![]() Based on the applicable specifications, an appropriate bearing protection device can be chosen. Passing all specifications is not necessary for all applications it will be up to the equipment manufacturer or end user to decide which isolator to apply. In this device’s case, however, the rotor is held to a stationary face by a magnetic force, resulting in a positive seal for liquids.īelow is a Quick Reference Chart of general specifications for bearing isolators/seals. Similar to Labyrinth seals, magnetic face seals contain a stationary assembly and rotor to ensure no wear to the shaft surface. This positive seal eliminates leakage in applications where Labyrinths cannot (flooded, vertical down, and oil mist). Similar to concepts driving mechanical seals, magnetic face seals utilize lapped flat faces held together by magnetic force rather than mechanical energy to create a positive seal. This evolution lead ISOMAG to the latest isolator technology on the market today – the magnetic face seal. In these scenarios, the oil will inevitably solve the Labyrinth’s maze and leak out through the oil path.Īs time went on, the bearing isolator continued to evolve…adapting to the need for complete protection in all applications. One of which is the inability to seal in flooded, vertical down, and oil mist applications. While labyrinth isolators are effective in many applications, they have limitations of their own. The stationary fits the housing while the rotor fits the shaft and rotates with it. Dual Labyrinths contain two main components: a stationary and rotor. Labyrinths establish a restrictive oil path (or maze) to make it difficult for oil to leak out. The isolator first took form as a stationary Labyrinth and has evolved into today’s dual Labyrinth. In response to the wearing issue with lip seals, a new technology was born – the bearing isolator. This constant rubbing on the shaft leads to wear on both the seal and shaft, which eventually leaves a groove (fretting) on the shaft surface that can create a leak path. The seal remains stationary as the shaft rotates beneath it, and the contact between them causes rubbing. One of these flaws is causing wear on shafts. Unfortunately, lip seal technology is outdated, and these types of devices have some major flaws. Lip seals have been around since the 1920’s and are still one of the most common oil seals found in the field today. The first and most basic device for protecting bearings is the lip seal. Figure 1 below shows three common examples of such devices.įigure 1: Common types of bearing isolators/seals ![]() This article will cover general specifications that should be considered when choosing a device for bearing protection on rotating equipment. Considering that bearing failure is one of the leading causes of pump downtime, choosing the correct protection for the bearings on your process equipment is a “Maintenance First ” qualifier. If the bearings fail on a process centrifugal pump, production is interrupted, the equipment is shut down, time and money are spent replacing the bearings. Experience a flat tire and within minutes your travel is interrupted, the vehicle is stopped, time and money are spent replacing the flat. ![]() Contact our customer service team and we will help you find the ideal solution for your needs.Bearings are to pumps as tires are to cars. Since the installation in 2010 the customer has reported that the stray oil mist issue has been alleviated and the motors in the unit have cooler bearing housings.Ī quick reminder Isomag bearing isolators can be custom made to fit your machine. Low operating temperature – does not increase the operating temperature of the bearingsĮasy installation and removal – O-ring fit on the OD of the Isomag bearing isolator makes it easy to install and if necessary remove and reinstall. In addition to providing superior sealing and protection functionality the Isomag bearing isolators offer:Ī high level of MTBR – projected operating life of 100,000 hours at 12,000 sfm (60 mps) Isomag magnetic bearing isolators eliminate stray oil mist because they are a positive seal. A sales representative from John Crane introduced the refinery to Isomag magnetic face bearing isolators as the perfect solution to their growing problem.
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