Overview Documents References Videos Warranty Design Faq Get-quote


Commercial newbuild ship owners of ships with stern tube (single/twin screw) with shaft diameter of 300mm (12”) or greater. The program excludes certain twin screw vessels such as cruise ships/ naval/coast guard vessels. COMPAC conversions may also be considered on a case by case basis.

The ship owner must clearly specify the complete COMPAC system (see below) to the shipyard in order to qualify for the 15-year wear life guarantee. There will be a full technical signoff by Thordon Bearings prior to issuance of the 15-year wear life guarantee. A copy of the specification is available from Thordon.

COMPAC Stern Tube Bearing System:
The COMPAC propeller shaft bearing system specification includes:
a) COMPAC propeller shaft bearings for shafts of 300mm (12”) or greater
b) Thordon Water Quality Package
c) Shaft liners
d) Thor-Coat shaft coating
e) Forward seal
Items a, b, c, and d must be supplied by Thordon. Item e must be approved by Thordon before issuance of the guarantee. If bearing carriers are a required part of the design, they would also be supplied by Thordon Bearings.

What is the Guarantee?
The Thordon seawater lubricated COMPAC bearing system is guaranteed to meet Classification Society propeller shaft bearing wear specifications for 15 years or Thordon Bearings will supply new bearings free of charge. The guarantee is limited to the supply of replacement bearings delivered to the ship. It does not include replacement of any other Thordon supplied components nor any drydocking or installation costs.  Standard operating parameters as specified by Thordon Bearings (for example – system maintenance, minimum water flows, etc.) must have been provided and maintained by the ship owner.

The guarantee is limited to the owner of the ship. If the ship were sold, the balance of the time outstanding on the guarantee can be transferred to the new ship owner for a fee (25% of price of fully machined set of bearings). The guarantee would be issued by Thordon Bearings directly to the shipowner or his designate and would not be offered through the shipyard.

Thordon is offering this guarantee because of our confidence in Thordon COMPAC propeller shaft bearings and the proven experience and wear life of COMPAC bearings operating in commercial vessels in the last 20 years.