Crane Load Radius: Understanding Crane Capacity Charts

When it comes to lifting heavy loads, understanding the capacity of a mobile crane is crucial for safe and successful operations. One of the most important charts in this process is the load chart, which provides essential information about the crane's capabilities. However, with increasingly complex load charts, it can be overwhelming for operators and lift planners to decipher what they need to know.

Important Notes on Load Charts

Before diving into the load chart, it's essential to understand that you cannot assume a longer boom length is automatically safe. In fact, a shorter boom length may have a lesser rating. When the boom length or radius falls between printed values, you must select the least load-rated option.

Determining Crane Capacity

To determine how much load your crane can safely handle, you need to know two critical pieces of information: the length of the boom (hydraulic cranes display this on the top row) and the load radius of the suspended load (hydraulic cranes show this in a column on the left side). This will help you navigate the load chart and find the correct information.

Reeving Charts: Understanding Wire Rope Requirements

Reeving charts provide essential information about wire rope type and the number of parts required to lift specific loads. Make sure you understand these requirements, especially when lifting heavy loads exceeding 28,000 lbs.

Working Area Charts: Understanding Load Ratings

Working area charts define specific areas of the crane that relate to loading ratings. These include Over the Side, Over the Rear, Over the Front, and 360-degree Rotation, which lead you to specific load charts. Knowing these areas is crucial for selecting the correct lift configuration.

Boom and Jib/Extension Configurations

Before attempting a lift with an extension or jib, ensure you locate the load chart that provides ratings for these accessory devices.

Counterweight Installation and Crane Configuration

Don't forget to consider counterweight installation and crane configuration. Are the outriggers fully extended and set, partially extended and set, or will the lift be made on rubber tires?

Prioritizing Safety

To operate a mobile crane safely, you must obtain specific information prior to attempting a lift. Load charts have become increasingly complex, but understanding what you're looking for can help you navigate these charts effectively.

By following these guidelines, you'll be better equipped to calculate crane load capacity and ensure safe and successful lifting operations. Remember, understanding your crane's capabilities is crucial for avoiding accidents and ensuring the success of your project.

Crane load radius