In addition to replacing existing brush seals in rotating equipment, Waukesha Bearings can upgrade machinery by augmenting labyrinth sealing systems.
Over time, labyrinth seal clearances are compromised through erosion and material removal stemming from factors such as rotor-stator interaction due to high imbalance loading or transient excursions due to asymmetric thermal growth between the rotor and casing. Additionally, since labyrinth seals are rigid geometry seals and are not capable of bending to accommodate rotor excursions, design clearances are engineered to account for all phenomena affecting clearance closures in the machine. Because of the brush seal’s compliancy – its ability to bend – sealing clearances can be significantly reduced, thus increasing machine efficiency and power.
The low profile of our patented bristle strip allows simple and cost effective integration with an existing labyrinth seal.
When augmenting labyrinth seals, Waukesha Bearings utilizes the existing labyrinth blade and teeth to create a back plate. Wire EDM ensures precise and reliable clearances for the labyrinth’s augmentation to accept the brush seal.
Waukesha Bearings has upgraded a large number of equipment with augmented labyrinth seals, including process steam turbines, centrifugal compressors and turbo-expanders.