Custom-Engineered for Efficiency
Labyrinth seals are a critical component applied across rotating equipment to seal high pressure areas from low pressure areas and prevent contamination of the process. Designed as a non-contacting seal with a precise clearance over the rotor, labyrinth seals directly affect equipment efficiency.
As with all Bearings Plus solutions, our labyrinth seals are custom-engineered for each application. Design factors include seal arrangement, operating temperatures, pressures, speed, process make-up, and thermal expansion, among others.
Reduce Clearances with Thermoplastics
To improve efficiency, particularly in multi-stage centrifugal compressors, Bearings Plus applies thermoplastic labyrinth seal solutions. The abradable nature of thermoplastics allows a labyrinth seal to be designed to a tighter clearance than a metallic labyrinth seal would be.
If a metallic labyrinth seal were to experience a transient rub during machine start-up, or a hard rub during operation, the teeth of the seal could cause expensive damage to the rotor through wear or galling. A large clearance is therefore designed to avoid shaft contact.
The thermoplastic labyrinth seal can experience rubs without causing rotor damage, as it is both abradable and has anti-galling properties. Smaller clearances can be designed with the thermoplastic material, reducing leakage and improving machine efficiency.
Thermoplastic labyrinth seals can be applied at the impeller eye, interstage and/or balance piston locations.
Thermoplastic Laby Seal Advantages
- Tighter seal clearances
- Reduced leakage
- Improved efficiency
- Option of straight or slanted teeth
- Corrosion resistance for operation in a variety of fluids
Thermoplastic Material Options
- Torlon® polyamide-imide*
- Fluorosint® enhanced PTFE†
*Torlon® is a product and registered trademark of Solvay.
†Fluorosint® is a product and registered trademark of the Quadrant Group.
- Land-based gas turbines
- Utility steam turbines
- Centrifugal compressors
Augmented Labyrinth Seals
Labyrinth seals augmented with Bearings Plus brush seals can reduce sealing clearances to reduce leakage and improve machine efficiency.