Type-28ST-Seal-john-cran
Type-28ST-Seal-john-cran

Features mechanical seal type 28st

  • California Residents: PROPOSITION 65 WARNING
  • Bearing oil steam contamination reduced.
  • Standard designs fit most single-stage turbines.
  • Reduced noise levels and hazards associated with leaking steam.
  • Support equipment eliminated.
  • Unidirectional and bidirectional capability.

Recommended Applications type 28st

  • Steam turbines
  • Driven machinery

About Mechanical seal type 28st

Type 28ST combines proven rotating groove technology and high-temperature secondary seals to reduce steam leakage by nearly two orders of magnitude, as compared to traditional sealing devices, such as segmented carbon rings and labyrinths. This steam-lubricated, end-face cartridge seal reacts instantaneously and automatically to maintain a safe face gap despite sudden changes in operating conditions. A stable seal face gap, typically 0.0001″ to 0.0002″/0.0025mm to 0.0051mm, is the result of specially designed rotating grooves, which pump steam radially inward into a nongrooved portion of the seal known as the “sealing dam.”

Design Features mechanical seal type 28st

  • Bearing oil steam contamination dramatically reduced
  • Increased safety (reduced noise levels and hazards associated
    with leaking steam)
  • Standard designs to fit most single-stage turbines
  • Turbine operational efficiency maintained for years
  • Support equipment eliminated
  • Bi-directional face patterns available

Material mechanical seal type 28st

  • Face/Primary Ring: Carbon
  • Seat/Mating Ring : Tungsten Carbide
  • Secondary Seals : Carbon/Inconel®/Flexible Graphite
  • Hardware: 410 Stainless Steel
  • Springs: Inconel® X-750
  • Fasteners: Zinc-Coated Hardened Steel

Operating range mechanical seal type 28st

  • Temperature Limits
    40°F to 500°F/-40°C to 260°C

  • Pressure Limits
    400 psi(g)/27.6 bar(g)

  • Speed Limits
    400fps/122m/s

  • Size Limits
    6.5″/165mm

     

Product Description type 28st

  • Type 28ST combines proven rotating groove technology and high-temperature secondary seals to reduce steam leakage by nearly two orders of magnitude, as compared to traditional sealing devices such as segmented carbon rings and labyrinths.
  • This steam-lubricated, end-face cartridge seal reacts instantaneously and automatically to maintain a safe face gap despite sudden changes in operating conditions
  • A stable seal face gap, typically 0.0025mm to 0.0051mm/0.0001″ to 0.0002″, is the result of specially designed rotating grooves, which pump steam radially inward into a nongrooved portion of the seal known as the “sealing dam”
  • Primarily for use on steam turbines