Yesterday’s problem: Electrochemical corrosion of sliding faces

Converting the water chemistry from alkaline to combination or neutral operation and using increasingly powerful feed water pumps caused electrochemical corrosion which considerably reduced the operating periods of mechanical seals at many power stations. This damage phenomenon, which leads to the destruction of face materials, had been particularly observed in large boiler feed pumps with high circumferential velocities.

Causes of electrochemical corrosion

  • Boiler feed water with a pH value below 9 and its associated extremely low electrical conductivity.
  • Pumps with circumferential velocities of over 35 m/s (115 ft/s) promote the build-up of electrical potential at the shaft seal.
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The Eagleburgmann Group

Sealing technology for plants and machines

EagleBurgmann is one of the worldwide leading providers of industrial sealing technology. Mechanical seals, seal supply systems, magnetic couplings, carbon floating ring seals, expansion joints, gaskets and packings as well as comprehensive services are used wherever reliability and safety are needed.

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What makes us stand out is our excellent quality, great innovative capacity, and an extensive product portfolio for nearly all industrial processes and fields of application. Our product portfolio includes everything from mechanical seals and seal supply systems to magnetic couplings, carbon floating ring seals, expansion joints, and gaskets and packings as well as comprehensive services. Since we are part of the German Freudenberg and Japanese EKK group, we have all the necessary resources for a firmly based reliable partnership.

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