DOT/CTC containers shall not be refilled unless they have been hydro tested within 5 years.

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Multiple Choice

DOT/CTC containers shall not be refilled unless they have been hydro tested within 5 years.

The essential idea is that a DOT/CTC container can only be refilled if its most recent hydrostatic test is still valid—within the last five years. Hydrostatic testing checks the container’s ability to withstand pressure by filling it with water and applying stress well above its normal operating pressure, which helps detect thinning walls, corrosion, or other flaws. Because safety depends on the container maintaining its strength, refilling is prohibited if the hydro test is older than five years; the container must be retested and recertified before reuse. Some options might suggest no test is needed or that refilling could happen under certain conditions, but the regulation sets a clear five-year window, making the statement true.

The essential idea is that a DOT/CTC container can only be refilled if its most recent hydrostatic test is still valid—within the last five years. Hydrostatic testing checks the container’s ability to withstand pressure by filling it with water and applying stress well above its normal operating pressure, which helps detect thinning walls, corrosion, or other flaws. Because safety depends on the container maintaining its strength, refilling is prohibited if the hydro test is older than five years; the container must be retested and recertified before reuse. Some options might suggest no test is needed or that refilling could happen under certain conditions, but the regulation sets a clear five-year window, making the statement true.

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