Transporting Petroleum Fractions: A Hazard Classification and Logistics Guide for International Shipping
—— A Focus on Shipping Petroleum Fractions from China
As a cornerstone of global industry, petroleum products are among the most commonly shipped bulk chemicals. Their safe and compliant transportation via sea (governed by the IMDG Code) or air (governed by the IATA DGR) hinges on a precise understanding of their hazard classifications, which are intrinsically linked to their distillation fractions. This guide outlines the critical logistics considerations for transporting these materials.
Part 1: From Refinery to Logistics: Understanding Petroleum Fractions
Crude oil is separated into distinct "fractions" through distillation based on boiling points. Each fraction possesses unique physical and chemical properties that dictate its hazard profile for transport.
| Fraction | Typical Boiling Range | Common Transport Form & UN Number | Primary Hazard Class (Transport) |
|---|---|---|---|
| Liquefied Petroleum Gas (LPG) | < 20°C | Pressurized liquid in tanks/cylinders. UN 1075 |
Class 2.1 – Flammable Gas |
| Naphtha / Gasoline Fraction | 20–200°C | Liquid, in bulk or drums. UN 1203 (Gasoline), UN 1268 (Petroleum distillates, n.o.s.) |
Class 3 – Flammable Liquid |
| Kerosene Fraction | 150–300°C | Liquid, in bulk or drums. UN 1223 (Kerosene) |
Class 3 – Flammable Liquid |
| Diesel Fraction | 180–410°C | Liquid, primarily shipped in bulk. UN 1202 (Diesel fuel) |
Class 3 – Flammable Liquid |
| Lubricating Oil Fraction | 350–520°C | Liquid, in bulk or drums. UN number depends on flash point. |
Typically Class 3 or Class 9 (e.g., Environmentally hazardous) |
| Residual Fuel Oil | 520°C | Liquid (heated) or solid, in bulk. UN number depends on properties. |
Possibly Class 9 (e.g., Environmentally hazardous substance) |
Part 2: Hazard Classification: The Foundation of Compliant Shipping
For flammable liquids (Class 3), the Packing Group (PG)—which dictates the degree of danger and packaging standards—is determined by specific laboratory test data, not the product name alone.
Key Determining Parameters:
- Flash Point (closed cup): The lowest temperature at which a liquid gives off vapor that can be ignited. This is the primary criterion for Class 3.
- Initial Boiling Point: Used in conjunction with the flash point to determine the Packing Group.
Packing Group (PG) Determination Logic:
According to UN Model Regulations, IMDG Code, and IATA DGR:
- PG I (High Danger): Initial boiling point ≤ 35°C.
- PG II (Medium Danger): Flash point < 23°C, and initial boiling point 35°C.
- PG III (Low Danger): Flash point ≥ 23°C and ≤ 60°C, and initial boiling point 35°C.
- Not Restricted: Flash point 60°C.
Critical Compliance Note: Products under generic names like "naphtha" can vary between batches. Laboratory testing of each shipment is mandatory to assign the correct PG. Misclassification leads to non-compliant packaging, documentation errors, carrier rejection, and safety risks.
Mandatory Classification for Diesel:
Since January 1, 2023, all types of diesel fuel have been listed in China's Catalog of Hazardous Chemicals. Consequently, all diesel exports from China must be declared and transported as Class 3 Flammable Liquids (typically PG III, UN 1202), regardless of a higher flash point.
Part 3: Key Steps for Compliant Shipment
| Step | Key Requirements |
|---|---|
| Obtain Authoritative Classification | Prior to booking, a qualified laboratory must test the shipment to perform a Hazard Classification Identification and issue a Transportation Condition Appraisal Report or a compliant Safety Data Sheet (SDS) detailing the proper shipping name, UN number, class, and PG. |
| Accurate Declaration & Documentation | Declare the goods as dangerous to your freight forwarder/carrier, providing the SDS and a Dangerous Goods Consignment Note. For sea freight, prepare a Dangerous Goods Declaration and Container Packing Certificate; for air freight, a shipper-signed Dangerous Goods Declaration is required. |
| Compliant Packaging & Marking | Use certified dangerous goods packaging matching the assigned PG. All packages must bear correct, durable hazard labels and marks, including the proper UN number, shipping name, and hazard pictograms. |
| Engage Qualified Partners | Work with freight forwarders and carriers certified and experienced in handling dangerous goods (DG). They ensure the end-to-end process—booking, documentation, packing, and declaration—complies with the complex requirements of the IMDG Code or IATA DGR. |
Conclusion
The international transport of petroleum fractions is a highly specialized field governed by strict regulations. The foundation of safety and compliance is an accurate hazard classification based on laboratory test data. Assuming a classification based solely on a product name carries significant risk. Shippers, logistics providers, and carriers must adhere to the principle of "test first, declare accurately, and operate in compliance" to ensure the secure and efficient flow of these essential materials within the global supply chain.