A single or double manhole assembly protected by a flash box and roll-over protection is an identification feature of which carrier?

A single or double manhole assembly protected by a flash box and roll-over protection is an identification feature of which carrier?

• A. MC 307/DOT 407
• B. MC 331
• C. MC 312/DOT 412
• D. MC 338

Answer: (A)

This design combination is a hallmark of non-pressurized liquid cargo tanks. A top single or double manhole protected by a flash box and rollover protection is used on MC 307/DOT 407 tanks. The flash box around the manhole helps contain or quench any flash fire that might occur at the opening, reducing ignition risk. Roll-over protection around the manhole adds a sturdy guard in case the vehicle overturns, helping prevent damage to the opening and exposure to vapors. Seeing this specific top-mount configuration—one or two manholes with a surrounding flash box and protective roll-over structure—signalizes the MC 307/DOT 407 family rather than other tank designs.

This design combination is a hallmark of non-pressurized liquid cargo tanks. A top single or double manhole protected by a flash box and rollover protection is used on MC 307/DOT 407 tanks. The flash box around the manhole helps contain or quench any flash fire that might occur at the opening, reducing ignition risk. Roll-over protection around the manhole adds a sturdy guard in case the vehicle overturns, helping prevent damage to the opening and exposure to vapors. Seeing this specific top-mount configuration—one or two manholes with a surrounding flash box and protective roll-over structure—signalizes the MC 307/DOT 407 family rather than other tank designs.