![]() Taking a system approach, we look at the bearing housing environment from an energy balance point of perspective. A fresh lookĪ simpler approach is required to take bearing lubrication protection to the next level. The time has come for a slightly different approach. Mag-face technology has been used to try to solve the problem, but with limited success. This technology struggles in environments where steam is present and does not effectively retain oil mist. When heavier contaminates, such as sand/dust and paper stock, enter the seal, expelling them is virtually impossible regardless of the internal geometry of the seal. One weakness is that, to get rid of contamination that enters the seal, it also allows contamination to enter the seal. This design has pros and cons, as any design does. By design, an expulsion port is required in a labyrinth seal to expel any contamination that enters the seal under dynamic conditions and to drain any residual contamination inside the seal after shutdown. Each application should be considered on a case-by-case basis.ĭynamic O-ring designs have a break-in period during which black dust collects around the expulsion port, which indicates something wearing or breaking in. Mag-face technology has its place and is preferred in some applications, but it tends to be on the fringe for many industrial pump applications. Therefore, increasing the complexity of a system by adding two or three more mechanical seals does not make sense when other technologies are available that will protect the bearings more effectively at a lower price point. Mag-face technology has had success in some applications, but the technology often performs inconsistently and is more sensitive to operating conditions than other technologies.ĭuring the last 30 years, pump reliability efforts have focused on keeping the mechanical seals alive. As with all mechanical seals, the faces must be lubricated, or they will overheat and fail. Magnetic-face (mag-face) seals are mechanical seals that use magnetic force to keep the contacting faces together instead of the springs and bellows that traditional mechanical seals use. Any application with limited work space.Conveyor belt idlers, where the replacement cost of a new idler is 25 percent of the cost of a set of bearing isolators.Engineered applications, which can have large shafts where a bearing isolator is not economically practical.Light-duty pumps and motors like those used in the food processing industry (in most situations, a set of bearing isolators do not make economic sense for these applications). ![]()
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