KHIA headerKnow-How in Action

VOL XXVIII, NO 31

Belzona® Repairs Trunnion Ball Mill In Situ

 
 

Industry:

Mining and Quarrying (MINQ)

 
 

Application:

Mechanical Power Transmission (MPT)

 
 

Customer Location:

Mine, MA, Brazil

 
 

Application Date:

February, 2011

 
 

Application Situation:

Sliding bearing area of the ball mill’s trunnion

 
 

Problem:

Wear on the trunnion’s sealing edge due to ore’s abrasion between the rubber ring and the edge. In addition, localized wear on the trunnion’s seating area of the socket was present. Trunnion’s diameter: 1.200 mm. Operation is at room temperature.

 
 

Products:

Belzona 1131 (Bearing Metal)
Belzona 1311 (Ceramic R-Metal)
Belzona 1321 (Ceramic S-Metal)

 

Substrate:

Carbon Steel

 
 

Application Method:

After removal of oil and residual grease, the surfaces were prepared with electrical sander. The sealing edge was recovered with the application of Belzona 1311 and coated with Belzona 1321 to achieve a polished finishing resistant to abrasion. The seating area of the socket, was repaired with the application of Belzona 1131 (Bearing Metal) to rebuild thickness loss where there is metal to metal contact. The application and finishing were performed manually.

 
 

Belzona Facts:

Belzona technology offered the following advantages: quick return to service, elimination of hot work with electrical welding and low cost.

 
 

Photographs Description

Wear on the trunnion’s sealing edge Application of Belzona 1131 on the trunnion Application of Belzona 1311 on the trunnion’s edge Trunnion’s edge coated 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