DOT pressure vessels (cylinders) require periodic inspections to evaluate the integrity and safety of each vessel. After years in use, it is important that authorized holders of a Re-qualification Identification Number (RIN) conduct a thorough examination of each vessel. Two non-destructive test methods are generally used for re-qualification: hydrostatic (volumetric expansion) and ultrasonic examination. Ultrasonic…

DOT pressure vessels (cylinders) require periodic inspections to evaluate the integrity and safety of each vessel. After years in use, it is important that authorized holders of a Re-qualification Identification Number (RIN) conduct a thorough examination of each vessel. Two non-destructive test methods are generally used for re-qualification: hydrostatic (volumetric expansion) and ultrasonic examination. Ultrasonic…