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Information regarding type, size, shape and location of the defects in objects can be obtained easily by the new generation of ultrasonic instruments which use Phased Array technology. This investigation studies the results of ultrasonic test with Phased Array technology done on a storage vessel and matches them with environmental conditions like corrosion to detect the type of the defects with 100% certainty. Inspections show that the detected cracks in the shell metal are originally formed by hydrogen induced cracking and calculations show that these cracks will not grow up if the hydrogen diffusion through the metal is stopped. Therefore, it is predicted that the operation of the pressure vessel in normal condition and under regular supervision can be continued if a suitable coating is applied to the interior of the vessel to prevent hydrogen diffusion.