KHIA headerKnow-How in Action

VOL XXVIII, NO 57

Belzona® Rebuilds Eroded Stern Tube Sealing Face

 
 

Industry:

Marine (MRNE)

 
 

Application:

Ships and Offshore Structures (SOS)

 
 

Customer Location:

Maersk Lines Container Ship, Lisnave ShipYard, Setubal, Portugal

 
 

Application Date:

April 2014

 
 

Application Situation:

Stern Tube of container ship.

 
 

Problem:

Galvanic corrosion damage on the boss sealing surface of stern tube system

 
 

Products:

Belzona 1311 (Ceramic R-Metal)

 

Substrate:

Steel

 
 

Application Method:

Application was carried out in accordance with Belzona Know-How System Leaflet SOS-1.

 
 

Belzona Facts:

The traditional solution to this problem would involve precision machining of the boss surface. The initial preparation, setting up of equipment and the subsequent inspection all put together the estimated repair time for the alternative arrangement was about 8 days. The Belzona application and assembly was completed in 36 hours and inspection subsequent to the application and curing indicated a good even coat of Belzona. The system was assembled and checked for tightness satisfactorily. In normal running conditions, this repair will perform as good or better than the normal arrangement as the Belzona provides an erosion-corrosion resistant surface and being an electrical insulator will eliminate potential for galvanic corrosion in this area.  The repair was completed with class ABS supervision.

 
 

Photographs Description

  1. Stern Tube with Galvanic Corrosion
  2. Stern Tube after preparation with MBX Bristle Blaster
  3. Stern Tube after applying Belzona 1311
  4. Completed repair after polishing the Belzona 1311
 
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