Mechanical seal john crane
Type 28AT
Non-contacting Gas Seal for Turbo Compressors Type 28AT
ype 28AT: The original gas seal, with a design pedigree stretching back over 30 years and evolving gradually, installed and proven in thousands of compressors all around the world and remaining the preferred seal choice for many customers. Type 28 compressor dry-running gas seals have been the industry standard since early 1970 for gas-handling turbomachinery. Utilizing John Crane’s patented spiral groove pattern, these seals are non-contacting in operation. During dynamic operation, the mating ring/seat and primary ring/face maintain a sealing gap of approximately 0.0002″/5 microns, thereby eliminating wear. These seals eliminate seal oil contamination and reduce maintenance costs and downtime. Single, tandem and double seal arrangements are available.
Product Description Type 28AT
Type 28 compressor dry-running gas seals have been the industry standard since the 1970s for gas-handling turbomachinery. Utilizing John Crane’s patented spiral groove pattern, these seals are non-contacting in operation.
- During dynamic operation, the mating ring/seat and primary ring/face maintain a sealing gap of approximately 0.0002 in./5 microns, thereby eliminating wear
- These seals eliminate seal oil contamination and reduce maintenance costs and downtime
- Single, double opposed, and tandem cartridge seals are capable of handling a wide variety of gas sealing applications in the gas collection/transmission, refining, chemical and petrochemical processing industries
Table Parameters Type 28AT
| Temperature Limits | -4°F to 392°F/-20°C to 200°C, dependent on overall duty conditions
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|---|---|
| Pressure Limits | 1,450 psi(g)/100 bar(g)
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| Speed Limits | 394fps/120m/s
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| Size Limits | 12.125″/308mm
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Features Type 28AT
- California Residents: PROPOSITION 65 WARNING
- Cartridge design
- Unidirectional or bidirectional capability
- Single, double-opposed or tandem configuration
- Robust design with unparalleled field-proven pedigree
Recommended Applications Type 28AT
- Centrifugal compressors
- Other compressors