Improving Equipment Uptime - Power （改善设备运行时间电力）.pdf

Improving Equipment Uptime COMPOSITE SEALS MEET THE CHALLENGE Chris Tones and David C. Roberts Advantages of Composite Seals Management Summary The concept of utilizing a bearing surface for rotating ma- In an industrial application, equipment chine members dates back over 5,000 years. Evidence sug- uptime is vital for on-time performance and gests that lubrication was used on bearings as early as 1400 profitability. The rotating members of in- B.C. (Ref. 1). By the 1800s, the Industrial Revolution created dustrial machines are subject to the highest demands for more sophisticated lubrication systems (Ref. 2). degree of wear and are more susceptible to In order to retain lubrication, a sealing system was needed. failure than non-moving parts. Bearing sur- Originally, seals consisted of either leather straps or braided faces are the most critical and often the most rope. By the 1920s, lip seals made of leather were being pro- expensive portion of the rotary assembly; it is duced. The 1930s and 1940s saw development of the synthetic imperative to protect these components. The rubber oil seal, which is still in use today. The most common primary protector of these components is the radial lip seal (or oil seal) design is the metal-cased seal. A industrial seal. Composite seals are a signifi- molded rubber-sealing element is captured inside of a carbon