Best Practices for Sealing High Pressure Boiler Circulating Pumps

High pressure boiler circulating pumps found in medium to large (200 to 1,000+ megawatts [MW] fossil-fueled power plants represent challenging application conditions for mechanical seals with seal chamber pressures in the range of 3,000 pounds per square inch gauge (psig), or 207 barg (gauge pressure), and process water temperatures of up to 700 F (371 C).

These pumps are typically single-stage vertical pumps designed to provide high flow rates with low pressure differentials, with two to five of these pumps being installed on a single boiler unit. The pumps are normally installed in a parallel configuration and are critical to maintaining an even temperature distribution in the boiler and do not typically have an installed spare pump.

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