After gas-free certification, ballast tank ventilation, and cleaning operations had been successfully performed, our team identified the bottom holes in the No.1 and No.4 ballast tanks, and Non-Destructive Testing (NDT) measurements of the shell plates were conducted from inside the tanks.
The NDT measurements revealed the following results:
- Ballast Tank No.1: Thickness values of 14.4 mm, 17.3 mm, and 17.5 mm.
- Ballast Tank No.4: Thickness values of 14.3 mm, 14.4 mm, and 14.5 mm.
After the measurements, a cofferdam, prepared to the specified dimensions, was installed underwater. Once water tightness was verified, two new shell plates, each measuring 50 cm x 50 cm x 1.6 cm, were welded in place. The perforated shell plates from Ballast Tanks No.1 and No.4 were cut out, completing the insert repair process.
Following the repairs, the underwater cofferdam was removed. One line of underwater welding was performed, and steel epoxy putty was applied.
