By J.C. Fitch and Simeon Jaggernauth
P/PM Technology magazine
Moisture is generally referred to as a chemical contaminant when suspended in lubricating oils. Its destructive effects in bearings can reach or exceed that of particle contamination, depending on conditions. Like particles, control must be exercised to minimize water accumulation and damage to bearing surfaces. Once water enters a machine with bearings (i.e., an engine, turbine, or gear box) it may move through several chemical and physical states. Water will often enter an oil in one of the five following ways.