PROPELLER CAVITATION DAMAGE REPAIRED WITH BELZONA
Industry: Marine (MRNE)
Application: SOS-Ships and Offshore Structures (SOS)
Substrate: Bronze
Customer Location: Ship Dockyard, Bulgaria
Application Date: June, 2008
Products:
Belzona® 1311 (Ceramic R-Metal)
Belzona® 1321 (Ceramic S-Metal)
Problem: The cavitation demage close to the edges of the bronze propeller caused lower hydrodynamic efficiency and propulsion capabilities of the vessel.
Photograph Descriptions
- The general view of cavitation damages after grit blasting
- After rebuild with Belzona® 1311 two coats of Belzona® 1321 were applied
- Inspection one year after the repair found some small mostly mechanical damage that were prepared by Bristle blasting
- The damaged areas were corrected with Belzona® 1321
Application Situation
Bronze propeller of bulk carrier.
Application Method
Application was carried out in accordance with Belzona Know-How System Leaflets SOS-1 and SOS-2.
Belzona Facts
The rebuild of cavitation damages by conventional welding and remachining were considered as too time consuming and required special skills to restore significant metal losses. The Belzona repair, in spite of being sacrificial, was chosen as more cost effective and time saving. After 1 year minor damage, mainly mechanical was found and locally repaired with further Belzona using an MBX Bristle Blaster for surface preparation.
