Offshore Oil 942 Underwater Pile Leg Marine Biological Removal Anti-corrosion

The offshore oil platform 942 is a wellhead platform and an important component of the oil production system. As it remains in the sea for a long time, the underwater pipe legs and side areas are prone to extensive growth of marine organism. This growth significantly impacts the mechanical performance of the platform’s coating system and materials, thereby affecting its safety.

Traditional methods involve manual scraping and sandblasting, but both can only partially remove the shells and some roots of marine organisms. But significant amounts of root tissue remain firmly attached to the metal surface, with a high concentration of soluble salt substances. This poses a severe threat to the coating system. However, high-pressure water jetting has a prying effect and can perfectly eliminate all attached marine organisms.

For this anti-corrosion project, our company utilized high-pressure water technology with different cleaning attachments for various areas. We employed handheld guns for cleaning and desalination of the pile leg structure area, while an automated surface attaching robot system was used for the removal and desalination of marine organisms in the outer side area of stringer. The entire operation was conducted through wireless remote control, reducing the risks.

This anti-corrosion project reduced maintenance time by two-thirds compared to previous repairs, also reducing the docking time. According to the inspection conducted two years after the operation, the coating system remained intact without bubbling, cracking, or detachment.