Boiler circulating pumps are among the most critical and difficult rotating equipment in power plants. The bearings and seals are subject to very high loads with respect to forces and temperatures. Typical operating pressures range between 2,000 and 3000 psi, feed water temperatures between 600-700°F. In 1999 a power plant in Texas made the decision to forgo the typical sealing method (a series of floating rings in combination with a high-pressure water injection system) and seek a complete mechanical sealing system solution. Today, about 60 pumps are in operation with the new mechanical sealing solution with very good reliability results.
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