Type 93FR
The Type 93FR is a non-contacting carbon bushing designed to protect dry gas seals from bearing oil ingress. By injecting separation gas between two segmented bushings, it creates a pressure barrier that prevents oil migration, extending seal life and reducing wear. With advanced materials and design, it ensures long-lasting, reliable performance.
| Feature | Specification |
|---|---|
| Type | Non-contacting carbon bushing (floating ring separation seal) |
| Function | Protects dry gas seals from bearing oil ingress by creating a pressure barrier with separation gas |
| Size Range | 1.57" to 14.76" (40 mm to 375 mm) with sleeves to fit all metric or imperial shaft sizes |
| Operating Temperature Limits | -40°F to 450°F (-40°C to 230°C) |
| Speed Limits | Up to 430 fps (130 m/s) |
| Maximum Operating Differential Pressure | 7.5 psi (0.5 bar) |
| Recommended Operating Differential Pressure | 0.75 to 1.5 psi (0.05 to 0.1 bar) |
| Separation Gas | Nitrogen or air, suitable irrespective of dew point |
| Materials of Construction | Carbon bushing segments, stainless steel garter spring and housing assembly; alternatives available |
| Gas Consumption | Low gas consumption due to low operating pressure and optimized segment design |
| Design Features |
- Non-contacting for longer life and low heat generation - Self-centring design - Universal design independent of shaft rotation - Retrofit capability for many traditional carbon bushings - Segmented bushings to prevent oil migration |
| Typical Applications | Centrifugal compressors, IG compressors, turbo compressor machinery, natural gas pipelines, refineries, propylene and ethylene compressors |
| Operating Environment | Bearing housing should be well drained and not pressurized; vibration levels compliant with API 617 |
| Installation | Cartridge design with optional oil slinger/deflector to enhance oil ingress prevention |
| Gas Filtration Requirement | Separation gas filtered to 10 microns and dry |
| Speed Capability | Up to 25,500 feet per minute (approx. 130 m/s) |
| Additional Notes |
- Bi-directional operation - Eliminates fallback and hang-on phenomena - Operates at low nitrogen pressure (0.02–0.25 bar) compared to older seals - Proven upgrade to contacting seals (e.g., T-82, T-83) with better reliability and oil migration control |