Understanding Spreader Bars and Lifting Beams Role in Load Testing

At first sight, a spreader bar and a lifting beam may look like the same tool. But in reality, they are designed for different functions and operate differently. This article will help you better understand the differences between spreader bar and lifting beam and explain their respective roles in the load testing process.

What is a Spreader Bar?

A spreader bar is a lifting aid used to distribute a load evenly by spreading the lifting points using slings attached to both ends. This tool is typically used for:

• Reduce pressure on the load
• Maintain the load’s shape to prevent distortion
• Avoid excessively sharp angles in the sling

The spreader bar operates on a compression system, making it ideal for lifting long or wide loads

What is a Lifting Beam?

A lifting beam is a lifting device that serves as a direct link between a crane and a load, with the load suspended beneath the beam. Unlike a spreader bar, a lifting beam operates on a tension system and typically has a single main lifting point at the top.

Lifting beams are widely used for:

• Vertical lifting of heavy loads
• Confined spaces
• Use with a single-point crane hook

Functions in the Load Testing Process

During load testing, both the spreader bar and the lifting beam play a crucial role in ensuring that the lifting equipment operates in accordance with safety standards, such as:

1. In the field, loads are rarely lifted from a single point, so multiple lifting points with a specific load distribution are used. An authentic rigging configuration is required to simulate the actual load distribution and generate valid test data.

2. To control the load distribution so it is not concentrated at a single point, which could cause overload on a single structural component and lead to a risk of failure during the testing process.

3. Reducing the sling angle to prevent a significant increase in tensile force. The spreader bar keeps the sling angle small, while the lifting beam keeps the force vertical.

4. Helps protect the structure from the equipment being tested, especially for equipment sensitive to pressure or deformation, as the stress is distributed more evenly.

Examples of Equipment That Require a Spreader Bar or Lifting Beam During Load Testing

1. Crane (Mobile Crane, Overhead Crane): uses a spreader bar to ensure the load is not concentrated on the hook

2. Rigging gear (Shackle, Sling, Hook): uses a lifting beam to keep the force vertical

3. Spreader Frame or Modular Lifting System: uses an additional spreader bar to simulate real-world loads

4. Lifting Lug / Pad Eye: Use a spreader bar to distribute the load according to the design and test it with a multi-point configuration

Conclusion

Although they look similar, spreader bar and lifting beam serve important functions in the lifting industry and play a crucial role in the load testing process to ensure lifting equipment operates in accordance with safety standards.

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