EPA Section 608 Universal Certification ExamCoreMedium
A technician is preparing to ship a recovered refrigerant cylinder containing R-407C. Which of the following DOT requirements must be met before shipment?
- AThe cylinder must be filled to no more than 80% of its capacity by weight.
- BA Class 2.2 non-flammable gas label must be affixed to the cylinder.
- CThe cylinder must be equipped with a pressure relief valve and a liquid level indicator.
- DThe cylinder must be painted a specific color based on the refrigerant type.
Show answer & explanationAnswer & explanation
Correct answer: B. A Class 2.2 non-flammable gas label must be affixed to the cylinder.
DOT regulations require that cylinders containing recovered refrigerants classified as non-flammable gases (like R-407C) have a Class 2.2 non-flammable gas label. While fill limits and pressure relief valves are also requirements, the specific label is a direct answer to a DOT shipping requirement.
Why the other options are wrong
- A. The 80% fill limit is a safety requirement for cylinders generally, but it's not the only or primary *shipping* requirement in terms of documentation/labeling.
- C. Pressure relief valves are a design requirement for refrigerant cylinders, and liquid level indicators are helpful, but these are not specific *shipping* requirements in the same category as labeling for transport.
- D. While cylinders often have color codes, DOT regulations focus on proper labeling, marking, and structural integrity for shipping, not specific paint color for refrigerant type.
DOT Refrigerant Shipping Requirements
The Department of Transportation (DOT) regulates the safe transport of hazardous materials, including recovered refrigerants, specifying cylinder integrity, labeling, marking, and fill limits.
- Cylinders must be approved by DOT (e.g., DOT 4BA, DOT 4BW).
- Must have appropriate hazard classification labels (e.g., Class 2.2 for non-flammable gas).
- Must be clearly marked with refrigerant type and weight.
- Fill limit: no more than 80% by weight (for most refrigerants).
Memory trick: DOT shipping: Label it right, weigh it light, keep it tight.