TCFP Plans Examiner Practice Test

Above-ground atmospheric tanks for flammable or combustible liquids are designed to withstand pressures of what range?

1. 0 to 1 psi

2. 0 to 0.5 psi

3. 1 to 5 psi

4. 1 to 10 psi

The correct answer is: 0 to 0.5 psi

The selection of a pressure range of 0 to 0.5 psi for above-ground atmospheric tanks used for flammable or combustible liquids aligns with industry standards for such containers. Atmospheric tanks are designed primarily for storing liquids at pressures close to atmospheric pressure, which generally means they are not intended to withstand significant internal pressure. Tanks designed for these applications typically operate under atmospheric conditions, which involve little to no pressure variation. Hence, the minimal range of 0 to 0.5 psi represents the acceptable operational tolerance for any minor fluctuations that could occur due to temperature changes or filling operations. This design characteristic ensures safety, preventing the risk of tank rupture or leaks that could arise from sustained higher pressures. Higher pressure ranges, like those listed in the other options, are generally specified for pressure vessels or tanks designed to operate under controlled pressure conditions, which do not apply to standard above-ground atmospheric tanks for flammable or combustible liquids. This focus on the lower pressure is a critical aspect of safety regulatory standards in hazardous material storage.