Schaeffler UK has custom-designed a set of maintenance-free spherical plain bearings to support a newly constructed process module extension column, which is fixed to the main offshore platform located in the North Sea.
The function of the bearings is to provide a flexible support between the mono column and main rig allowing for movement of the column caused by waves and tidal current relative to the main rig. The bearings, which have a bore diameter of 1m, are designed to transfer these loads from the column to the main rig.
Schaeffler’s standard ELGES spherical plain bearing is fitted with only one seal on each side of the bearing, so a special sealing arrangement was discussed with the customer. The custom bearings are fitted with additional seals and designed with an extra sliding layer in the bore. This ensures low friction when the extension column moves relative to the main rig due to the ocean waves. The bearings were manufactured according to strict customer specifications, with all bearing materials, components, manufacturing and quality processes all fully traceable.
The bearings were installed on the offshore platform extension column in May 2013.