Type 28EXP Dry Gas Seals | John Crane Mechanical Seals
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Type 28EXP

Non-contacting Gas Seal for Turbo Compressors

Type 28EXP: The product for the most challenging and hostile environments with proven and independently audited performance to 425 bar(g). 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.

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  • California Residents: PROPOSITION 65 WARNING
  • Cartridge design
  • Unidirectional or bidirectional capability
  • Single, double-opposed or tandem configuration
  • Robust design with unparalleled field-proven pedigree


Temperature Limits

-220°F to 600°F/-140°C to 315°C, dependent on overall duty conditions

Pressure Limits

6,500 psi(g)/450 bar(g) across single stage

Speed Limits


Size Limits


Recommended Applications

  • Centrifugal compressors

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