What is the pressure range for a DOT 407 cargo tank?

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Prepare for the CRE Awareness and Operations Test. Study with multiple choice questions, each with insightful explanations and valuable hints. Ensure you're ready to succeed on exam day!

Multiple Choice

What is the pressure range for a DOT 407 cargo tank?

Explanation:
DOT 407 cargo tanks are designed to carry liquids that can generate vapor pressure as they heat, so the tank must withstand a range of internal pressures rather than a single fixed number. The rating increases with temperature: about 18 psi when the cargo is at 100°F and up to about 40 psi at 170°F. This reflects the venting and safety design that accommodates vapor pressure buildup while preventing overpressure. The other options don’t fit because they either describe pressures that are too low for this type of tank or exceed what DOT 407 tanks are built to safely handle.

DOT 407 cargo tanks are designed to carry liquids that can generate vapor pressure as they heat, so the tank must withstand a range of internal pressures rather than a single fixed number. The rating increases with temperature: about 18 psi when the cargo is at 100°F and up to about 40 psi at 170°F. This reflects the venting and safety design that accommodates vapor pressure buildup while preventing overpressure. The other options don’t fit because they either describe pressures that are too low for this type of tank or exceed what DOT 407 tanks are built to safely handle.

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