Industrial bearings for power engineering

Stator blades in pumps and turbines

PRODUCT USED

KS Permaglide® plain bearing bush design PAP … P11
Material: Permaglide® KS P11

FUNCTION

In storage power stations, water is pumped into higher-lying storage reservoirs using cheap night-time electricity. At energy demand peaks, the water is allowed to flow back down to drive a turbine. In the process, the turbine drives a generator to produce electricity. In order to set the optimum operating point in the pump as well as in the turbine operation, swivelmounted stator blades are fitted between the ring channel and impeller.

DEMANDS

The plain bearing has direct contact with the water. High static compressions arising from the flowing medium permanently affect the bearing. In addition, there are high-frequency vibrations.

BEARING WITH KS PERMAGLIDE® P11 PLAIN BEARING BUSHES

The bearing for the stator blades are manufactured with maintenance-free plain bearing bushes made from KS Permaglide® P11. This has eliminated the need for additional lubricant.

The material with bronze backing and PTFE sliding layer does not display any signs of corrosion. Similarly, tribocorrosion does not occur because the sliding metals are separated by the layer of PTFE.

KS Permaglide® P11 does not absorb any water, allowing the plain bearing to maintain its dimensions. Moreover, the high wear resistance always provides a constant operating bearing clearance, which would otherwise have a negative influence on the efficiency of the pump or turbine. The service life of bearings made of KS Permaglide® P11 is thus exceptionally long, with costly maintenance intervals being reduced.

ADVANTAGES OF KS PERMAGLIDE® P10 PLAIN BEARINGS

  • Does not absorb water
  • Largely resistant to swelling
  • High corrosion resistance thanks to bronze backing, no additional corrosion protection required
  • Maintenance-free
  • Low wear
  • Good chemical resistance, especially suitable for use in aggressive media
  • Operating temperature range of –200°C to +280°C
  • Very low stick-slip tendency
  • Low friction value

DESCRIPTION OF MATERIAL

KS Permaglide® P11 is a leaded, robust bearing material that has the highest levels of tribological performance.

The material is designed for maintenance-free, dry-running applications, but can also be used in systems with liquid or grease lubrication. Grease as a lubricant in contact with KS Permaglide® P11 is only conditionally possible and not recommended.

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