What is the pressure range for a DOT 406 cargo tank?

What is the pressure range for a DOT 406 cargo tank?

• A. 1-2 psi
• B. 3-5 psi
• C. 10-20 psi
• D. 50-60 psi

Answer: (B)

DOT 406 cargo tanks are non-pressurized, low‑pressure tanks used for flammable liquids like gasoline. Because they aren’t designed to hold high internal pressure, their maximum allowable working pressure is only a few psi—typically around 3 to 5 psi. This low rating keeps venting manageable and matches the tank’s simple construction. The higher pressures listed would belong to completely different, pressurized tank designs, not DOT 406. So the correct range is about 3 to 5 psi.

DOT 406 cargo tanks are non-pressurized, low‑pressure tanks used for flammable liquids like gasoline. Because they aren’t designed to hold high internal pressure, their maximum allowable working pressure is only a few psi—typically around 3 to 5 psi. This low rating keeps venting manageable and matches the tank’s simple construction. The higher pressures listed would belong to completely different, pressurized tank designs, not DOT 406. So the correct range is about 3 to 5 psi.