How to Choose Between Single Girder and Double Girder Overhead Cranes?

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double girder overhead crane for sale

- Single girder overhead cranes: Suitable for small-to-medium tonnage, standard operating conditions, applications with moderate lifting height requirements, and scenarios where the budget is relatively limited.
- Double girder overhead cranes: Suitable for large tonnage, long spans, high duty classes, significant lifting heights, as well as heavy-duty and high-frequency operations.

Double girder overhead crane is the preferred choice in the following situations:
1. High lifting capacity: Especially for heavy-duty lifting requirements exceeding 20 tons.
2. Large span: When higher requirements are placed on the rigidity and structural strength of the main girders.
3. High lifting height: When greater working space is required for the crane hook.
4. High duty class: For operations involving frequent use, such as those classified as A5, A6, or A7.
5. High operating speed: When fast lifting, trolley travel, and bridge travel speeds are necessary.
6. Special configuration requirements: Such as dual trolleys, rotating hooks, maintenance platforms, or specialized lifting attachments.
Typical application scenarios for double girder overhead cranes:
- Iron and steel/metallurgical industry
- Heavy machinery manufacturing
- Foundries
- Large-scale assembly workshops
- Handling of steel coils, metal plates, and large-scale equipment

Double Girder overhead crane Manufacturer

Selecting an overhead crane should never be based on lifting capacity alone. Buyers of overhead cranes should evaluate the following technical factors before making a decision.
1. overhead crane Lifting Capacity
Determine the maximum load to be lifted, including the weight of any lifting attachments or handling devices. The crane must be designed to safely handle the required working load.
Lifting capacity alone does not dictate whether a single-girder or double-girder design is required. For example, a 10-ton overhead crane can be designed as either a single-girder or a double-girder unit. The choice depends on factors such as the span, duty classification, lifting height, and structural calculation results.
2. Span and Lifting Height
The crane span must correspond to the distance between the runway rails. Additionally, the required hook travel and the available clearance within the building must be considered to ensure sufficient space for lifting operations.
3. Duty Classification and Operating Frequency
The duty classification (working class) should reflect the expected operating hours, load spectrum, and number of lifting cycles. Applications involving frequent operation and heavy loads may require a crane designed for a higher duty class.

Duty Class	Examples of Operating Conditions
A3–A4	Low frequency, light loads, or general handling
A5	Moderate frequency, general production tasks
A6	Relatively frequent production tasks
A7–A8	High frequency, heavy-duty, or continuous operations

It is a misconception that single-girder cranes are limited to an A5 duty class and that only double-girder cranes can reach A6 or higher; the appropriate classification must be determined based on the specific design of the crane and the applicable standards. 
4. Building Structure and Wheel Loads
The crane's self-weight and maximum wheel loads must be checked against the load-bearing capacity of the runway beams, columns, and foundations. This is particularly important when installing a double girder overhead crane in an existing workshop.
5. Future Operational Requirements
Consider potential changes in production capacity, lifting equipment, automation, and material handling processes. Selecting a suitable crane configuration from the beginning can help reduce future modification costs.

As a professional overhead crane manufacturer, Weihua provides customized single girder and double girder overhead crane solutions for a wide range of industrial applications.
With extensive manufacturing experience and engineering capabilities, Weihua offers crane systems designed according to customers' specific lifting requirements, workshop conditions, and applicable standards.
From general-purpose single girder cranes to heavy-duty double girder systems, Weihua focuses on structural reliability, operational safety, lifting precision, and long-term performance.
Not sure which overhead crane is right for your project?
Contact Weihua's engineering team and provide your lifting capacity, crane span, lifting height, working class, and application details. Our specialists will help evaluate your requirements and recommend a suitable overhead crane solution.

Weihua – Professional overhead crane Manufacturer in China.