CDL Hazardous Materials Endorsement (HME)Bulk Tanks and Other ContainersHard
A consignor is preparing a portable tank for a hazardous material shipment. Which type of portable tank is typically used for transporting non-refrigerated liquefied compressed gases, with test pressures generally ranging from 100 psi to 500 psi?
- AUN T50
- BUN T14
- CUN T11
- DUN T75
Show answer & explanationAnswer & explanation
Correct answer: A. UN T50
UN T50 portable tanks are specifically designed for the transport of non-refrigerated liquefied compressed gases and typically have test pressures ranging from 100 psi to 500 psi, making them suitable for cylinders and pressure vessels.
Why the other options are wrong
- B. UN T14 tanks are for liquid hazardous materials, often corrosive, with moderate test pressures.
- C. UN T11 tanks are for liquid hazardous materials, not typically liquefied gases, with lower test pressures.
- D. UN T75 tanks are for refrigerated liquefied gases, which have different design and pressure requirements.
UN Portable Tank Specifications
UN portable tank specifications (e.g., T11, T50, T75) define the design, construction, and testing requirements for tanks used in international and domestic transport of various hazardous materials, including liquids and gases.
- UN T11: General purpose liquids, moderate hazard.
- UN T50: Non-refrigerated liquefied compressed gases.
- UN T75: Refrigerated liquefied gases.
- Test pressure is a key differentiator for tank types.
Memory trick: The 'T' in UN Tanks means 'Type' for specific hazmat: T11 for liquids, T50 for non-refrigerated gases, T75 for cold gases.