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JOHN CRANE MECHANICAL SEALS |
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 John Crane 28AT - Gas Lubricated, Non-contacting Gas Seals For Turbo Compressors
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.
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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.
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Quick specs
| Temperature |
-140°C to 315°C
-220°F to 600°F |
| Pressure |
Up to 450 BARG/6,500 PSIG across single stage |
| Speed |
Up to 200 m/s / 660 fps |
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Features
Mating Ring
Shrouded mating ring prevents secondary damage in the event of a mating ring fracture.
Leakage
Low-level leakage can be vented to a safe area, used as fuel to drive equipment, or returned to process via a low-pressure ejector.
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