Introduction
Single Girder EOT (Electric Overhead Travelling) Cranes are widely used for lifting, lowering, and horizontally moving materials within industrial facilities. Their relatively compact construction, efficient use of overhead space, and adaptable design make them suitable for a broad range of material-handling applications.
WSP Cranes & Services offers Single Girder EOT Cranes engineered for dependable material handling across manufacturing plants, engineering workshops, fabrication units, warehouses, steel and metal industries, process plants, and other industrial environments. The cranes can be configured according to required lifting capacity, span, lifting height, duty requirements, operating conditions, and available runway arrangement.
As a manufacturer and supplier of industrial lifting equipment, WSP focuses on combining structural strength, reliable hoisting components, controlled crane movement, and practical maintenance requirements. The result is a crane solution designed to provide smooth operation, operational safety, and consistent performance over its service life.
What Is a Single Girder EOT Crane?
A Single Girder EOT Crane is an overhead travelling crane in which the bridge consists primarily of one main horizontal girder supported by end carriages. The hoisting unit travels along the girder, while the complete bridge travels along runway rails installed within the facility.
The three principal movements are:
- Hoisting: Raising and lowering the load.
- Cross Travel (CT): Moving the hoist along the crane girder.
- Long Travel (LT): Moving the complete crane bridge along the runway.
Electrical controls coordinate these movements to allow operators to position loads accurately within the designated working area.
Single Girder EOT Cranes are generally selected where the required lifting capacity and duty do not require the additional structural arrangement of a double-girder crane. Their comparatively lightweight bridge construction can also help reduce the load imposed on the supporting structure and runway system.
Single Girder EOT Crane Technical Specifications
| Parameter | Technical Specification |
|---|---|
| Capacity | 250 kg – 20 Ton |
| Span | Up to 50 m |
| Height of Lift (HOL) | Up to 30 m |
| Design Standards | IS 3177 / IS 807 |
| Crane Type | Single Girder EOT |
| Operation | Pendant / Radio Remote / Combined Mode |
| Drive Control | VFD-controlled Hoist / CT / LT |
| Power Feeding | Shrouded DSL / Festoon System |
Final crane configuration and component selection are determined according to the application, load characteristics, duty classification, operating environment, runway arrangement, and project requirements.
Key Features of WSP Single Girder EOT Cranes
1. Optimized Girder Design
The crane girder is designed to achieve the required structural strength while maintaining controlled deflection. Depending on the application and design requirements, WSP can use rolled or fabricated girder arrangements.
An optimized girder design helps balance structural performance, crane weight, available headroom, and operational requirements. Properly designed girders also contribute to smooth trolley movement and long-term structural reliability.
2. High-Duty Hoisting System
The hoisting system is selected to provide dependable lifting and lowering performance. WSP's specified hoisting solution includes Carl Stahl Craftsman WRH equipment, with high-duty configurations aligned with applicable FEM/ISO classifications.
The hoisting arrangement can be configured according to factors such as lifting capacity, lifting height, operating frequency, duty cycle, and required lifting speed.
3. VFD-Controlled Drive System
Variable Frequency Drive (VFD) control is provided for the hoist, cross-travel, and long-travel movements where specified.
VFD-based movement allows controlled acceleration and deceleration, helping reduce sudden load movement and mechanical shock. It can also provide improved positioning control during material handling operations.
4. Precision-Machined End Carriages
The end carriages support the bridge girder and provide the interface between the crane structure and runway system. Precision-machined components and hardened travelling wheels are used to support reliable crane movement and reduce unnecessary wear.
Proper alignment of the end carriages and travelling wheels is important for smooth long-travel operation and consistent load distribution.
5. Helical/Hardened Gearbox
The travel mechanism can incorporate helical or hardened gearboxes designed for high torque transmission and reliable operation.
A suitable gearbox arrangement helps provide the torque required for starting and moving the crane or trolley while maintaining controlled operation and reduced operating noise.
6. Fail-Safe Braking System
The crane can be equipped with fail-safe electromagnetic or electro-hydraulic braking systems according to the application and equipment configuration.
The braking arrangement is an important part of the crane's safety system, helping control and stop crane movements when required. Brake selection is made according to the relevant mechanism, load, speed, duty, and design requirements.
7. Flexible Control Options
WSP Single Girder EOT Cranes can be configured with different operator control arrangements, including:
- Pendant control
- Radio remote control
- Combined pendant and radio remote operation
The appropriate control method depends on the operating environment, visibility requirements, crane layout, and operator preferences.
8. Reliable Power Feeding
Power can be supplied to the crane through a shrouded DSL system or festoon system, depending on the runway arrangement and project requirements.
A properly selected power-feeding system helps provide continuous electrical supply while accommodating the travelling movement of the crane.
How Does a Single Girder EOT Crane Work?
The operation of a Single Girder EOT Crane involves coordinated movement between the hoisting mechanism, trolley, and crane bridge.
- Step 1 – Lifting the Load: The hoist raises the load using the selected lifting mechanism, wire rope, hook, and associated components.
- Step 2 – Cross Travel: The hoist or trolley moves along the main girder to position the suspended load at the required location.
- Step 3 – Long Travel: The crane bridge travels along the runway rails to move the load to another position within the operating area.
- Step 4 – Load Positioning: The operator uses the crane controls to coordinate hoisting, cross travel, and long travel for accurate placement.
- Step 5 – Lowering: The hoist lowers the load in a controlled manner until it reaches the intended position.
The combination of these movements allows a Single Girder EOT Crane to cover a large working area without requiring floor-mounted material-handling equipment for every lifting operation.
Major Components of a Single Girder EOT Crane
A complete EOT crane consists of several mechanical, electrical, and structural components working together.
- Main Girder
- The main girder forms the primary bridge structure of the crane. It carries the hoisting trolley and transfers the operating loads to the end carriages.
- End Carriages
- End carriages are mounted at both ends of the main girder and contain the travelling wheels and drive arrangement required for long-travel movement.
- Hoist and Trolley
- The hoist provides vertical lifting and lowering. The trolley carries the hoisting equipment and travels along the crane girder.
- Wire Rope and Hook Assembly
- The wire rope transmits the lifting force between the hoisting mechanism and the load hook. The hook assembly provides the connection between the crane and the lifting attachment or load.
- Long-Travel Mechanism
- The LT mechanism moves the complete crane bridge along the runway. It generally includes drive motors, gearboxes, wheels, shafts or coupling arrangements, and associated controls.
- Cross-Travel Mechanism
- The CT mechanism moves the hoist/trolley across the crane span.
- Braking System
- Brakes control and stop the relevant crane movements. Brake specifications depend on the mechanism and design requirements.
- Electrical Control Panel
- The control panel houses the electrical control and protection equipment required to operate the crane's motors and associated systems.
- Power Feeding System
- The power-feeding arrangement supplies electrical power to the moving crane and may use shrouded DSL or festoon systems.
- Operator Controls
- Pendant stations, radio remote controls, or combined systems can be used to control crane movements.
Applications of Single Girder EOT Cranes
Single Girder EOT Cranes can be used in a wide range of industrial and commercial material-handling applications.
- Manufacturing Plants
- Used for handling raw materials, components, machinery parts, finished products, and maintenance equipment.
- Engineering Workshops
- Suitable for moving heavy components and assemblies during manufacturing, fabrication, servicing, and maintenance activities.
- Fabrication Units
- Can assist with handling steel structures, fabricated components, plates, sections, and assemblies.
- Warehouses
- Used for loading, unloading, positioning, and transferring heavy materials where suitable overhead infrastructure is available.
- Steel and Metal Industries
- Can be configured for material handling involving steel products, components, tools, and production-related loads, subject to the applicable crane duty and environmental conditions.
- Process Plants
- Overhead cranes can support maintenance and material-handling activities in process industries where lifting equipment is required within defined work areas.
- Maintenance Facilities
- They can be used to handle motors, pumps, gearboxes, machinery components, and other equipment during installation or maintenance.
Advantages of Single Girder EOT Cranes
- Efficient Overhead Material Handling
- The crane moves loads above the floor, helping keep floor-level working areas available for production, storage, and transportation activities.
- Compact Structural Arrangement
- The single-girder configuration can provide a practical solution where the required capacity and operating conditions are suitable for a single-girder design.
- Reduced Dead Weight
- Compared with heavier crane configurations designed for higher capacities and demanding duties, a suitable single-girder arrangement can reduce the overall bridge weight.
- Flexible Configuration
- Capacity, span, lifting height, travel speeds, control system, power feeding, and other parameters can be selected according to the application.
- Controlled Operation
- VFD-controlled movements can provide smoother acceleration and deceleration, supporting more controlled load handling.
- Practical Maintenance
- Accessible and appropriately selected components can simplify routine inspection, servicing, and maintenance activities.
- Wide Industrial Application
- The configuration can be adapted for numerous manufacturing, fabrication, warehouse, engineering, and maintenance applications.
Single Girder vs Double Girder EOT Crane
The choice between single-girder and double-girder construction depends on capacity, span, lifting height, duty classification, headroom, operating conditions, and project requirements.
| Factor | Single Girder EOT Crane | Double Girder EOT Crane |
|---|---|---|
| Main Bridge | One main girder | Two main girders |
| Typical Application | Light to medium-duty applications | Higher-capacity and heavier-duty applications |
| Structural Weight | Generally lower | Generally higher |
| Installation Requirements | Often simpler for suitable applications | More substantial structure may be required |
| Headroom | Can be advantageous depending on hoist configuration | Depends on trolley and crane design |
| Capacity Selection | Suitable where application requirements permit | Preferred for applications requiring higher capacities or demanding duties |
| Cost Consideration | Often economical for suitable applications | Higher structural and equipment requirements may apply |
The final selection should always be based on an engineering assessment rather than capacity alone.
Factors to Consider Before Selecting a Single Girder EOT Crane
Choosing the correct EOT crane requires consideration of the complete operating environment.
- Load Capacity
Determine the maximum working load that the crane must safely lift. The selected crane capacity should account for the actual lifting requirements and applicable design considerations. - Crane Span
The span is the distance between the runway rail centres. The available building width and required coverage should be evaluated before finalizing the crane dimensions. - Height of Lift
Height of Lift (HOL) determines the required vertical lifting capability. Building height, roof structure, clearances, and required hook height should be considered. - Duty Classification
The frequency and intensity of crane operation influence the selection of hoist, motors, brakes, gearbox, and other components. - Operating Environment
Temperature, dust, moisture, corrosive conditions, outdoor exposure, hazardous areas, and other environmental factors can affect component selection and protection requirements. - Available Headroom
Available distance between the building structure, runway level, and required hook position is important when selecting the hoist and crane arrangement. - Control Method
Pendant, radio remote, or combined controls can be selected according to operator visibility, working conditions, and site requirements. - Travel and Lifting Speeds
Required lifting, cross-travel, and long-travel speeds should be determined based on productivity and load-positioning requirements. - Power Supply
The available electrical supply and runway configuration should be considered when selecting the power-feeding arrangement. - Maintenance and Serviceability
The availability of spare parts, inspection access, maintenance procedures, and service support should be considered for long-term crane operation.
Design Standards: IS 3177 and IS 807
WSP's Single Girder EOT Cranes are designed with reference to IS 3177 and IS 807, as specified for the crane application.
IS 3177 is associated with the Code of Practice for Electric Overhead Travelling and Gantry Cranes, while IS 807 provides requirements and guidance relating to the design and construction of cranes and lifting appliances.
The applicable standards, design calculations, component specifications, safety provisions, and inspection requirements should be established according to the specific crane configuration and project requirements.
Safety Considerations for Single Girder EOT Cranes
Safe crane operation depends on proper engineering, installation, inspection, maintenance, and trained operation.
Important practices include:
- Do not exceed the rated crane capacity.
- Inspect hooks, wire ropes, brakes, wheels, and other critical components regularly.
- Ensure the runway and supporting structure are suitable for the crane loads.
- Keep the operating area clear of unnecessary personnel and obstructions.
- Use appropriate lifting accessories for the load.
- Avoid side pulling and uncontrolled load movement.
- Follow the manufacturer's operating and maintenance instructions.
- Ensure operators are properly trained and authorized.
- Conduct periodic inspections and maintenance according to the applicable requirements.
- Investigate unusual noise, vibration, brake performance, or other abnormal operating conditions promptly.
Safety requirements should be established according to the crane design, applicable standards, site conditions, and relevant statutory requirements.
Maintenance of Single Girder EOT Cranes
Regular maintenance helps preserve crane performance and identify developing problems before they result in equipment failure.
A maintenance program should consider:
- Mechanical Inspection:
- Check wheels, gearboxes, couplings, shafts, bearings, wire ropes, hooks, and structural connections.
- Electrical Inspection:
- Check motors, control panels, cables, limit switches, VFDs, electrical connections, and protection devices.
- Brake Inspection:
- Verify brake condition, adjustment, response, and wear according to the manufacturer's requirements.
- Wire Rope and Hook Inspection:
- Check for wear, deformation, corrosion, damage, and other conditions requiring attention.
- Structural Inspection:
- Examine the girder, end carriages, welded or bolted connections, and other structural components.
- Lubrication:
- Lubricate components according to the equipment manufacturer's recommended intervals and lubricant specifications.
- Operational Testing:
- Check hoisting, cross travel, long travel, braking, control functions, and safety devices during scheduled inspections.
The exact maintenance frequency should be established based on crane duty, operating hours, environment, manufacturer's recommendations, and applicable regulations.
Why Choose WSP Cranes & Services?
WSP Cranes & Services focuses on engineering and supplying industrial crane solutions based on the specific requirements of each application. Its Single Girder EOT Crane range combines structural design, hoisting technology, controlled drive systems, and practical operator controls.
The technical configuration can be developed around factors such as:
- Required lifting capacity
- Span and runway dimensions
- Height of lift
- Duty classification
- Operating frequency
- Lifting and travelling speeds
- Available headroom
- Building structure
- Environmental conditions
- Control requirements
- Power-feeding arrangement
- Maintenance considerations
This application-focused approach helps ensure that the crane is selected and configured for its intended working conditions rather than relying on a one-size-fits-all design.
Frequently Asked Questions About Single Girder EOT Cranes
What is a Single Girder EOT Crane?
A Single Girder EOT Crane is an electrically powered overhead travelling crane with one main bridge girder. A hoist travels along the girder while the complete bridge moves along runway rails to transport loads across the working area.
What capacity range is available?
The specified WSP Single Girder EOT Crane range covers 250 kg to 20 Ton, depending on the application and required configuration.
What is the maximum span?
The specified maximum span is up to 50 metres, subject to structural design, building conditions, crane capacity, and project requirements.
What is the maximum height of lift?
WSP's specified Height of Lift (HOL) is up to 30 metres, depending on the required crane configuration.
Which standards are used?
The technical specification provided for these cranes references IS 3177 / IS 807. The applicable design and compliance requirements should be confirmed for each individual project.
What controls are available?
The crane can be configured with pendant control, radio remote control, or combined control.
Can the crane use VFD control?
Yes. The specified drive system includes VFD-controlled hoist, cross-travel, and long-travel movements, where applicable to the selected configuration.
Where are Single Girder EOT Cranes used?
They are commonly used in manufacturing plants, engineering workshops, fabrication units, warehouses, steel industries, process plants, maintenance facilities, and other locations requiring overhead material handling.
How do I select the right EOT crane?
Start by defining the maximum load, span, height of lift, duty cycle, operating environment, available headroom, travel requirements, control method, and building/runway conditions. A crane manufacturer or qualified engineer can then determine the appropriate configuration.
Conclusion
A Single Girder EOT Crane can provide an efficient and versatile overhead material-handling solution when its capacity, span, lifting height, duty, structural arrangement, and operating environment are properly matched to the application.
Choose WSP Cranes & Services offers Single Girder EOT Crane solutions with a specified capacity range of 250 kg to 20 Ton, spans of up to 50 m, and Height of Lift of up to 30 m, with designs based on IS 3177 / IS 807. Features such as optimized rolled or fabricated girders, Carl Stahl Craftsman WRH hoisting systems, VFD-controlled movements, precision-machined end carriages, hardened wheels, helical/hardened gearboxes, fail-safe brakes, flexible controls, and shrouded DSL or festoon power feeding provide a comprehensive basis for industrial crane applications.
For the correct crane selection, the final configuration should be determined from the actual load characteristics, operating duty, building and runway conditions, lifting requirements, and applicable design and safety requirements.
Applications
Fabrication Units
Machining Shops
Assembly Lines
Warehouses
Foundries
