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The goods transported by sea usually have the characteristics of large volume, overweight, irregular shape, or special transportation requirements, which exceed the conventional transportation capacity of ordinary cargo ships. The following are specific classifications and common types of goods:

1. Divided by physical attributes
1. Overweight goods (weight dimension)
Definition: The weight of a single cargo exceeds the conventional carrying capacity of a regular cargo ship or port loading and unloading equipment (usually a single weight ≥ 50 tons, with different ship/port standards).
Common goods:
Large industrial equipment: such as generator sets (single unit can reach hundreds of tons), refinery reaction towers, and pressure vessels in nuclear power plants.
Heavy machinery: shield tunneling machines (used for tunnel construction, with a single weight exceeding 1000 tons), mining crushers.
Ship components: ship main engine, large anchor chain, marine engineering module (such as drilling platform segmentation).
2. Overlimit goods (size dimension)
Definition: The length, width, and height of the goods exceed the capacity of a regular container or cabin, or require the occupation of multiple cabin/deck spaces during transportation.
Common goods:
Wind power generation equipment: wind turbine blades (length 60-100 meters), tower (diameter 4-6 meters, height over 100 meters).
Bridge components: prefabricated bridge sections (such as the immersed tube tunnel section of the Hong Kong Zhuhai Macao Bridge, approximately 180 meters long), large steel arch structures.
Special vehicles: giant mining trucks (length x width x height up to 15 x 8 x 7 meters), large construction vehicles.

2.Divided by industry application
1. Goods in the energy industry
Offshore wind power equipment: wind turbine host, hub, blade, offshore substation module.
Petrochemical equipment: offshore drilling platforms (such as semi submersible platform sections), LNG storage tanks (diameter over 10 meters, length over 50 meters), prefabricated sections of oil pipelines.
Nuclear power equipment: reactor pressure vessels, steam generators (with a single weight exceeding 300 tons).
2. Infrastructure and engineering goods
Bridge and tunnel components: steel box girders for cross sea bridges, immersed tube tunnel sections, and prefabricated large bridge piers.
Port machinery: shore container cranes (shore cranes, height over 50 meters, weight over 1000 tons), port loading and unloading equipment.
Water conservancy engineering equipment: dam gates (width exceeding 20 meters), large water pump units.
3. Ship and ocean engineering cargo
Ship segmentation: The hull segmentation of large cruise or cargo ships (such as bow and stern modules, weighing hundreds to thousands of tons).
Marine engineering structures: offshore platform conduit racks, deep-sea mining equipment, and underwater cable laying machinery.
4. Heavy machinery and industrial equipment
Metallurgical equipment: blast furnace body of iron and steel plant, memorial archway of steel rolling mill (weighing more than 200 tons).
Cement production line: rotary kiln (diameter 5-6 meters, length over 100 meters), ball mill.
Special vehicles: large shield tunneling machines, space launch carrier transport vehicles.

3.Divided by transportation specificity
1. Irregular shaped goods
Characteristic: Non standard geometric shape, customized support or fixing scheme is required during transportation.
Example: Large sculpture artworks, irregular steel structure building modules, aircraft fuselage (irregular components during disassembly and transportation).
2. High value or precision goods
Characteristics: The goods have extremely high value or strict precision requirements, and risks such as vibration and tilting need to be controlled during transportation.
Example: Large astronomical telescope lenses (requiring shock resistant transportation), semiconductor manufacturing equipment (error requirement ≤ 0.1 millimeters).
3. Dangerous goods and large items
Characteristic: It belongs to both large cargo and dangerous goods, and must meet the dual transportation regulations.
Example: Large storage tanks for loading flammable and explosive liquids, and containers for transporting radioactive materials (must comply with IMDG Code requirements).

4.Judgment standards in international shipping
International shipping organization definition: Institutions such as the International Chamber of Shipping (ICS) typically use the weight (≥ 50 tons) or size (length ≥ 12 meters, width ≥ 4 meters, height ≥ 3 meters) of goods as a reference standard for the transportation of large cargo, but specific adjustments need to be made based on the ship's carrying capacity and port operating conditions.
Differences in regulations among countries: For example, the European Union has clear regulations on oversized standards for road/sea freight (such as requiring special permits for widths greater than 3.5 meters), while countries such as the United States and China also have their own management measures for oversized cargo transportation, requiring prior confirmation of destination country regulations.

Summarize
The goods transported by sea cover multiple fields such as energy, infrastructure, and industry, and the core criteria for judgment are the weight, size, and transportation difficulty of the goods. For such goods, it is necessary to evaluate the adaptability of the vessel, the feasibility of the route, and the loading and unloading plan through a professional logistics company in advance to ensure compliance with international shipping regulations and safety requirements.