Seals for Steam Turbines
The Type 28ST non-contacting steam seal is a proven solution offering outstanding operating performance for industrial steam turbines.
The Type 28ST is a single-stage, non-contacting, gas-lubricated seal featuring a unique spiral-groove design for low- and high-speed applications across equipment operating in both transient and continuous modes.
It is designed to replace conventional sealing devices — segmented graphite rings and labyrinth seals — and can be installed in an internally or externally mounted chamber without turbine modification.
Materials
- Face — antimony-impregnated graphite
- Seat — tungsten carbide or a coated ductile substrate
- Metal components — 410 stainless steel
- Secondary seals — Inconel® and split carbon rings
(Crane-Foil®) - Springs — Inconel®
X-750
| Parameter | Type 28ST |
| Temperature, °С | up to 400 |
| Operating speed, rpm | |
| Turning gear speed, rpm | 1,000 |
| Axial movement, mm | ±3,2 |
| Radial movement, mm | ±0,6 |
| Pressure, bar(g) | up to 27,6 |
| Shaft diameter, mm | 25,4 to 165,1 |