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In contrast to surface or protective layers, deposits are unwanted effects which impinge upon the values necessary for optimum operation of the centrifugal pump

Examples of deposits

  • By corrosion products
  • By salts (e. g. carbonates, sulphates, phosphates) due to a chemical imbalance (see water hardness,  pH value
  • By precipitation of dissolved salts from the evaporation of water (e. g. on shaft seals
  • By colloids (particles dispersed in another substance) or coarsely dispersed substances (which are not, or only slightly, dissolved in or chemically bonded with each other)
  • By sand (see Erosion)
  • Fouling (e. g. algae, bacteria) in sedimentation, brackish water and seawater tanks



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