KHIA headerKnow-How in Action

VOL XXXII, NO 56

Belzona® Repairs Rudder Housing

 
 

Industry:

Marine (MRNE)

 
 

Application:

Ships and Offshore Structures (SOS)

 
 

Customer Location:

Drydock, Greenock, Scotland

 
 

Application Date:

March 2017

 
 

Application Situation:

Passenger ferry in dry dock. A becker rudder pintle bush had become loose due to galvanic corrosion. The bush had slipped down the rudder pin & had begun to wear on the housing itself.

 
 

Problem:

The normal repair method would involve shrink fitting the bush back into place. The erosion/corrosion on the housing & bush was too severe for this method to be used.

 
 

Products:

Belzona 1111 (Supermetal)

 

Substrate:

Bronze/steel

 
 

Application Method:

The application was carried out in accordance with Belzona System Leaflet SOS-9. The bush was machined to give a 5mm clearance. The housing was grit blasted and Belzona 1111 applied to the two parts, then the bush was pressed into position. Care had to be taken to ensure the correct alignment of the piece.

 
 

Belzona Facts:

The Belzona solution avoided the hotwork involved with the original solution, as well as ensuring a speedy return to service. Belzona 1111 ensures the original issue of galvanic corrosion will not reoccur, extending the service life. 

 
 

Photographs Description

1- Area to be repaired

2- Bush showing large amounts of wear

3- Housing before grit blasting

4- Bush bonded in & aligned

 
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