Mechanical seal john crane
Type 28ST
Non-contacting Gas Seal for Steam Turbines 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.”
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
Table Parameters 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 |
Features 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