When Is a Single Girder Overhead Crane the Right Choice?

A single girder overhead crane is suitable for many factories, warehouses, and maintenance areas. Deciding when to choose a single girder overhead crane requires considering the lifting task, duty class, headroom, and building conditions.

In What Scenarios Are Single Girder Overhead Cranes Typically Used?

Single girder overhead cranes are commonly used in machining, equipment maintenance, warehousing and logistics, assembly, and general structural steel fabrication. These applications share one common characteristic: material handling takes place within a defined crane coverage area.

What Types of Loads Are They Suitable for Lifting?

Load capacity is another key factor in deciding when to choose a single girder overhead crane, and these cranes are commonly used for loads of 20 metric tons or less.

Extra-long loads usually require special lifting attachments, such as lifting beams, clamps, vacuum lifters, or other specialized devices, to keep the load properly balanced. The weight and operating method of these attachments must also be considered during crane selection.

When to Choose a Single Girder Overhead Crane

• Routine material handling, equipment maintenance, or assembly within a workshop;
• Applications that do not require long-term, continuous lifting of loads close to the rated capacity.

If high-frequency or continuous material handling is required, or if the working environment involves metallurgical operations, high temperatures, or strong corrosion, it is necessary to compare single girder and double girder overhead cranes, as well as electric hoist and open winch trolley configurations, rather than determining the choice based solely on tonnage.

Why Do Similar Projects Use Different Configurations?

Single girder overhead cranes are available in many standardized configurations, but actual project designs still vary according to the factory layout and operating conditions.

If the daily operating frequency is moderate and the span and available headroom are relatively standard, a standard LD-type single girder overhead crane with an A3 duty class may meet the requirements.

If the available installation height is limited and greater hook height is required, a low-headroom electric hoist can be used to increase the actual hook height. The overall height of the crane can also be reduced by optimizing the main girder dimensions and rail position. This arrangement is commonly used in European-style single girder overhead cranes.

If the workshop requires frequent material handling, the motor, brake, travel mechanism, and control method should be adjusted to meet the required duty class.

What Factors Influence the Final Design?

• Factory layout: Required span, load-bearing capacity of the crane brackets and runway beams, and available installation space.
• Available headroom: Influences the actual hook height.
• Operating frequency: Daily operating hours, number of lifts per hour, and load factor determine the required duty class.
• Production process: Travel speed and positioning accuracy.
• Future planning: Possible future production expansion or the addition of new equipment.

Frequently Asked Questions

Can the Lifting Capacity of a Single Girder Overhead Crane Be Increased Later?

Generally, no. Increasing the lifting capacity requires recalculating the load-bearing capacities of the main girder, end beams, wheels, runway beams, and supporting structures, as well as replacing the hoist.

Can a Single Girder Overhead Crane Be Installed in an Existing Factory Building?

Yes, but the available installation height and the building’s load-bearing capacity must first be verified.

If the existing building cannot support the crane loads, independent support structures can be installed next to the existing building columns. However, this may reduce the available crane span.

What Factors Must Be Considered When Selecting a Single Girder Overhead Crane?

Girder structure: Conventional single girder design or European-style single girder design;

Hoisting mechanism: Electric chain hoist, electric wire rope hoist, or European-style wire rope hoist;

Speed control: Fixed-speed operation or variable-frequency speed control;

Gear motor brand: Chinese or international brands.

Summary

Understanding when to choose a single girder overhead crane requires considering the lifting task, duty class, headroom, and building conditions, although this crane type is suitable for many factories, warehouses, and maintenance areas.

Before requesting a quotation, it is recommended to prepare the following information: lifting capacity, span, required hook height, load type, daily operating hours, number of lifts per hour, factory layout drawings, and on-site photographs.

Based on this information, MOTCRANE can determine whether a standard single girder solution is appropriate or whether a low-headroom design, higher duty class, double girder crane, or another configuration is required.