Sep. 23, 2026
A gantry crane manufacturer needs accurate site measurements before designing a safe and efficient lifting system. A small error in the lifting height can reduce usable space, while an incorrect load capacity can affect safety and cost. The first step is to check the crane span, because it must match the working area and travel path.
Good planning also requires information about the runway surface, power supply, and nearby structures. These details help define the correct gantry crane dimensions and wheel arrangement. A mobile gantry crane may need different measurements from a rail-mounted gantry crane.
Before contacting Lihua or another supplier, prepare a simple site drawing with all key dimensions. Include the load size, lifting points, and travel direction. This information makes it easier to select the right electric hoist and control system.
Many ordering problems start with one missing measurement. The crane may lift the load but fail to move it through a doorway, under a roof, or across an uneven floor.
This guide explains the five site measurements that affect design, quotation, installation, and daily operation. It also shows how to check each measurement before ordering a gantry crane.
Before ordering a gantry crane, measure the maximum load and load dimensions, required lifting height, working span, travel distance, and site clearance. Also record floor conditions, wind exposure, power access, and installation limits. Give these measurements to the gantry crane manufacturer so the crane can be designed with the correct span, rated load, wheel system, hoist, and safety devices.
The rated capacity of a gantry crane must cover the heaviest load that will be lifted. Do not use the average load as the design value. Record the maximum load, normal load, load length, load width, load height, and lifting points.
Include the weight of slings, spreader beams, lifting clamps, magnets, hooks, and other attachments. For example, a 10 tonne machine lifted with a 0.6 tonne spreader beam creates a total lifted load of at least 10.6 tonnes before any design allowance is considered.
A gantry crane rated at 10 tonnes should not be used to lift a 10 tonne load plus a 0.6 tonne lifting beam. The crane manufacturer may recommend the next standard capacity, such as 12.5 tonnes, depending on the duty class and local rules.
| Information | Example value | Why it matters |
|---|---|---|
| Maximum load | 10 tonnes | Sets the rated lifting capacity |
| Lifting attachment | 0.6 tonnes | Must be included in the total lifted weight |
| Load length | 4.2 meters | Affects hook position and clear span |
| Load width | 2.1 meters | Affects leg clearance and travel path |
| Lifting frequency | 20 lifts per hour | Helps define the duty classification |
An off-center load can create side forces and uneven wheel pressure. Mark the true center of gravity on the site drawing. If the load must be turned, include the turning radius and the space needed for the operator.
Measure the full vertical distance from the floor to the highest point where the load must be placed. Then measure the lowest overhead obstruction. These two values define the usable lifting height and the available headroom.
The usable hook height is not the same as the crane beam height. A typical calculation is:
Required hook height = placement height + load height + lifting attachment height + operating clearance
For example, if the load must reach 6 meters, the load is 2 meters high, the lifting attachment is 1 meter high, and the required clearance is 0.3 meters, the hook must reach at least 9.3 meters.
A low-headroom electric hoist may be needed when the roof is low. A standard wire rope hoist may require more space above the crane girder. Ask the manufacturer for the hook approach dimension, which is the distance between the hook center and the nearest obstruction.
| Vertical item | Example measurement | Design effect |
|---|---|---|
| Required placement height | 6.0 meters | Sets the minimum hook reach |
| Load height | 2.0 meters | Uses part of the lifting range |
| Sling and beam height | 1.0 meter | Reduces available hook height |
| Operating clearance | 0.3 meters | Reduces collision risk |
| Lowest obstruction | 10.0 meters | Limits the crane beam and hoist position |
The crane span is the distance between the centerlines of the two legs or wheels. It is not always the same as the building width. Measure the work zone, the load width, and the required side clearance.
A gantry crane should not be ordered using only the building width. If a building is 20 meters wide, the usable crane span may be smaller because of columns, safety zones, or equipment near the walls.
Measure the distance between the crane legs and nearby objects. Include a safe operating gap based on the applicable local regulations and risk assessment. Lihua can use this information to recommend a standard gantry frame, adjustable legs, or a custom leg arrangement.
| Site feature | Measurement to take | Possible crane decision |
|---|---|---|
| Building width | 20 meters | Shows the total available space |
| Required work width | 16 meters | Sets the practical crane span |
| Load width | 2.1 meters | Confirms leg and hook clearance |
| Wall to leg distance | 1.2 meters | Helps prevent contact with walls |
| Door opening | 5 meters wide by 5 meters high | Limits transport and installation options |
The travel path determines the length of the gantry crane runway and the type of wheel system. Measure the full distance from the first lifting position to the last lifting position. Do not measure only the distance between two regular workstations.
Rail-mounted gantry cranes need a straight and level rail path. Rubber-tired gantry cranes need a suitable floor surface and enough turning space. A portable gantry crane may use adjustable wheels, but the rated capacity can change when the crane is moved or set on an uneven surface.
Ask a qualified building or civil engineer to verify the floor bearing capacity when the crane creates high wheel loads. The manufacturer needs the maximum wheel load, floor type, slab thickness, reinforcement details, and foundation condition.
Measure floor level at intervals of 3 to 5 meters, or at every visible joint and change in elevation. A difference of only a few millimeters can affect wheel tracking and side loading. The final acceptable tolerance must be confirmed by the crane designer and the applicable installation standard.
| Floor condition | Recommended check | Why it matters |
|---|---|---|
| Concrete slab | Thickness, strength, cracks, and reinforcement | Confirms support for wheel loads |
| Steel rail | Gauge, straightness, level, and joint condition | Supports stable crane travel |
| Outdoor ground | Drainage, settlement, and bearing capacity | Reduces sinking and wheel misalignment |
| Floor joint | Width, height difference, and location | Prevents impact during travel |
Clearance and utilities are often missed during the first site visit. Measure the space above, below, and beside the crane. Also record wind conditions if the gantry crane will operate outdoors.
Use a laser distance meter for height and span checks. Confirm important dimensions with a tape measure. Record each measurement with the date, location, and measuring tool used. A site drawing should show at least one fixed reference point.
Outdoor cranes need information about local wind speed, rain, temperature, and ground drainage. Record the normal operating wind speed and the maximum site wind speed from local weather or engineering data. The crane may need rail clamps, storm anchors, wheel brakes, or an anemometer.
Do not operate a crane above the wind limit stated in the operating manual. The design wind load, parked wind load, and anchoring method must be confirmed before fabrication.
Record the available voltage, frequency, phase, and connection point. Common industrial supplies include 380 V, 400 V, or 415 V at 50 Hz, but the actual site supply must be verified. The crane manufacturer may need to provide a main isolator, festoon cable, cable reel, conductor bar, or wireless control system.
| Utility or condition | Information required | Typical design response |
|---|---|---|
| Electrical supply | Voltage, frequency, phase, and available current | Selects motors, panels, and protection devices |
| Outdoor wind | Operating and parked wind speed | Defines brakes, clamps, and anchoring |
| Lighting | Light position and height | Prevents contact with the hoist or load |
| Pedestrian traffic | Walkway position and crossing points | Supports guarding and control planning |
| Emergency access | Exit routes and service space | Protects operators and maintenance staff |
Use the following process to reduce design changes and installation delays.
Accurate measurements are only useful when they are included in the technical specification. The quotation should identify the rated load, lifting height, span, travel length, hoist type, motor power, control method, wheel load, and duty classification.
Ask which standards will apply to the crane. Common references include ASME B30.2 for overhead and gantry cranes, EN 15011 for bridge and gantry cranes, ISO 4301 for crane classification, and IEC 60204-32 for electrical equipment used on lifting machines. The final requirements depend on the country, industry, and contract.
Request documented checks for steel plate thickness, weld quality, dimensional accuracy, electrical insulation, motor operation, brake performance, limit switches, emergency stop function, and overload protection.
| Inspection item | Example verification | Record to request |
|---|---|---|
| Steel structure | Material certificates and dimensional inspection | Inspection report and material records |
| Welds | Visual inspection and non-destructive testing when specified | Welding and test reports |
| Hoist and trolley | No-load and rated-load operation | Functional test record |
| Brakes | Holding and stopping performance | Brake test record |
| Safety devices | Limit switches, emergency stop, and overload limiter | Safety function checklist |
| Load test | Test load based on the governing standard or contract | Signed load test certificate |
Ask the gantry crane manufacturer how many similar cranes it has designed, built, and commissioned. Request details such as crane capacity range, maximum span, outdoor installations, control systems, and service support. Lihua can review the site data and prepare a crane layout that matches the lifting task and available space.
Do not approve production from a basic price sheet alone. Review the general arrangement drawing, foundation or floor requirements, power layout, shipping dimensions, installation sequence, spare parts list, and operator training plan.
The five key measurements before ordering a gantry crane are the maximum load and load size, required lifting height, working span, travel distance, and site clearance. Floor strength, wind exposure, power supply, and access conditions must also be recorded. Accurate data helps a gantry crane manufacturer select the correct structure, electric hoist, wheel system, controls, and safety devices. By completing a detailed site survey before requesting a final quotation, you can reduce redesign costs, installation delays, and safety risks. Lihua can use the completed measurements to develop a gantry crane that fits the site and supports reliable daily lifting.
