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Belzona® Rebuilds Stern Tube Bearing Supports In Minimum Time



Marine (MRNE)



Ships and Offshore Structures (SOS)


Customer Location:

U.S. Coast Guard Ice Breaker, Seattle


Application Date:

July 1995


Application Situation:

300 ton stern casting containing the bearings supporting the 36" diameter shafts



Erosion caused the bearings to become loose. This caused the shaft alignment to be lost, which imposed damaging loads on the shafts, bearings, reduction gearing and controllable pitch propeller systems.



Belzona® 1111 (Super Metal)

Belzona® 1321 (Ceramic S- Metal)



High strength steel alloy (HY80)


Application Method:

Application was carried out in accordance with Belzona Know-How Leaflets SOS-9 and MPT-6. Belzona® 1111 was applied at an average thickness of ½'' (12.5mm). When cured, the stern tube lands were bored to the desired step dimensions.


Belzona Facts:

Application was completed in six working days. There was no practical alternative as other methods would have required between 15-60 days and docking time was strictly limited. The estimated savings to the customer were between $100,000 and $450,000.


Photographs Description

  1. It takes a stalwart crew to mix 300kg of Belzona® 1111 in only a few hours   
  2. Great care was taken to ensure the substrate was correctly prepared prior to the application of Belzona products  
  3. Application of Belzona® 1111 to rebuild the bearing retaining lands
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