August 2007

Special Report: Liquefied Natural Gas Developments

New floating-ring seals push the 'uptime envelope'

The three-face design handles severe wet-fluid pumping

Bloch, Heinz P., Hydrocarbon Processing Staff

Mechanical seals are used for fluid containment duties in literally hundreds of millions of fluid machines. These seals continue to be designed and manufactured in numerous configurations and employ many different materials of construction. Some seals incorporate a single set of faces and are intended for the more routine applications, while others are comprised of multiple sets and are primarily intended for hazardous or difficult-to-seal applications. In general, for each set of seal faces, one face is stationary and the other rotates at shaft speed (Fig. 1).     Fig. 1   

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