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VOL XII, NO 46

Belzona® Prevents Galvanic And Crevice Corrosion On Rudder Horn

 
 

Industry:

Marine (MRNE)

 
 

Application:

Ships and Offshore Structures (SOS)

 
 

Customer Location:

Oil shipping company

 
 

Application Date:

1988

 
 

Application Situation:

Corrosion to internal of rudder horn of 280,000 Ton VLCC (Very Large Crude Carrier) required re-fixing of bearing.

 
 

Problem:

Corrosion of internal of Rudder Horn had allowed the press fitted bronze bearing to become free. Bearing was approximately 908mm (36-inch) diameter and 1050mm (41-inch) long.

 
 

Products:

Belzona® 1321 (Ceramic S-Metal)

Belzona® 1211 (E-Metal)

 

Substrate:

Carbon Steel and Bronze

 
 

Application Method:

The bearing was aligned and its position in the housing fixed using alignment bolts. The top and bottom of the housing were sealed using Belzona® 1211, then Belzona® 1321 was injected from below into the space behind.

 
 

Belzona Facts:

This method is used both in new-build and repair, and this example illustrates the ability to undertake this work while the vessel is afloat. Use of the Belzona materials isolates and permanently fixes the bearing into position preventing galvanic and crevice corrosion.

 
 

Photographs Description

  1. Belzona materials and team prepared for application.  
  2. Internal shot of bearing. Note arrows for injection ports.  
  3. Bearing after injection and prior to cleaning up of the Belzona® 1211 seal.
 
 
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For more information about Belzona visit: www.belzona.com