Water-Resistant Greases for Submerged Sliding-Contact Surfaces.

摘要

The development of methods and apparatus for evaluating greases as lubricants for sliding-contact bearings in underwater environments are described. Results of examining 43selected greases indicate that those containing base oils of higher viscosity are more resistant to water wash off,and develop higher torques between sliding-contact surfaces at low temperatures,than greases containing oils of lower viscosity. On the basis of the results,it is recommended that greases be evaluated for their capability of generating torques not to exceed 6250 g-cm (0.0625 N.m) at temperatures as low as -30 F (-34.4 C) and not to exceed a weight-loss maximum of 30% and an average of 15% weight loss when subjected to the procedures described. (Author)