Grab, precast, pickling, cleanroom and explosion-proof cranes each answer to a different standard set. ATEX 2014/34/EU and IEC 60079 for hazardous areas, ISO 14644-1 and EU GMP Annex 1 for cleanrooms, ASME B30.20 with BTH-1 for grabs, magnets and vacuum lifters, CMAA 70 service classes and EN 15011 for structure. What each document decides, and what to put in the inquiry.
A special crane is not one machine, so it does not answer to one standard. A grab crane on a port unloader is judged under ASME B30.20 for the grab and CMAA 70 Class E or F for the structure. An explosion-proof crane needs ATEX 2014/34/EU or IECEx certification under IEC 60079, with the zone, gas group and temperature class on the nameplate. A cleanroom crane is specified against ISO 14644-1. Buyers who name the crane standard in the RFQ and leave the attachment and the environment out get quotes they cannot compare.
Start by accepting that "special crane" is a sales category, not a machine type. Every special crane we build is a standard bridge or gantry structure carrying an unusual attachment, working in an unusual environment. Each of those three things drags its own standard set into the project.
That is why two suppliers can both quote a 16 ton grab crane and be describing different machines. One has read the inquiry as bulk material handling with occasional use. The other has read it as twenty-plus lifts an hour at near rated capacity, which is CMAA Class E territory, and has sized the structure, the rope and the motors accordingly. The prices will not be close, and neither will the service life.
| Special crane type | Structure standard | Attachment / device standard | Service or duty class | Environment standard |
|---|---|---|---|---|
| Grab / clamshell | EN 15011, CMAA 70 | ASME B30.20 + BTH-1 (grapple) | CMAA E or F, ISO M7-M8 | — |
| Precast concrete component | EN 15011, CMAA 70 | ASME B30.20 (spreader beam, vacuum lifter, tilting frame) | CMAA D to F, ISO M5-M7 | — |
| Pickling / acid washing | EN 15011, EN 13001 | ASME B30.20 (hook block, lifting beam) | CMAA D, ISO M6 | EN ISO 12944 C5-M, IP54 / IP55 |
| Cleanroom | EN 15011, EN 13001 | ASME B30.20 (below-the-hook device) | CMAA C or D, ISO M4-M5 | ISO 14644-1, EU GMP Annex 1 |
| Explosion-proof (any type) | EN 15011, EN 13001 | ASME B30.20 (magnet, grab) | CMAA E or F, ISO M6-M8 | ATEX 2014/34/EU, EN IEC 60079, IECEx |
Worth noting on the table: the environment column is where most quotations quietly fall apart. Nothing in EN 15011 or CMAA 70 tells a manufacturer how to protect a crane from hydrochloric acid fumes. You have to specify that yourself, and the specification has to be measurable.
A declaration of conformity lists the standards the machine was assessed against. For an ordinary industrial overhead crane that list is short: EN 15011 for the crane, EN 13001 for limit state design, EN 60204-32 for the electrical equipment. Nothing in that set covers a grab, a magnet, a vacuum lifter or an acid tank.
The attachment is treated as a device in its own right. In North America that means ASME B30.20 for marking, construction, installation, inspection, testing, maintenance and operation, sitting on top of ASME BTH-1 for the actual design criteria. The split matters: BTH-1 sets the rated load basis, the design category and the service class, plus the allowable stress and weld rules. B30.20 tells you what has to be marked on the device, how often it gets inspected and what a load test record has to contain. A grab that arrives with a nice BTH-1 design file and no inspection interval engraved on it is still non-compliant.
One clause in B30.20 catches people out. Devices certified under it are not to be subjected to impact or shock loads. Now think about what a clamshell grab does when it lands in a pile of scrap. That is exactly why grab duty pushes you up the service classes and why the structure gets reinforced rather than merely repainted.
In Europe the same logic runs through the Machinery Regulation. Change the electrical equipment for a hazardous area, or the materials for a cleanroom, and the assessment scope changes with it. The family certificate your supplier already holds for their standard EOT crane is not the certificate your site will be audited against.
Explosion protection is decided by how often the explosive atmosphere is present, not by how alarming the material sounds. ATEX 2014/34/EU is the mandatory route into the European Economic Area. IECEx is the parallel international scheme built on the IEC 60079 series, and its practical advantage is mutual recognition: one IECEx certificate is accepted in more than thirty member countries without retesting, which is why projects in the Middle East, Africa and much of Asia often name it directly.
| Zone (gas) | Zone (dust) | Atmosphere present | Equipment category | Typical protection |
|---|---|---|---|---|
| Zone 0 | Zone 20 | Continuously or for long periods | Category 1 | Rarely electric - pneumatic or hydraulic machines preferred |
| Zone 1 | Zone 21 | Likely to occur in normal operation | Category 2 | Ex d motors with Ex e terminal boxes, Ex p cabinet for the drive |
| Zone 2 | Zone 22 | Unlikely, and short lived if it occurs | Category 3 | Ex ec or Ex nA equipment is normally sufficient |
Three things go on the nameplate and all three have to be right. The gas group runs IIA, IIB, IIC, and IIC is the demanding one because it covers hydrogen and acetylene. The temperature class runs T1 to T6 by maximum surface temperature: T1 at 450 degrees Celsius down to T6 at 85 degrees Celsius, with T4 at 135 and T3 at 200 covering most industrial hydrocarbons, solvents and natural gas. A Zone 1 gas crane might carry a marking like II 2G Ex db eb mb IIC T4 Gb, which is Group II, Category 2, gas atmosphere, several protection types, gas group IIC, temperature class T4, high protection level.
The hoist is where the money goes. An explosion-proof hoist needs a certified flameproof motor, a dual brake system with spark-free friction material, limit switches inside Ex d enclosures, an arcing-free power supply - either a festoon rated for the area or a conductor rail - and a certified pendant or radio remote. If you want variable frequency control, the drive has to sit in an Ex p pressurised or Ex d flameproof cabinet, and that cabinet is often bigger than the hoist itself.
Retrofitting a standard crane is almost never worth it. Motors, controls, cabling, limit switches and the pendant all get replaced with certified components, earthing gets redesigned, and the whole assembly goes back to a Notified Body. We price it out for customers every year and the factory-certified machine wins nearly every time.
ISO 14644-1 defines nine cleanroom classes, ISO 1 through ISO 9, by the maximum permitted concentration of airborne particles per cubic metre. ISO 5, 7 and 8 are the ones you meet in pharmaceutical and electronics work, and they map roughly onto EU GMP Grades A and B, C, and D.
| ISO 14644-1 class | EU GMP grade | Typical use | Max particles ≥ 0.5 µm per m³ |
|---|---|---|---|
| ISO 5 | Grade A / B | Aseptic filling, sterile core | 3,520 |
| ISO 6 | — | Buffer and background zones | 35,200 |
| ISO 7 | Grade C | Support areas around the core | 352,000 |
| ISO 8 | Grade D | Component and container handling | 3,520,000 |
| ISO 9 | — | General industrial clean area | 35,200,000 |
The GMP layer adds what ISO 14644 does not measure. EU GMP Annex 1 requires continuous particle monitoring in Grade A zones for the whole duration of critical processing, including equipment assembly. Adjacent grades sit at a pressure differential of about 10 to 15 pascals, and Grade A critical zones need unidirectional airflow at 0.36 to 0.54 metres per second at the working position. Filters are specified by EN 1822-1:2019, where H14 means at least 99.995% integral efficiency and U15 at least 99.9995%. Requalification runs on a six-month cycle for ISO Class 5 and cleaner, and twelve months for Classes 6 to 9.
For the crane, that translates into a specific build rather than a class label. Stainless steel rather than painted carbon steel, because paint flakes and flakes are particles. Sealed fasteners with no exposed threads where dust can gather. Lubricant that stays put instead of being flung off the rope. Cable and festoon material chosen for low shedding. Minimal horizontal ledges, because a ledged crane structure is a particle trap sitting above your product. And a running profile that does not break the unidirectional airflow you just paid for.
Here is the commercial part. Over-classifying is the expensive mistake. Putting an ISO 5 crane into a zone that only needs ISO 7 raises the capital cost by something like three times, and then keeps costing you in cleaning and maintenance for the life of the machine, with no compliance benefit at all. If a hygiene engineer has not written the class down for you, get that before you get quotes.
A grab crane splits into two problems: the grab and the crane that carries it. The grab is a below-the-hook device under B30.20 and a designed structure under BTH-1, and clamshell grabs are explicitly in scope along with magnets, vacuum lifters and scrap handling grapples. The crane behind it is a duty class decision.
CMAA Specification 70 gives six service classes, A through F. The upper end is where grabs live. Class E is severe service, described for magnet and bucket cranes in scrap yards, cement mills, lumber mills and fertiliser plants, with twenty or more lifts per hour at or near rated capacity. Class F is continuous severe service, handling loads approaching rated capacity continuously under severe conditions for the crane's whole life, and it is written for custom designed specialty machines that are essential to the plant. Under the ISO and FEM scheme the same territory is M7 to M8, and in the A-class language used on Chinese and European quotations it is A6 to A8.
| Class | Name | Load handled | Lifts per hour | Typical application |
|---|---|---|---|---|
| A | Standby or infrequent | Light, rarely near capacity | Low | Powerhouse and turbine room service |
| B | Light | Up to 50%, average about 30% | 2 to 5 | Light machine shops, repair bays |
| C | Moderate | Up to 50% of capacity | 5 to 10 | Machine shops, light foundries |
| D | Heavy | Approaching 50% constantly | 10 to 20 | Heavy machine shops, foundries, steel warehouses |
| E | Severe | Approaching rated capacity | 20 or more | Scrap yards, cement mills, bucket and magnet duty |
| F | Continuous severe | Near rated capacity, continuously | Continuous | Specialty cranes essential to plant production |
Get this wrong and the failure is predictable. A grab crane quoted at Class D and run at Class E duty will not fail in month two. It will fail in year four, out of warranty, with a cracked end carriage and a rope that has been scrapped three times. Our own grab cranes cover 5 to 50 tons with A6 to A8 duty, double-rope, multi-rope, hydraulic and electric grab options, and the class is the first question we ask, not the last.
The remaining special types do not have a dedicated product standard either. EN 15011 covers bridge and gantry cranes generally, EN 13001-1, -2 and -3 supply the limit state design method, and EN 13135 covers the equipment. Everything beyond that is specification, and specification is where a good inquiry beats a cheap quote.
Precast concrete cranes are about geometry and synchronisation. Spans of 10 to 40 metres, lifting heights of 6 to 20 metres, VFD control at 0.5 to 8 metres per minute, and two or more hoists running in sync for a 30 metre bridge girder. The spreader beam, the vacuum lifter or the tilting frame hanging under the hook is a B30.20 device with its own rated load marking, and it has to be matched to the panel being lifted rather than to the crane capacity. We had a customer lifting 24 metre piles with a spreader rated for a shorter bed, and the load was carried on the beam rather than on the hoists. That is a BTH-1 design category error, not a crane problem.
Pickling and acid washing cranes are a corrosion problem that happens to have a hoist attached. There is no single standard that tells you what an acid-fume crane looks like, so you specify by measurable properties. EN ISO 12944 corrosion categories run C1 to C5-M, and hot pickling lines sit at or above C5-M. Add IP54 or IP55 for the enclosures, positive pressurisation for the control panel, stainless steel internals and epoxy coating systems, sealed conduit, acid-resistant bumpers, and rail covers. Every one of those items is a line item in the quotation, and a supplier who has not priced it has not understood the job.
Special crane pricing looks erratic until you break it into the specification steps that drive it. Below is the range we quote for export projects in 2026, free on board, standard spans and lifting heights, no installation.
| Special crane type | Capacity and span | Certification scope | Indicative FOB price, USD (2026) |
|---|---|---|---|
| Grab crane | 5 t | A6, CMAA Class D | 30,000 to 46,000 |
| Grab crane | 16 t | A7, CMAA Class E | 58,000 to 88,000 |
| Grab crane | 50 t | A8, CMAA Class F | 155,000 to 265,000 |
| Precast crane | 10 t / 25 m | A5, multi-hoist synchronised | 48,000 to 72,000 |
| Precast crane | 50 t / 35 m | A6, CMAA Class D | 125,000 to 195,000 |
| Precast crane | 100 t / 40 m | A7, CMAA Class D to F | 215,000 to 330,000 |
| Pickling crane | 5 t / 15 m | IP55, EN ISO 12944 C5-M | 34,000 to 54,000 |
| Pickling crane | 20 t / 22 m | IP55, EN ISO 12944 C5-M | 88,000 to 135,000 |
| Cleanroom crane | 3 t, ISO 7 | Grade C compatible | 50,000 to 78,000 |
| Cleanroom crane | 10 t, ISO 5 | Grade A / B compatible | 125,000 to 185,000 |
| Explosion-proof crane | 10 t, Zone 1, IIC, T4 | ATEX Category 2, IECEx | 98,000 to 155,000 |
Installation and commissioning typically add 30% to 60% on top of the FOB figure, and a hazardous area or cleanroom project sits at the top of that band because of the documentation and the site acceptance testing. Most of the cost step between one row and the next is not margin. It is heavier steel, larger motors, certified electrical components and the paperwork that proves they are certified.
| Specification step | What it adds | Effect on price against a base industrial crane |
|---|---|---|
| CE / EN 15011 conformity file | Technical file, risk assessment, declaration of conformity | +3% to +6% |
| Duty class A5 to A7 | Heavier structure, larger motors, M7 mechanisms | +15% to +25% |
| IP55 with C5-M corrosion package | Sealed panels, epoxy systems, stainless internals | +25% to +40% |
| Cleanroom ISO 8 to ISO 7 | Stainless skins, sealed fasteners, low-shedding finishes | +40% to +60% |
| Cleanroom ISO 5 (Grade A / B) | Continuous-monitoring ready build, certified materials | +120% to +180% |
| ATEX Zone 2 (Category 3) | Ex ec or Ex nA motors, controls and pendants | +35% to +50% |
| ATEX Zone 1 (Category 2, IIC, T4) | Ex d, Ex e and Ex p combination with certified components | +80% to +130% |
Two of those lines deserve a comment. The duty class step from A5 to A7 typically moves the price 15% to 25%, and it is the cheapest insurance in the list, because the alternative is a rebuild. The cleanroom step to ISO 5 is the most expensive single decision on a special crane, and it is the one most often taken without need.
The Machinery Regulation (EU) 2023/1230 replaces the Machinery Directive 2006/42/EC and applies from 20 January 2027. For special cranes the change is less about the machine and more about the paperwork trail. Technical documentation has to be kept and updated, digital instructions become acceptable, and the duties of importers and distributors are spelled out in more detail than before. Conformity assessment has to reflect the configuration actually delivered.
Practically, if your delivery date lands after January 2027, put the regulation number in the inquiry and ask the supplier which framework the conformity file will be built against. Suppliers who only ever built files under the old directive will need time to update templates, and you do not want that conversation in the month the crane ships.
Nine times out of ten, a comparison problem is an inquiry problem. Put these ten items in writing and the quotes you get back will be comparable.
Item eight is the one that saves the most time later. If you cannot state the standard set and the regulation, the supplier will pick one for you, and it may not be the one your auditor asks about.
There is no single special crane standard, because a special crane is a normal crane structure with a special attachment in a special environment. The structure still follows EN 15011 with EN 13001 for limit state design in Europe, or ASME B30.2 and CMAA 70 in North America. The attachment is a separate device: a grab, magnet, vacuum lifter or spreader beam falls under ASME B30.20 for safety and ASME BTH-1 for design, and under the EU Machinery Regulation as lifting equipment. The environment adds its own framework - ATEX 2014/34/EU with IEC 60079 for hazardous areas, ISO 14644-1 with EU GMP Annex 1 for cleanrooms, and EN ISO 12944 corrosion categories for pickling and acid washing. A correct RFQ names all three layers.
No. The declaration of conformity lists the standards the machine was assessed against, and a standard industrial crane is assessed against EN 15011 and EN 13001 only. Add an Ex motor, an Ex pendant, a pressurised control cabinet or a flameproof limit switch and the electrical equipment changes scope, so the ATEX assessment and the IECEx or EU-type examination certificates have to be added. The same applies in cleanrooms: nothing in EN 15011 measures particle shedding, so the ISO 14644-1 class and the surface, lubrication and materials requirements must be written into the specification separately. Ask for the certificate that names your actual configuration, not the family certificate.
It depends on how often the explosive atmosphere is present, not on how dangerous the material feels. Zone 0 covers an atmosphere present continuously or for long periods, Zone 1 covers one likely to occur during normal operation, and Zone 2 covers one that is unlikely and short lived. Dust follows the same logic as Zone 20, 21 and 22. Zones 0 and 20 rarely take an electric crane at all, since pneumatic or hydraulic machines are preferred there. Zone 1 and Zone 21 need Category 2 equipment, typically flameproof Ex d motors with increased safety Ex e terminal boxes and, where a drive is used, a pressurised Ex p cabinet. Zone 2 and Zone 22 accept Category 3 equipment such as Ex ec or Ex nA. The gas group matters as much as the zone: IIC is the most demanding and covers hydrogen and acetylene, while IIA covers most hydrocarbon gases. The temperature class must stay below the auto-ignition temperature of whatever you handle - T4 at 135 degrees Celsius covers most industrial solvents and natural gas, and T6 at 85 degrees Celsius is what hydrogen work needs.
Match the class to the zone the crane actually travels through, and remember that a crane usually spans more than one grade. ISO 14644-1 defines nine classes from ISO 1 to ISO 9 by the maximum permitted airborne particle count per cubic metre. ISO 5, 7 and 8 are the ones you meet in practice, and they map roughly onto EU GMP Grades A and B, C, and D. Grade A sterile filling zones require continuous particle monitoring during critical processing, so a crane serving that area needs stainless steel construction, sealed fasteners, no exposed lubricant, low-shedding cable and a finish that does not flake. That specification is expensive, so do not over-classify. Specifying ISO 5 where ISO 7 is enough raises capital cost, energy cost and maintenance burden with no compliance gain.
CMAA Specification 70 splits overhead crane service into six classes, A through F. Under the specification, Class E covers severe service such as magnet and bucket cranes in scrap yards, cement mills, lumber mills and fertiliser plants, with twenty or more lifts per hour at or near rated capacity. Class F is continuous severe service: the crane handles loads approaching rated capacity continuously under severe conditions for its whole life, and it is used for custom designed specialty cranes that are essential to the plant's production. If a grab crane, a pickling crane or a precast crane sits on a line that cannot stop, that is a Class F conversation, and the structure, motors, brakes and rope factor of safety all move with the class.
The Machinery Regulation (EU) 2023/1230 replaces the Machinery Directive 2006/42/EC and applies from 20 January 2027. For special cranes the practical differences are on documentation and on who carries the obligation. Technical files have to be maintained digitally and instructions may be supplied in digital form, importer and distributor duties are described in more detail, and conformity assessment has to reflect the actual configuration delivered rather than a generic family certificate. If your delivery lands after January 2027, say so in the RFQ and ask the supplier to state which regulation the conformity file is built against.
Related articles:
How to Size a Special Crane: Capacity, Duty Class, Span & Attachment Selection
Special Crane Cost & Total Cost of Ownership: 2026 Pricing and 10-Year TCO
Hoist Standards 2026: ASME B30.16, HST-1 to HST-6, FEM 9.511 & EN 14492-2 Duty Class Rules
Combination Crane Standards 2026: EN 16851, ASME B30.11 & OSHA
Gantry Crane Standards 2026: EN 15011, ASME B30.2 & ISO 12480-1