Study for the Life Time Extension was based on Desk Study as well as Field Inspections, both by the Licensor. Desk study of all relevant data received from Al bayroni with respect to inspection and maintenance history, average weather conditions in Al Jubail (to assess the risks for atmospheric corrosion) and other relevant data, such as failure investigation reports; was conducted in Licensor office. On-site inspections were planned & performed during an already planned TA in April/May2013 by Licensor team himself. These inspections consisted of visual examination, endoscopic examination and ultra-sonic thickness measurements (both by point-thickness readings and surface-scanning).