Prepare screens by pressure washing, manual cleaning & scraping, then abrasive blasting to remove marine growth, debris and corrosion deposits. Assess repair work. Apply corrosion protection and Biofoul.
Corroglass 600 Series for repair and re-profiling, with a Polyglass PPA primer coat. Top coat of Biofoul applied for anti-fouling requirements.
Grit blast whole structure to ISO 8501-1, cleanliness standard SA 2 1/2 with minimum surface profile of 50μm. Apply Polyglass PPA to whole structure as a primer for the Corroglass 600 Series, applied to a min. dft of 1.5mm. Apply top coat of Biofoul.
Biofoul is an eco-friendly non-toxic coating. The mechanism by which Biofoul provides anti-foulin properties enables the product to be used in both static and self-polishing environments. The coating is mechanically strong (unlike many self-polishing anti-foulants), has a long life (when used in conjunction with a Corrocoat corrosion system) and is non-toxic. By applying a final coat of Biofoul, the Power Station has eliminated the costly requirement for regular cleaning & maintenance by divers. In addition to this replacing these screens would have cost considerably more than re-profiling and protecting by Corrocoat.
The screen after pressure washing – showing the extent of corrosion and pitting
Detail of the re-profiled cross-members
The completed screens awaiting despatch