The new TDGS elastomer-free, high-efficiency, gas-lubricated seal is well suited for use in single-stage
The new TDGS elastomer-free, high-efficiency, gas-lubricated seal is well suited for use in single-stage steam turbines in the petrochemical and chemical industries. The sealing face of the rotating seat is machined with three-dimensional V-grooves. The V-groove is notable for its inclined groove bottom. With no sharp edges at the groove exit where dirt particles can accumulate, all particles are drawn through the sealing gap. Dirt deposits are prevented and a self-cleaning effect is thus achieved.
The manufacturer employs metal bellows as a secondary seal for the stationary seal face; this helps ensure interruption-free operation. An operating pressure limit of 25 bar and the attainable sliding velocity 120 m/s open up an extensive range of uses in steam turbines with shaft diameters of up to 180 mm. The seal also prevents the formation of dense fogging around the turbine at low external temperatures. Other features include:
No steam condensate in the bearing oil
Reduced temperature gradient between seal and bearing
Great turbine efficiency
Amortization period is less than one year
Stationary metal bellows
SiC-Si/carbon graphite as the combination of face materials
Statotherm secondary seals
Bellows made from Inconel
Open gas seal grooves with self-cleaning effect
Pressure reversal permitted (vacuum mode)
Designed as cartridge unit
Burgmann, Feodor, Dichtungswerke Gmbh & Co, Postfach 1240, Wolfratshausen, ?? 82502. Tel: 49-8171-230; Fax: 49-8171-231214.