Why Does the Lifting Capacity of a Spider Crane Change as the Lifting Radius Increases?

Why Does the Lifting Capacity of a Spider Crane Change as the Lifting Radius Increases?

When the lifting radius of a spider crane increases, the load creates a greater overturning moment on the equipment. To maintain lifting stability, the allowable lifting capacity must therefore decrease.

This means that a spider crane cannot be evaluated only by its rated maximum lifting capacity. The permitted load depends on the actual lifting radius and the equipment’s operating configuration.

Factors That Determine Actual Lifting Capacity

Before operation, the actual lifting capacity should be determined according to:

• The specific working conditions
• The outrigger configuration and support status
• The equipment-specific load chart

Confirm the Load Chart Before Operation

The actual load that can be lifted must always be checked against the load chart for the specific spider crane and operating condition. Onchtech recommends confirming the lifting plan and allowable capacity with technical personnel before operation to support safe and stable lifting.