Brush Seals

Increase Operational Efficiencies

Compliant brush sealing systems from Waukesha Bearings can be applied to a wide variety of rotating equipment in air, steam, or process gas applications to reduce the leakage gap between the sealing surface and rotor.

The compliancy of a brush seal allows the bristles to deflect with minimal wear, thereby maintaining a small leakage gap over time and increasing operational efficiencies.

501F gas turbine brush seals
No. 2 Bearing brush seal installed on a gas turbine

Valuable Savings

The uniqueness of our product rests with its flexible sizing and replaceable bristle pack. These two features alone are technology differentiators and provide the benefits of quick turn times, ease of installation, and seal repair.

These benefits coupled with efficiency gains provide valuable savings in solving your critical sealing needs.

Brush seals have been shown to reduce labyrinth leakage by up to 80%.

Aerospace Origins, Industrial Success

Our patented brush seal (US Patent 6,231,047) was originally developed for the aerospace industry. First installed in the 1980s in efforts to improve jet engine efficiency and reduce airborne pollutants, brush seals have since accumulated millions of successful operating hours.

Our experience has taken the technology beyond aerospace into the harsh and demanding environments of industrial turbomachinery, where we now have more than 1,600 units in operation.

Brush seal technology

Technical Data

  • Pressure: Up to 300 psid (20 bar) per row
  • Temperature: Up to 650°C (1,200°F)
  • Surface speed: Up to 335 m/s (1,100 ft/sec)
  • Environments: gas path (air, steam); bearing (air/oil)
  • Housing material: stainless steel, Inconel, others
  • Bristle material: Haynes 25
  • Diameter: 19 mm (0.75″) to more than 3,050 mm (120″)
  • Configurations:
    • Solid ring
    • Split ring
    • Segmented
    • Cartridge
    • Linear strip
Brush seal replaceable bristle pack
Augmented labyrinth brush seal

Augmented Labyrinth Brush Seals

Augmenting labyrinth seals with brush seals is a simple and effective approach to reducing clearances and eliminating potential problems from shaft contact wear.
Gas turbine brush seal

Gas Turbine Brush Seals

Industrial gas turbines have adopted the brush seal in three primary locations: the bearing housing, high pressure packing (HPP) sealing and hot gas path interstage sealing.
Steam turbine brush seal

Utility Steam Turbine Brush Seals

Three locations of brush seal implementation are typically considered in utility steam turbines: end-packing seals, interstage shaft seals, and turbine bucket tip seals.

Waukesha Bearings Advantage

  • Engineering expertise to analyze complete rotor-bearing system dynamics
  • Installation list of more than 1,600 units
  • Lasting efficiency gains
  • Low-profile design
  • Flexible sizing
  • Modular assembly for up to 30% reduction in replacement costs
  • Easy to install
  • Quick turnaround times