For how long may a DOT cylinder be used before needing official recertification?

A Department of Transportation (DOT) cylinder must be recertified every 5 years from the date of its last hydrostatic test. This 5-year recertification period is a standard regulation designed to ensure the safety and reliability of the cylinders used for transporting gases under pressure. The rigorous testing process includes checks for structural integrity, which is crucial because any failure could result in hazardous situations.

This requirement is grounded in the necessity to monitor the aging and condition of the cylinders, as prolonged use may lead to material fatigue or degradation that could compromise their safety. Therefore, adhering to the 5-year recertification schedule is critical for maintaining compliance with safety regulations and ensuring safe handling of pressurized gases.