Type-28AT-Seal-john-cran
Type-28AT-Seal-john-cran

Features mechanical seal 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

About Mechanical seal type 28at

Type 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.

Design Features mechanical seal type 28at

  • Shrouded mating ring prevents secondary damage in the event of a mating ring fracture
  • 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

Operating range mechanical seal type 28at

  • Temperature Limits
    -4°F to 392°F/-20°C to 200°C, dependent on overall duty conditions

  • Pressure Limits
    1,450 psi(g)/100 bar(g)

  • Speed Limits
    394fps/120m/s

  • Size Limits
    12.125″/308mm

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