Contamination of bearing oil occurs when condensation forms as the pump cools down and heats up, such as being subjected to a hot day and cool night. Most pumps installed outside will be subject to condensation. 0.002% of water in the bearing housing oil can be found due to condensation and this significantly reduces the bearing's lifespan. With the BOA attached it is easy to see when there is water or contamination to the bearing oil. The BOA is installed in the sump/drain plug tapping and, as water is heavier than oil, the water will sink to the bottom of the BOA where it can be viewed and drained away or samples taken for testing.
