John Crane 881 Replacement Seal

 the John Crane 881 cartridge seal provides a versatile, easy-to-fit sealing solution with robust pressure, temperature, and speed characteristics. Ideal for industrial pumps across multiple sectors, it delivers reliable performance with minimal maintenance.

• Metal Components: Precision-machined gland and sleeve, typically SS316 or similar corrosion-resistant alloys .

• Seal Faces: Carbon graphite vs silicon carbide or tungsten carbide—available in balanced configurations depending on pressure needs.
  
  Drive Mechanism: Positive set‑screw drive; option for rotating‑seat (RS) for high-speed applications
  
  
  

  Operating Performance

   

  • Temperature Range: –40 °C to +260 °C (–40 °F to +500 °F), depending on material choices .

  • Pressure Rating:

    • 8‑1: ~22.8 bar (325 psi)

    • 8‑1T (narrow version): ~13.8 bar (200 psi)
      .
      Type 8B1/8B1T variants (high-pressure) offer higher ratings, up to 76 bar .

  • Speed Capability: Up to 25 m/s (~5,000 fpm); rotating‑seat option allows higher speeds
    
    
    

    Applications & Suitability

     

    • Ideal for general-purpose industrial pumps in chemical, petrochemical, water, and oil & gas sectors.

    • Suitable for high-pressure, high-speed applications when using balanced Type 8B1 variants or rotating-seat versions.

    • Certification & Compatibility: Meets industry norms like API, ISO for cartridge / pusher seals. Fully compatible with seal support systems and face technologies from John Crane