direction, recovery, installed filter system leakage, electrostatic tests and particle deposition, and the classification itself is defined for three occupancy states. A crane handover test carried out at-rest proves something different from one carried out while production is running. Decide which one is in the contract before the crane arrives, not after.
If the crane sits in a classified area, the installation stops being a mechanical job with electrical support and becomes an Ex installation with a crane attached. The verification is a defined activity, and it happens before the machine is energised for the first time.
IEC 60079-17:2023 is the inspection and maintenance standard for Ex installations, and it sets out an initial inspection plus ongoing inspections, either periodic or continuous supervision by skilled personnel. The current edition replaced the 2013 version, so if your site documentation references the older edition it is worth updating the baseline.
| Check | What the inspector looks for |
|---|---|
| Equipment marking against the area classification | Zone, equipment group, gas or dust group and temperature class all match the area, not just the order |
| Cable entries and glands | Correct type for the enclosure, correctly fitted, no unused entries left open |
| Bonding and earthing | Continuity through the structure, festoon or conductor system, and the hoist |
| Cables and flexible connections | Suitable type for the zone, protected against mechanical damage along the travel path |
| Ignition sources from mechanical contact | Wheels, buffers and guides chosen so that friction or impact cannot produce sparks |
| Modifications | Nothing drilled, added or replaced that invalidates the certification |
| Records | The initial inspection report becomes the baseline every later inspection is compared against |
One practical warning on Ex cranes: the transport plugs, covers and temporary seals that protect enclosures during shipping have to come out. We have seen a crane sit for two weeks with a shipping cap still in a breather because nobody owned that step.
The electrical verification is the same family of checks for every crane, and the special versions simply raise the stakes. Where a product standard does not override them, the checks in IEC 60204-1 include a documentation check, continuity of the protective bonding circuit, fault loop verification, insulation resistance, voltage tests, protection against residual voltage and functional tests.
Two of those matter more on a special crane than on a standard one. Bonding continuity is the check that decides whether an ESD-rated cleanroom crane or an Ex crane is actually earthed through its moving structure. Insulation resistance is the check that finds moisture or acid ingress before it finds a fault current, and the IEC figure of not less than 1 MOhm at 500 V DC between power circuit conductors and the protective bonding circuit is the number to write into the report.
A load test is a load test, with one exception that catches people out: the special attachment on the end of the rope may be a lifting accessory in its own right, with its own proof test requirement. That applies to grab buckets and custom lifting frames.
| Test | Load applied | What it proves |
|---|---|---|
| Static proof test | 125% of rated load | Structure, connections and hoist hold the load without permanent deformation |
| Dynamic test | 110% of rated load through a full cycle | Brakes, drives, limits and control behaviour under working conditions |
| Grab or custom accessory proof test | 125% of its rated load, before first use | The accessory is safe on its own; it must also be marked with its safe working load |
| Brake holding test | Rated load plus, held with the brake only | No creep, and lowering speed stays within the permitted limit |
| Positioning and synchronisation test under load | Rated load, working speed | Precast and stacker cranes: accuracy proved with a load, not empty |
| Cleanliness verification | No load or a cleaned test load | Cleanroom cranes: particle count in the agreed occupancy state, after the crane has been operated |
| Interlock and function test | No load | Limits, pressurisation interlocks, anti-sway and Ex protection functioning as designed |
On a cleanroom crane, the load test is planned as a contamination event rather than a lifting event. Weights are cleaned and wrapped, the test runs at reduced speed, and the particle count is taken afterwards with the room in the state the contract specifies. If the test weights come in on a wooden pallet, the test has effectively been moved to the loading dock.
The ranges below are our own quotation ranges for installation and commissioning of the machine, excluding civil works and the crane itself, and excluding structural steel. They are engineering estimates from our projects, not a published statistic, and the spread is wide because the environment, not the tonnage, sets the labour.
| Crane type and size | Install and commission, USD | Specialty verification, USD | What drives the number |
|---|---|---|---|
| Grab crane, 25 t, A7 | 18,000 โ 35,000 | 3,500 โ 8,000 grab commissioning and proof test | Material handling trials and grab tuning, not the crane erection |
| Precast crane, 50 t, 30 m span | 35,000 โ 70,000 | 5,000 โ 12,000 calibration and synchronisation | Two cranes, one bridge, and a tolerance that has to hold under load |
| Pickling crane, 10 t, IP55 | 12,000 โ 25,000 | 2,500 โ 5,500 coating and enclosure verification | Working time in an area with restricted access and acid exposure |
| Cleanroom crane, 2 t, ISO Class 5 | 15,000 โ 40,000 | 3,000 โ 7,000 particle count verification | Gowning, cleaning and re-testing; the clean installation premium runs 60 โ 120% over a standard crane |
| Ex crane, 20 t, Zone 1 | 25,000 โ 55,000 | 4,000 โ 12,000 initial Ex inspection and certification support | Certified components, certified workmanship and a documented baseline |
For comparison on labour, skilled crane and hoist technicians in the United States were being advertised in the 35 to 50 US dollar per hour range in 2026 job listings, before travel and accommodation. On a site where every entry requires gowning or a permit, that hourly rate is the least of the cost.
The table below is the distribution of first-year service calls we have logged on special crane projects, grouped by type. It is our own service record, not a published industry statistic, and we publish it because it is more useful than a generic list of risks.
| First-year issue | Share of calls | Prevention during installation |
|---|---|---|
| Grab or lifter wear and rope equalisation | 28% | Equalise ropes and re-check after the first week of production |
| Particle or cleanliness complaints after the room is released | 22% | Pre-clean components off site, verify grease type, re-test after first operation |
| Positioning or synchronisation drift under load | 18% | Calibrate with a real load, record commanded versus measured positions |
| Overload relay nuisance trips | 12% | Set the overload with the attachment weight included |
| Coating or seal damage in the first months | 11% | Record dry film thickness and gasket condition at handover, inspect after one month |
| Limit, bonding or interlock faults | 9% | Test them at the extremes of travel, not in the middle |
Roughly half of these are commissioning failures rather than component failures, which is why the handover file in the next section is shorter than it looks but does more work than it should have to.
Ten documents or records. On a special crane, the fourth and fifth items are the ones that cost money later if they are missing.
| # | Item | Why it is on the list |
|---|---|---|
| 1 | As-built drawings and control settings | The next engineer needs to know what was actually installed, not what was quoted |
| 2 | Rail geometry record: span, levels, joints, wheel base | Baseline for tracking alignment drift |
| 3 | Electrical verification record: bonding continuity, insulation resistance at 500 V DC | Proof the machine was safe at handover, and a number to compare against |
| 4 | Signed load test report with the weights used and results | Including the grab or accessory proof test, with the safe working load marking recorded |
| 5 | Specialty verification records | Particle count, initial Ex inspection, or positioning calibration as applicable |
| 6 | Coating dry film thickness and touch-up record | Pickling and corrosive environments only, but then it matters most |
| 7 | Lubricant specification and quantities | Cleanroom grease substituted with standard grease during a service is a common, expensive mistake |
| 8 | Operating procedure for the environment | Gowning, cleaning and access rules; for Ex cranes, the permit-to-work requirements |
| 9 | Inspection schedule set by duty class | An A7 crane needs a different interval from an A4 one; so does an Ex installation |
| 10 | Spare parts list with the wear items and their lead times | Special crane parts are not stocked locally, and that is a schedule risk, not just a cost |
If you are buying a special crane rather than installing one, the useful thing to send with the enquiry is the environment, not just the tonnage. Acid mist, ISO class, zone classification or the elements you handle decide more of the machine than the capacity does.
Our rule on site is simple. Nothing energises before the bonding test, nothing is handed over before the load test, and on a cleanroom or Ex project nothing is released before the specialty verification is written down. If you want to see how those three gates are handled on a project similar to yours, the grab, precast, pickling and cleanroom crane ranges on our product page list the capacity and protection data we start from.
Two to four weeks for a cleanroom crane, three to six weeks for a grab or pickling crane, four to eight weeks for a large precast crane, and four to seven weeks for an Ex crane. The range is set by the specialty verification more often than by the erection. Mechanical installation of a light cleanroom crane is a few days; the cleaning and the particle count test with the room empty is what takes the time.
Only partly, and it is usually a bad trade. Seals, lubrication, wheel materials and cable entries can be changed, and for a mild cleanroom duty that may be enough. What cannot be changed on site are the structural materials, the surface finish and the certification basis of an Ex crane. If the requirement is a defined ISO class or a defined Ex marking, the machine has to be built for it. A conversion that is claimed to meet it is worth a written statement from whoever is claiming it.
Whoever provides it, before first use, at 125 percent of its rated load and with the safe working load marked on the bucket. Under OSHA 29 CFR 1926.251(a)(4) this is mandatory for special custom design grabs, and the test weight has to be established by a reliable method rather than estimated. ASME B30.20 is the usual inspection reference for below-the-hook devices, and it is accepted as the practical basis for inspection programmes.
Yes, and it is planned like any other contamination event. Weights are cleaned and wrapped before entry, the test runs at reduced speed, and no wooden pallets or untreated lifting gear go through the airlock. The particle count is then taken in the occupancy state the contract specifies, after the crane has been operated, because that is when wear particles are generated.
An initial inspection before first energising, carried out by competent personnel against the area classification and the equipment marking, with the record kept as the baseline for everything afterwards. IEC 60079-17:2023 covers the initial inspection and the ongoing inspections that follow, either periodic or by continuous supervision from skilled personnel. The current edition replaced the 2013 version, so plant documentation referencing the older edition should be updated.
Yes, and duty class is the main driver. A grab crane running A7 or A8 wears faster than a light assembly crane, and its rope inspection interval under ISO 4309 shortens accordingly. On top of that come the environment-specific schedules: coating and seal checks on a pickling crane, cleanliness verification on a cleanroom crane, and periodic Ex inspections on a hazardous-area installation. A copy of the standard intervals is not a maintenance plan.
Tell us the material you handle, the room class, the zone classification or the acid exposure, and the capacity you need. We will come back with the machine configuration, the verification that applies to it, and an installed cost breakdown rather than a catalogue price.
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