Transcription of Bearing Protection Devices and Equipment …
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Bearing Protection Devices and Equipment …
20 OCTOBER & SYSTEMSR otating labyrinth seals (commonlycalled Bearing protectors and bearingisolators ) can be found in many OEMand retrofit applications. Bearing isola-tors are an improvement over the olderstationary labyrinths. They come in differ-ent versions, however, and some may notperform as expected. Pressure-relief poppet valves aremarketed for the Bearing housings ofcentrifugal pumps and other can be shown that they are rarely, if ever,of any merit. Finally, a new generation of on-linemoisture-monitoring Devices and desic-cant-containing absorber cans are offeredby competent manufacturers. They areintended for mounting at the top of thevapor space of pump Bearing housingsbut are not always cost-justified. Rotating-Labyrinth Bearing -HousingSealsIt has long been recognized that as manyas 91% of all the rolling element bearingsinstalled in the world s machinery fall shortof reaching the manufacturer s calculatedL-10 life.
Bearing isolators fitted with dynamic O-rings (Fig. 4) try to close the gap through which airborne contaminants can enter the bearing housing. The expectation is for the
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