![]() ![]() What’s more, all contact seals consume power - around 150 watts per contact surface - and cause heating of the lubricant and even the bearings.įace seals have another challenging limitation. As the seal’s condition deteriorates it can groove the shaft, carbonize at points of contact with the shaft, and finally lose its ability to effectively seal the bearing enclosure. For example, in a typical setup a rubber lip seal with a maximum useful life of 3,000 hours - 4.1 months - might protect rolling element bearings with a design life rating exceeding 150,000 hours - 17 years. ![]() However, when worn seals aren’t promptly replaced, they compromise systems. TIR, shaft-to-bore misalignments to 0.007 in., and shaft surface speeds to 12,000 ft/min.Ī: Contact seals are also used to protect bearings. One representative isolator design can operate with a continuous temperature limit of -40° to 400☏, shaft runout to 0.005 in. Some utilize a blocking feature that inhibits the free transfer of vapor contamination when the rotating equipment is cycled on and off. Isolators come in solid and split configurations and accommodate shaft diameters from 0.625 to 108 in. The two halves interact through mating grooves so the rotor turns with a rotating shaft, while the stator is pressed into a bearing housing. While bearing frequency harmonics and angular misalignment can separate traditional sealing systems, an isolator’s rotor and stator are unitized so they don’t separate during use. Called an isolator, this component keeps contamination out and lubricant in bearing enclosures for non-contact protection. There is a mechanical alternative to regular rubber bearing seals.
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