CMAA 70, CMAA 74, ASME B30.2, OSHA 29 CFR 1910.179, FEM 1.001 / ISO 4301 and EN 15011 โ the rules that decide how your rail-mounted gantry, semi-gantry or portable aluminum gantry is designed, inspected, priced and certified. Written for buyers and plant engineers comparing quotes across markets.
A gantry crane is the rare machine where the standard you name in the RFQ changes the steel tonnage before anyone draws a member. In North America, a multiple-girder gantry is specified to CMAA 70 and a single-girder gantry usually follows CMAA 74 practice; both are inspected under ASME B30.2 and operated under OSHA 29 CFR 1910.179, which names overhead and gantry cranes directly. In Europe and most export markets, EN 15011 is the standard written for bridge and gantry cranes together, backed by EN 13001 structural rules and FEM 1.001 / ISO 4301 duty groups M1-M8. The gap between the families is not cosmetic: it shows up in the service class, in the 15-25% price swing between duty classes, in the wind speed the structure must survive, in the rail tolerance your civil engineer has to build, and in the 125% load test your inspector runs before acceptance. Because a gantry is self-supporting, the legs, the rail and the foundation are part of the crane specification in a way they are not for a bridge crane. And from 20 January 2027 the EU Machinery Regulation 2023/1230 replaces the Machinery Directive for every crane placed on the European market, which tightens the documentation importers must hold. This guide lines up the systems, shows where single-girder and double-girder gantries split between CMAA 70 and 74, and gives you an RFQ checklist so your supplier, your inspector and your civil engineer quote on the same basis.
Start with the configuration and the destination market, not the capacity. A gantry crane carries its bridge on legs that run on rails at yard level โ or, in the rubber-tyred form, on wheels that steer. That self-supporting layout is exactly why the standard families treat it as their own category, separate from building-runway bridge cranes. The table below lines up the three systems a buyer actually meets.
| Aspect | CMAA 70 / CMAA 74 | ASME B30.2 + OSHA 1910.179 | EN 15011 + EN 13001 / FEM |
|---|---|---|---|
| Role | Specification standards for new cranes | Safety and inspection rules for installed cranes | Harmonized design rules and CE backbone |
| Gantry coverage | CMAA 70: multiple-girder top-running bridge & gantry. CMAA 74: single-girder, under-running trolley hoist practice | ASME B30.2 covers overhead & gantry, top-running, single/multiple girder; OSHA 1910.179 names overhead & gantry | EN 15011:2020 covers bridge AND gantry cranes, single and multiple girder |
| Classification | Service classes A-F by load spectrum and cycles | No class system; service sets inspection frequency | FEM 1.001 / ISO 4301 duty groups M1-M8 |
| Critical interfaces | Girder, legs, end carriages, wheel loads | Rail clamps, wind restraints, markings, 125% load test | EN 13001-2 load actions incl. wind; EN 13001-3-1 fatigue |
| Electrical components | NEMA-rated, typically 480V/60Hz | References NEMA/NFPA practice | IEC-rated per EN 60204-32, 400V/50Hz typical |
| Typical use | US/Canada yards, plants and precast facilities | US general industry enforcement | EU market and CE-certified export projects |
Buyers in Southeast Asia, the Middle East and Latin America usually get European-style quotations because most export manufacturers build to EN and FEM, but the destination project may be written on CMAA practice. That mismatch is common and it is exactly why the RFQ must name one family. Rail-mounted industrial gantries are the outdoor workhorse for stockyards, precast yards, steel service centers and container depots; SIEC builds them from 5 to 100+ tons with spans to 40 m and lifting heights to 20 m, rail-mounted or rubber-tyred, plus a separate light aluminum gantry line at 0.25-2 tons for portable maintenance work.
A bridge crane borrows its runway from the building: the columns and roof steel are already there, and the crane simply rides on top. A gantry crane brings its own legs, and everything that holds it up โ the rail, the foundation under the rail, the wind restraint when it is parked โ becomes part of the crane scope. That is why the standard question comes up earlier for gantry buyers than for anyone else, and why a quotation without rail data is incomplete.
The configuration also decides which volume of the standard applies. A top-running double-girder gantry with a trolley on top of the girder sits in the CMAA 70 world in North America and in the top-running part of EN 15011 in Europe. A single-girder gantry with an under-running trolley hoist running on the bottom flange is closer to CMAA 74 practice, and EN 15011 covers that configuration as well without needing a second document. In Europe the harmonized standard deliberately treats bridge and gantry cranes in one document, so the single-vs-double split matters less there than the duty group and the wind calculation.
CMAA classifies the crane into service classes A through F, where the class is decided by the load spectrum โ how often the crane lifts near its rated capacity โ and the number of operating cycles over its design life. Class A is standby or infrequent service, Class C is normal single-shift duty, Class D handles two-shift work with frequent loads near capacity, and Classes E and F cover severe continuous service in mills, foundries and container terminals. For a gantry, the class letter drives the girder depth, the leg section, the wheel size and the hoist mechanism rating, which is why the same 20-ton gantry can legitimately cost very different amounts from two suppliers quoting different classes.
The mistake first-time gantry buyers make is buying on tonnage alone and letting the supplier pick the class. A precast yard running a gantry two shifts at 60-80% of rated load is Class D territory; quote it as Class C and the girder will be too light, the fatigue life too short, and the first inspection report will say so. State the expected cycles per hour and hours per day in the inquiry and ask the supplier to confirm the class letter on the quotation.
ASME B30.2 covers overhead and gantry cranes with top-running bridge, single or multiple girder, and top-running trolley hoist. It sets two inspection tiers: frequent inspection by the operator or a designated person, and periodic inspection by a qualified person, with a comprehensive annual inspection and documented report as the minimum for most installations. OSHA 29 CFR 1910.179 applies to overhead and gantry cranes in general industry and, unlike the jib crane situation, names gantry cranes directly โ so a US facility does not need the general duty clause to reach the machine.
The 125% rated-load test deserves its own line because it is the acceptance milestone every standard family shares. It proves the structure can hold the load once โ it does not prove the duty class is right, which is why the class letter matters more than the test certificate for the long run.
EN 15011:2020 is the harmonized standard written for bridge and gantry cranes โ the document that covers a rail-mounted gantry in one place, single or multiple girder. It sets requirements for design, controls, warnings and safe use, while EN 13001 provides the structural basis: EN 13001-2 defines load actions with dynamic factors in the phi 1.2-1.6 range plus wind loads, and EN 13001-3-1 verifies steel structures against stress, buckling and fatigue using S-N curves. Electrical safety falls under EN 60204-32. Together they form the technical backbone of CE certification under the Machinery Directive, and from 20 January 2027 under the Machinery Regulation (EU) 2023/1230.
What buyers keep getting wrong: CE is not a single test certificate. It is a conformity assessment in which the manufacturer declares compliance, keeps a technical file, performs a risk assessment and affixes the CE mark. So when a supplier says 'CE certified', ask for the EU declaration of conformity and the harmonized standards list. If they cannot produce it, the CE claim is worth nothing in an EU inspection. The 2027 Regulation strengthens obligations for importers and distributors, requires more detailed technical documentation, and tightens rules on substantial modification โ so if you are importing gantry cranes into Europe for a 2027 project, confirm the supplier's documentation is already aligned before you sign.
European and most export-market suppliers classify the crane with FEM 1.001 / ISO 4301 duty groups M1-M8, based on the load spectrum and the number of operating cycles over the design life. The hoist, trolley and travel mechanisms are classified separately, and a complete quotation states the M-class on each. For an industrial gantry, M4 to M7 covers nearly the whole range from occasional yard use to continuous port duty. The table below maps the two systems in practical terms.
| FEM/ISO group | Typical CMAA equivalent | Gantry application |
|---|---|---|
| M3 | Class B | Maintenance, toolroom, infrequent yard loading |
| M4 | Class B/C | Light stockyard work, single-shift intermittent |
| M5 | Class C | Regular single-shift yard and workshop duty |
| M6 | Class D | Two-shift precast, steel service center, production |
| M7 | Class E | Continuous yard/port handling near rated capacity |
The mapping is approximate โ the two systems calculate differently โ so confirm the class in writing with the supplier. What matters for your budget is that the M-class appears on the quotation. A supplier who quotes a '50 ton gantry crane' with no M-class leaves room to ship the lightest mechanism that passes the load test.
Duty class is the most expensive line item hidden inside a crane quotation, and gantry cranes exaggerate the effect because the whole structure moves up with the class โ girder, legs, wheels, drives, hoist. An M6-rated gantry typically costs 15-25% more than an M4-rated equivalent at the same capacity and span. The table below shows typical 2026 FOB price bands for SIEC gantry cranes with the duty class each configuration is normally built to (Industry estimates, 2026).
| Configuration | Span | Typical class | Price range (FOB) |
|---|---|---|---|
| 5 ton, single girder | 10 m | M4 | USD 8,000-12,000 |
| 10 ton, single girder | 12 m | M4-M5 | USD 14,000-21,000 |
| 16 ton, single girder | 16 m | M5 | USD 22,000-33,000 |
| 20 ton, single girder | 18 m | M5 | USD 28,000-42,000 |
| 20 ton, double girder | 20 m | M5 | USD 35,000-52,000 |
| 32 ton, double girder | 22 m | M5-M6 | USD 52,000-78,000 |
| 50 ton, double girder | 25 m | M6 | USD 75,000-120,000 |
| 75 ton, double girder | 30 m | M6-M7 | USD 130,000-195,000 |
| 100+ ton, double girder | 30-40 m | M7 | USD 180,000-280,000 |
Remember that the machine is not the full story. Total installed cost for a rail-mounted gantry, including the rail, foundations, erection and commissioning, typically runs 50-80% above the equipment price โ a 20-ton gantry at USD 28,000-52,000 FOB lands at USD 45,000-85,000 installed on a prepared yard. A rubber-tyred gantry removes the rail but adds drive, steering and a prepared travel surface, which shifts cost rather than removing it. On the duty-class jump itself: moving a 50-ton gantry from M5 to M6 is roughly USD 11,000-30,000 on the equipment, and the structural upgrade also increases wheel loads, so your civil engineer should see the final class before the foundation is poured.
This is the part that surprises buyers coming from indoor bridge cranes. A gantry works outdoors, so wind is a design load, not a footnote. European practice sizes the out-of-service structure for the regional wind speed under EN 13001-2 and ISO 4302, and the machine must be parked and restrained โ rail clamps, tie-downs or brakes โ when the wind exceeds its rating. An anemometer with an alarm set around 20 m/s is standard on outdoor gantries in exposed yards. Ask the supplier for the design wind speed, the out-of-service parking procedure and the wind stability calculation with the quotation.
ASME/NEMA-designed gantry cranes typically run NEMA-rated motors and components on 480V/60Hz. FEM/EN-designed cranes use IEC-rated components on 400V/50Hz, and outdoor machines need weatherproof enclosures and cable or festoon systems rated for yard conditions, not indoor panels. If your plant runs 380V/50Hz, 415V/50Hz or 480V/60Hz, the mismatch only shows up at commissioning unless you specify it. State your voltage, phase and frequency in the RFQ. SIEC gantry cranes cover 380V-690V, 3-phase, 50/60Hz, with radio remote, cabin or pendant control and VFD travel as standard options, so the voltage question is settled at the factory โ but only if you say it in the inquiry.
Put these ten items in your inquiry and you will get comparable, honest quotations โ and your civil engineer will thank you. Most are one line each, and they save a full round of clarification emails.
If your project is in the EU or follows EU practice, add: harmonized standards list, risk assessment summary, and the EU declaration of conformity aligned with Regulation (EU) 2023/1230. If it is North America, add: the CMAA class letter, ASME B30.2 inspection and load test duties, OSHA 1910.179 operating rules, and the rail and wind restraint verification.
It depends on the configuration and the destination market. North America: multiple-girder gantries are specified to CMAA 70, single-girder gantries usually follow CMAA 74 practice, and installed cranes are inspected under ASME B30.2 and operated under OSHA 29 CFR 1910.179, which names gantry cranes directly. Europe and most export markets: EN 15011 (bridge and gantry cranes) plus EN 13001 structural rules, with FEM 1.001 / ISO 4301 duty classification. Portable aluminum gantries at 0.25-2 tons sit outside full crane classification, but hoist and safe-use rules still apply. Name the configuration and standard family in the RFQ.
CMAA 70 covers top-running bridge and gantry cranes with multiple girders and a top-running trolley; CMAA 74 covers single-girder cranes, typically with an under-running trolley hoist on the bottom flange. Both classify into service classes A-F by load spectrum and cycles. As a rule of thumb, a double-girder gantry from 20 tons up belongs in the CMAA 70 world, while a single-girder gantry with a trolley hoist is specified on CMAA 74 practice.
Yes, both. ASME B30.2 covers overhead and gantry cranes with top-running bridge, single or multiple girder, and top-running trolley hoist, setting frequent and periodic inspection tiers, the annual comprehensive inspection and the 125% rated-load test. OSHA 29 CFR 1910.179 applies to overhead and gantry cranes in general industry and names gantry cranes directly. A US facility normally follows the ASME B30.2 inspection duties to satisfy OSHA.
Yes. Cranes placed on the European market must meet the essential safety requirements of the Machinery Directive 2006/42/EC, and from 20 January 2027 the Machinery Regulation (EU) 2023/1230, then carry the CE mark with an EU declaration of conformity. CE for a gantry crane is built on harmonized standards including EN 15011, EN 13001-1/2/3 and EN 60204-32. Ask for the declaration of conformity and the standards list; a CE claim without documents is not verifiable.
Match the class to real operating intensity. Occasional yard use: M3-M4 or Class B/C. Regular single-shift stockyard or workshop work: M4-M5 or Class C. Two-shift precast or production: M5-M6 or Class D. Continuous port or heavy mill duty: M7 and up or Class E/F. SIEC industrial gantry cranes cover 5-100+ tons, spans 5-40 m, lifting heights 6-20 m, duty A5-A8 standard, rail-mounted or rubber-tyred.
Roughly 15-25% for one meaningful jump at the same capacity and span. The upgrade buys deeper girders, heavier legs and end carriages, stronger wheels and drives, higher motor ratings and more cycle-rated components. On a 50-ton double-girder gantry at USD 75,000-120,000 FOB, an M5-to-M6 jump is roughly USD 11,000-30,000. The hoist and travel mechanisms are classified separately and should each carry an M-class on the quotation.
Send us your capacity, girder type, span, travel system and destination market โ our engineering team will confirm the applicable standard family, duty class, wind rating, wheel loads and certification documents before you commit. Quotes include a full specification sheet and structural data you can hand to your civil or structural engineer.
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