High-Load Roller Bearing of Atlas Copco RD18U in Canada

Canada's potash mines in Saskatchewan—Nutrien's Vanscoy and Cory operations, Mosaic's Esterhazy—present a different mechanical environment for the RD18U's roller bearing than the hard-rock applications the drifter was primarily designed around. Potash is soft (UCS 20–40 MPa) and highly water-soluble. Drilling speed is fast, rotation demand is low, but the moisture environment is aggressive: brine-saturated mine water at sodium chloride concentrations above 300 g/L permeates into equipment crevices, attacks bearing cage materials, and creates a corrosive environment that accelerates bearing raceway pitting at a fraction of the rate hard-rock applications see from mechanical wear.

The roller bearing in the RD18U rotation motor assembly carries combined radial and axial loads from the rotation gear mesh while the motor shaft transmits torque to the driver. In Canadian potash, the primary bearing failure mode isn't fatigue spalling from load—it's corrosion-fatigue: the bearing raceway develops shallow pits from electrochemical attack, and those pits then become fatigue crack initiation sites under the rolling contact stress. The resulting failure produces fine, non-magnetic corrosion debris that doesn't show on the magnetic plug inspection the maintenance team uses for mechanical wear detection.

Bearing Material and Corrosion Resistance for Potash Applications

Nutrien's maintenance team at Vanscoy has switched to DLC (diamond-like carbon) coated roller bearings on their RD18U rotation motors after a systematic comparison of bearing failure rates across bearing material types over 18 months. The corrosion-fatigue failure rate dropped by 65% and average bearing life increased from 1,400 to 2,100 percussion hours. HOVOO supplies high-load roller bearings for the RD18U in multiple surface treatment options suited to Canadian potash and other highly corrosive underground environments. Full specifications at hovooseal.com.