The seals are for use with light hydrocarbons of specific gravities between 0.40 and 0.60, such as ethane, ethylene, propane, propylene, and butane — liquids that have a tendency to flash from liquid to vapor at ambient pressure and temperature conditions. The seal features Precision Face Topography where smooth, lowamplitude patented wave patterns are laser-machined onto the seal face, creating a stable hydrodynamic effect. The seals operate in light hydrocarbon services with lower vaporpressure margins — between 5 and 50 psi. Operating range includes pressures from 0 to 750 psi, temperatures between 40 and 400°F, speeds between 20 and 75 fps, and sizes between 1.750 and 5.125 in.

Flowserve Corp., 5215 N. O'Connor Blvd., Suite 2300, Irving, TX 75039, (972) 443-6800,