During her life the vessel is exposed to different factors such as moisture salt water and cargo which will contribute to the deterioration of the structure and coatings. Therefore it is extremely important to conduct tank inspections in order to check the integrity of the ship’s structure. There may be occasions when a tank inspection is not part of the planned procedure but is required following an incident. In this case common defects and cracks. Normally the dent will be first inspected from outside and then if necessary from inside.