How to Calculate Container Loading Capacity for Shipping Steel Coils

How to Calculate Container Loading Capacity for Shipping Steel Coils

Efficiently calculating container loading capacity is crucial for optimizing logistics costs when shipping steel coils internationally. Understanding how to maximize space while adhering to safety and weight limits can significantly impact your bottom line. Here's a practical guide to help you plan your shipments effectively.

Key Factors in Container Loading

Two primary constraints govern container loading: weight capacity and physical space.

Weight Limit: This is the most critical factor.

A standard 20-foot container (20DV) has a maximum payload of approximately 28 metric tons.

A 40-foot container (40DV) can typically carry up to 26.5 metric tons.

Physical Space: While coils are dense and often hit the weight limit before filling the space, the internal dimensions of the container determine how coils can be arranged. Proper blocking and bracing are essential to use space efficiently and prevent damage during transit.

A Simplified Calculation Method

The total number of coils is determined by the lower result from these two calculations:

Step 1: Weight-Based Calculation
Total Coils = (Container Weight Limit) / (Average Weight per Coil)

Step 2: Space-Based Calculation
This involves arranging coils within the container's floor area. Coils are typically stood on their edge. The number of coils per row is determined by the container width divided by the coil outer diameter (OD), and the number of rows is determined by the container length divided by the coil OD.

Example for a 20ft Container:

Let's assume you have coils with a 1500mm OD and an average weight of 3 tons each.

By Weight: 28 tons / 3 tons/coil = 9 coils (always round down).

By Space: A 20ft container's floor can typically fit 2 coils wide and 4-5 coils deep, allowing for 8-10 coils.

In this case, the weight limit is the binding constraint, allowing for a maximum of 9 coils.

Pro Tips for Safe and Efficient Loading:

Secure Coils Properly: Use wooden wedges, dunnage bags, and steel straps to prevent any movement.

Consider Coil Dimensions: Non-standard diameters or widths may reduce the total number of coils that can be safely loaded.

Distribute Weight Evenly: Balance the load across the container floor.

At Ruixiang Steel, our logistics team has extensive experience in optimizing container loads for steel coils. We provide expert loading plans and secure packaging to ensure your cargo arrives safely and cost-effectively, maximizing the value of every shipment.