The U.S. Department of Transportation (DOT) has specific requirements for fuel transfer tanks to ensure safety and compliance with transportation regulations. These requirements are outlined in Title 49 of the Code of Federal Regulations (CFR), particularly in Part 178, Subpart N, which covers specifications for packaging and containers.

Here are some key DOT requirements for fuel transfer tanks:

1. Tank Design and Construction: Fuel transfer tanks must be designed and constructed to meet the specifications outlined in 49 CFR 178.345-10. This includes requirements for materials, weld quality, and structural integrity.
2. Pressure Testing: Tanks must undergo pressure testing to ensure they can safely contain the fuel they are designed for without leakage or structural failure.
3. Marking and Labeling: Tanks should be marked and labeled with specific information, including the tank's capacity, manufacturer's information, and DOT certification mark. The labeling should be durable and legible.
4. Venting: Tanks must have appropriate venting systems to prevent pressure buildup and to ensure the safe release of vapors.
5. Fill and Discharge Ports: Tanks must have suitable fill and discharge ports designed for the intended purpose. These ports should be properly sealed when not in use.
6. Safety Features: Tanks should have safety features such as pressure relief devices to prevent over-pressurization and other mechanisms to prevent accidents.
7. Compatibility: The materials used in the tank and its components must be compatible with the type of fuel they will contain.
8. Mounting and Securing: Tanks should be securely mounted and secured to the vehicle to prevent movement during transportation. Proper mounting hardware and techniques are crucial.
9. Inspection and Maintenance: Regular inspection and maintenance are essential to ensure that the tank remains in good condition and complies with DOT requirements.
10. Testing and Certification: Manufacturers of fuel transfer tanks must have their products tested and certified to ensure compliance with DOT regulations. Tanks must be marked with a DOT certification mark to indicate compliance.
11. Hazardous Materials Regulations: Depending on the type of fuel being transported, additional regulations under Hazardous Materials Regulations (HMR) may apply. These regulations address the labeling, placarding, and handling of hazardous materials, including fuels.
12. Vehicle Compatibility: Fuel transfer tanks must be compatible with the vehicle on which they are installed. The installation should meet applicable DOT and state regulations.

It's important to note that these requirements can change over time, so it's essential to consult the latest version of the Code of Federal Regulations and any specific state or local regulations that may apply to fuel transfer tanks. Additionally, manufacturers often provide guidance and information on complying with DOT requirements for their sp

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