KHIA headerKnow-How in Action

VOL XXXI, NO 33

Rudder Pintle Rebuilt With Belzona® 1111

 
 

Industry:

Marine (MRNE)

 
 

Application:

Mechanical Power Transmission (MPT)

 
 

Customer Location:

Portland, OR, USA

 
 

Application Date:

November 2015

 
 

Application Situation:

Rudder pintle shaft on a 700' US Navy ship.

 
 

Problem:

Shaft was corroded and pitted from salt water.

 
 

Products:

Belzona 1111 (Super Metal)

 

Substrate:

Steel

 
 

Application Method:

All of the damaged areas were removed with a lathe. The surface was then prepared with the lathe to leave a super rough thread pattern to ensure a full mechanical bond. Again, using the lathe, Belzona 1111 was applied with a slow rotation. After a sufficient amount of material was applied, Belzona 1111 was allowed to fully cure and then machined to the required specifications. There was one low spot and a couple of air pockets visible, so those areas were once again abraded and a further layer of Belzona 1111 was applied and allowed to cure before the final machine cut was made. The final finish was made using emery cloth, leaving a perfect smooth finish.

 
 

Belzona Facts:

Welding would risk warping the shaft and would have taken probably close to ten times the man-hours to complete. The actual time spent on this process was no more than 6 hours, not including cure time.

 
 

Photographs Description

  1. Shaft already machined down, some damage still visible.
  2. Rough cut thread pattern.
  3. Applying Belzona 1111.
  4. Completed application, finishing with emery cloth.
 
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