General Specifications for NRG COMPANY, INCORPORATED Chain and Flight Skimmer Equipment Part 2 - Products 2.7 Bearings   All bearings shall be split, peak cap, babbitted, self aligning, and water lubricated. Bearing housing material shall be cast iron, and shall bolted directly to the tank walls. Bearings shall be attached to the wall with two one inch diameter anchor bolts. All bearings shall be equipped with grease fittings for lubrication when the tanks are dewatered.     * all bearings are also available with UHMW-PE inserts in place of standard babbitt for use with potable water applications.