KHIA headerKnow-How in Action

VOL XXV, NO 62, ELITE

Propeller Cavitation Damage Repaired With Belzona

 
 

Industry:

Marine (MRNE)

 
 

Application:

Ships and Offshore Structures (SOS)

 
 

Customer Location:

Ship Dockyard, Bulgaria

 
 

Application Date:

June, 2008

 
 

Application Situation:

Bronze propeller of bulk carrier.

 
 

Problem:

The cavitation demage close to the edges of the bronze propeller caused lower hydrodynamic efficiency and propulsion capabilities of the vessel.

 
 

Products:

Belzona® 1311 (Ceramic R-Metal)

Belzona® 1321 (Ceramic S-Metal)

 

Substrate:

Bronze

 
 

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.

 
 

Photographs Description

  1. The general view of cavitation damages after grit blasting
  2. After rebuild with Belzona® 1311 two coats of Belzona® 1321 were applied
  3. Inspection one year after the repair found some small mostly mechanical damage that were prepared by Bristle blasting
  4. The damaged areas were corrected with Belzona® 1321
 
Case study pic one

 

 
 Case study pic two

 

 
 Case study pic three

 

 
 Case study pic four

 

 
 
For more information about Belzona visit: www.belzona.com