![]() Because of the consistency of grease, the level of lubrication is not a concern. They can retain grease within the bearing chamber even during purging. Because grease does not dissipate heat as well as oil, adding another 100 degrees Fahrenheit to the operating temperature is recommended to ensure that the material can withstand the heat.īearing isolators are also suitable for use with grease lubrication. Operating temperature is an important consideration when selecting lip seal material. Custom bearing isolator with purge stream This helps prevent the seal from blowing out from purge pressure of the grease.įigure 4. In these instances, a metal case lip seal or cover plate that helps retain the seal in the bore is recommended. ![]() Applications in which no grease should ever escape the seal, such as those in the food industry, are exceptions. Lip seals are rarely installed with the lip oriented toward the grease. This configuration prevents contamination of the grease by water or dirt and allows it to be purged under the lip if the discharge port becomes plugged or otherwise obstructed. Lip seals are suitable for use with grease lubrication, since only one seal installed facing the external environment is typically needed. Grease purging is a common practice, but should only be carried out with an understanding of the grease flow’s effect on the seal. This allows fresh grease to be pumped into the bearing chamber, replacing degraded or contaminated grease. Most equipment designed for grease lubrication is equipped with a purge stream. Its consistency makes it easy to seal within bearing chambers. Grease is an easy lubricant to apply and maintain, and it can be used to prevent contamination. Components of a bearing isolator with the labyrinth pathway highlighted in yellow Grease Purge Depending on the direction of the installed seal, it will either prevent egress of lubrication or ingress of contamination (see Figure 2).įigure 3. Their geometry is important for maintaining an optimal radial load on the shaft to develop a meniscus of oil on which the lip can ride, which reduces friction and wear on the shaft and lip (see Figure 1). Lip seals are unidirectional contact type seals. Lip seals and labyrinth seals, also known as bearing isolators, are the most common solutions. Selecting the right seal for a lubrication system will yield the best bearing protection. Methods for sealing the gap between a rotating shaft and the stationary bore have evolved with advances in lubrication and lubrication delivery systems. Lubrication starvation and contamination are the principal factors that cause premature bearing failure, so systems have been developed to prevent these issues. Because they support the shaft, bearings are prone to wear and damage. ![]() If they fail, the equipment has to be repaired or replaced. This rotating equipment ensures process flow and the safety of employees and the surrounding community.īearings are critical to the reliability of rotating equipment. ![]() By preserving optimal performance reducing or eliminating oil mist spray and controlling temperature, moisture and contaminants, our bearing seals can ensure that your valuable equipment operates as intended for decades to come.Within the oil and gas industry, the rotating shafts of equipment-such as pumps, motors, compressors, gearboxes and turbines-perform an essential function in both upstream and downstream applications.
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