In international shipping, overweight and overlength cargo exceed the weight and size standards for ordinary cargo, resulting in special requirements for transportation vehicles, loading and unloading equipment, port operations, and document declarations. They are also subject to various restrictions.
In this article, Weefreight will provide detailed answers and hope it will be helpful.
- Overweight Cargo Restrictions and Additional Requirements
Overweight cargo generally refers to cargo weight exceeding the rated load of the container (e.g., a 20-foot container is typically limited to 21-28 tons, depending on shipping company regulations), or the weight of a single piece of cargo exceeding the maximum load capacity of the port/shipping company’s loading and unloading equipment (e.g., some ports have a maximum lifting capacity of gantry cranes of 30 tons, which is considered overweight).
(I) Core Restrictions
Carrier Load Limitations: Containers and ship spaces vary across shipping companies. Some small feeder vessels or older ships may have lower load capacities per unit area on their bilges and decks than larger mainline vessels, making them unable to carry overweight cargo. Containers are marked with maximum loads (such as “MAX GROSS” on the doors). Overweight cargo can damage the container structure, and shipping companies have the right to refuse loading.
Port Loading and Unloading Capacity Limitations: If the destination or transit port lacks overweight cranes (such as quay cranes or floating cranes), cargo may not be unloaded. It is important to confirm the port’s maximum lifting capacity in advance. For example, some small African ports can only handle cargo under 20 tons. Overweight cargo must be transferred to a nearby larger port.
Road Transport Restrictions: After cargo arrives at a port, road transport to the destination is subject to road and bridge load restrictions in the countries/regions along the way. In some regions, an “Overweight Transport Permit” is required; otherwise, cargo may be detained.
(II) Additional Requirements
Advance Declaration and Confirmation: When booking, you must clearly state the unit weight and total weight of your cargo to the shipping company and provide an “Overweight Guarantee” (which guarantees the cargo weight is accurate and assumes liability for any equipment damage caused by overweight). The shipping company will allocate specific shipping space (such as the deck hold or near-bottom load-bearing area) based on the cargo weight to avoid impacting other cargo.
Packaging and Reinforcement Requirements: Overweight cargo requires high-strength packaging (such as thickened wooden crates or steel frames) to prevent damage from bumps and vibrations during transport. If the cargo directly contacts the container floor, non-slip mats and load-bearing wooden planks must be placed on the floor to distribute the weight and prevent damage.
Additional Fees: An “Overweight Surcharge” is required. The fee is charged per order or calculated based on the excess weight (e.g., 1-5 tons, 5-10 tons). If special overweight equipment (such as a floating crane) is required at the port, equipment rental fees will also be incurred.
II. Restrictions and Additional Requirements for Oversized Cargo
Oversized cargo generally refers to individual pieces of cargo exceeding the standard container dimensions (e.g., approximately 5.9 meters in a 20-foot container and approximately 12.03 meters in a 40-foot container), or cargo that requires the use of specialized containers (e.g., open-top containers or flat rack containers) and exceeds the length of the container (e.g., steel, large machinery, pipes).
(I) Core Restrictions
Ship Space and Hatch Size Restrictions: Ordinary container ships have limited width and height of cargo hatches. If oversized cargo cannot pass through the hatches, it can only be loaded on deck (confirmation with the shipping company is required to permit deck loading). Some ships have fixed spacing between deck beams. If oversized cargo exceeds this spacing, it may not be secured, posing a safety risk.
Port and Waterway Restrictions: Some ports have limited widths for quay cranes and yard access points. Loading and unloading oversized cargo requires adjusting equipment positions or even temporarily closing sections of the access points. If cargo must transit narrow waterways (such as sections of the Suez Canal or inland waterways), confirm the channel width and clearance height to avoid collisions between cargo and facilities on both sides of the channel.
Dimensional Restrictions During Transportation: If cargo is loaded in flat rack containers or open top containers and exceeds the container length, consider the impact of wind and waves on the cargo during sea transportation (oversized portions are susceptible to wind and wave impacts). Furthermore, port pilots in some countries will request detailed cargo dimensions to avoid disruptions to ship maneuverability caused by oversized cargo during pilotage.
(II) Additional Requirements
Booking and Container Selection: It is important to select specialized containers that can accommodate oversized cargo (such as 45-foot flat rack containers or custom extended open top containers). Provide the shipping company with the exact length, width, and height of the cargo, as well as a loading diagram (indicating the fixed position of the cargo on the container) when booking. Some shipping companies only accept oversized cargo on specific routes, so confirm route feasibility in advance.
Securing and Protective Measures: Cargo must be secured to the container or deck using high-strength ropes (such as wire rope) and clips. The securing points should be evenly distributed to prevent shifting during transport. Exposed portions should be covered with crash pads or tarpaulins (for moisture-sensitive cargo) to protect them from seawater and salt.
Documentation and Compliance Requirements: The “overlength” nature and specific dimensions of the cargo must be clearly marked on the bill of lading and packing list. Some countries (such as the United States and Brazil) require an “Overlength Cargo Transport Declaration” to explain the cargo’s securing methods and safety measures. If the overlength of the cargo necessitates special routing (such as bypassing narrow waterways), this must be reported to the shipping company and port authorities in advance.
Additional Costs: An “overlength surcharge” will be charged, increasing with the excess length. If specialized containers are used, the rental fee will be higher than for standard containers. In some cases, due to the inefficient loading and unloading of overlength cargo, port demurrage may also be incurred (if loading and unloading time exceeds the agreed time).
- Common Considerations
Whether it’s overweight or overlength cargo, you must confirm details with the shipping company, freight forwarder, and port in advance—for example, the exact weight/dimensions of the cargo, the availability of loading and unloading equipment, and the land transportation connection plan at the destination port—to avoid cargo detention or refusal due to information discrepancies. Additionally, you must purchase sufficient freight insurance based on the characteristics of the cargo to cover losses caused by special transportation risks (such as equipment damage and cargo displacement).
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