The review and allocation of dangerous goods shipping space by shipping companies are mainly based on the International Maritime Dangerous Goods Code (IMDG Code) and the ship's own safety regulations. The specific procedures and allocation principles are as follows:

一、Dangerous Goods Cargo Space Review Process

Detailed Review 

MSDS Content Review: Conduct an in-depth review of various technical information in the MSDS, including but not limited to data such as the physical and chemical properties of dangerous goods, flash point, ignition point, explosion limits, toxicity, and radioactivity. For flammable liquids, focus on whether the flash point meets the safety transportation requirements; for toxic substances, pay attention to their toxicity levels and protective measures, etc., to determine the risk level of the goods during transportation. Packaging Compliance Review: Based on materials such as dangerous goods packaging certificates, review whether the packaging of dangerous goods meets the packaging category requirements specified in the IMDG Code. Check whether the material, specification, strength of the packaging, as well as the marks and labels on the packaging are correct, clear and in line with standards, to ensure that the packaging can effectively protect the goods during transportation and prevent leakage, damage, etc. Special Requirements Check: For certain special dangerous goods, such as radioactive substances and infectious substances, review whether they meet additional special transportation requirements, such as whether they have special transportation permits, whether they need to be equipped with specific monitoring equipment or escorts, etc. Multi-Party Approval Independent reviews by the shipping company's headquarters, transit port, and destination port to confirm the suitability and compliance of the goods for transportation. For example, for battery-related dangerous goods, the UN38.3 certificate needs to be reviewed, and their stowage position on the ship (such as avoiding direct sunlight) should be evaluated. The review cycle is usually 1-3 working days, and some high-risk goods (such as Class 4.2 spontaneous combustion substances) may take longer. Data Accuracy Requirements The booking data must be strictly consistent with the customs declaration data. Modifications may lead to re-review or document amendment fees. For example, shipping companies such as HMM and MSC prohibit modifications to dangerous goods booking data.

二、Principles for the Allocation of Dangerous Goods Cargo Spaces

Isolation Rules (IMDG Code)

According to the classification of the dangerous nature of goods (such as Class 3 flammable liquids, Class 4.3 substances that release flammable gases when in contact with water), allocate the cargo space in accordance with the requirements of the segregation table:

Isolation levels: 1 (keep away), 2 (isolate), 3 (full cabin isolation), 4 (longitudinal full cabin isolation). For details, please refer to the "Dangerous Goods List" and isolation codes in the International Maritime Dangerous Goods Code (for example, SG26 requires horizontal isolation of two container positions). Special requirements: Acids and alkalis (Class 8), oxidizing agents (Class 5.1) and flammable solids (Class 4.1) must be strictly isolated. Some goods also need to avoid contact with heat sources and water sources.。

Ship Structure and Cargo Suitability

Container Stowage Specifications

Container slot numbers are marked by Bay, Row, and Tier. Cargo is stowed on even-numbered tiers inside the cabin, and on the deck, they are marked with even-numbered tiers such as 82 and 84. When stowing on the deck, it is necessary to ensure the lateral isolation distance from other dangerous goods (for example, SG26 requires a lateral distance of at least two container slots from Class 3 goods).。

三、Operation Notes