Bearing isolator and grounding ring combination provides electrical protection for motor bearings
The new Garlock SGi Shaft Grounding Bearing Isolator protects motor bearings from electrical damage as well as from lubricant loss and contamination. Maintenance-free, the Garlock SGi bearing isolator combines the proven technologies of Garlock’s GUARDIAN non-sparking bronze labyrinth seal together with an AEGIS™ shaft grounding ring in a single unit.
It is ideally suited for motors controlled by variable frequency drives (VFDs) running pumps, fans, high-speed spindles, and other equipment in severe-duty applications such as mining and the processing of pulp/paper, food, pharmaceuticals, chemicals, and water/wastewater.
Commonly used to save energy, VFD’s induce motor-shaft currents that can damage bearings, completely wiping out any energy cost savings.
Standard bearing seals only keep out contamination and prevent leaks, but the Garlock SGi diverts harmful currents safely to ground, bypassing the bearings entirely and extending motor life. The patented AEGIS FiberLock Channel built into the Garlock SGi permanently secures circumferential rows of conductive micro fibres, preventing their dislocation and the resulting accidental contamination of the bearing.
The micro fibres themselves, proven in hundreds of thousands of installations to protect bearings from harmful currents, are engineered for flexibility to prevent breakage and ensure that the SGi will last for the service life of the motor.
Designed for long-term total bearing protection, the SGi also provides an IP56 non-contact isolation seal that withstands dust and powerful jetting liquids. It replaces contact lip seals and traditional bearing isolators commonly used in industrial applications and withstands operating temperatures from -30°C to 149°C (–22°F to 300°F). The unit is available for motor-shaft sizes ranging from 22.2mm to 152.4 (0.875 ins to 6 ins) in flanged, flangeless, and custom configurations.
Ref: Ga060-A
Issue date: November 2011
Photography and graphics:
Photograph enclosed or contact davidw@jonoliver.com
For digital file.
Issued by:
David Wickham, Jon Oliver Communications Tel: +44 (0)1902 757115
e-mail: davidw@jonoliver.com
Further information:
Gerry Morgan, Sales and Marketing Manager, Garlock (Great Britain) Ltd Tel: +44 (0)1422 313600 e-mail: gerry.morgan@garlock.com
Website:
Notes to editors
Garlock (Great Britain) Limited is, an EnPro Industries company (NYSE: NPO). Garlock is the acknowledged global leader in high-performance fluid sealing products. These include compression packing, gasketing, hydraulic components, dynamic seals, metal gaskets, high-performance metal seals and critical-service flange gaskets, as well as expansion joints. The company has 20 global operations employing more than 2,500 people and a distributor network that covers 75 countries. Its ? manufacturing facilities in the U.S., Europe, Asia and Latin America collectively produce the broadest range of fluid sealing products designed specifically for industrial applications.
Electro Static Technology (EST), inventor and manufacturer of the patented AEGIS™ Bearing Protection Ring, is a division of Illinois Tool Works, Inc., a diversified manufacturing company. EST is the global leader in conductive micro fibre shaft grounding technology.
Garlock Sealing Technologies LLC, an EnPro Industries company, designs, manufactures, and sells fluid sealing products worldwide.
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