SXL Segmented Shaft Seals


 

SXL axial seal low res
Thordon SXL radial segmented shaft seal

Thordon SXL has a proven track record as a segmented shaft seal material replacing carbon graphite and phenolic seal segments.

  • Superb impact resistance - crack resistant from shaft misalignment or vibration
  • Custom engineered and CNC machined
  • Easy to install

Operating parameters for Thordon SXL segmented shaft seals are generally similar to those for carbon graphite  or phenolic seals in terms of maximum interface pressure and minimum leakage rate. Thordon segmented shaft seals have been designed for shafts up to 2000 mm (80") diameter. They can be designed for use in either radial or axial sealing systems. 

The main shaft seal of a hydro turbine usually operates under high PV-value conditions and may also be frequently exposed to abrasives in the water. Thordon segmented shaft seals are a proven solution working in both clean and abrasive laden water. 

The shaft seal may be located below or above the turbine guide bearing depending if a water lubricated or oil lubricated bearing solution is used. 

Thordon radial segmented shaft seals are able to operate with the maximum sealed water pressure up to 0.7 MPa (100 psi). An axial seal solution would typically be recommended for sealed water pressures greater than 0.7MPa (100 psi). 

Depending on the shaft size, number of segments, machining precision of segments, sealed water pressure and shaft speed, the amount of leakage can vary but will be lower than an equivalent carbon graphite segmented seal. For instance, a radial segmented seal consisting of 6 segments running on a 400 mm (15.75") diameter shaft, the leakage rate would be normally in the range of  10 - 20 L/min (2.6 to 5.2 US gal./min).

Additional advantages of the SXL segmented seal design include easy installation and replacement of all seal components without removing the shaft or disassembly of any major structural components. 



Documents

Technical Papers



References

Reference article of Thordon segmented shaft seals.



Design

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The final (fully finished) sizing of a Thordon elastomer or ThorPlas bearing can be determined by using the Thordon Bearing Sizing Calculation Program.

You cannot run the Thordon Bearing Sizing Calculation Program Version 2017, Release 10 without a User Registration Number. Once you have a User Registration Number you can download the Program below and enter it when prompted.

Click here to Request a Bearing Sizing Program User Registration Number

If you have a Bearing Sizing Program User Registration Number, you can download the program here



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    Thordon Hydro NewsWorks 2019

    Thordon’s web-based newsletter specifically developed for hydro and clean power users of oil-free and grease-free bearings. This newsletter includes feature articles about multiple successful turbine guide bearing conversions, T-G DNALOP purchasing a small hydro power plant in Poland, and a recent success of Thordon installed in a tidal energy application.
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    Sep 28, 2020
    New Zealand’s Genesis Energy has completed a first phase refurbishment of the 190MW hydro power plant at Lake Tekapo, in the South Island. Through its Auckland-based distributor Henley Group, Thordon supplied ThorPlas-Blue wicket gate bushes, Thorseal lip seals (which replaced nitrile rubber sealing rings in the lower and intermediate wicket gate bearings), and SXL operating ring wear pads. A new SXL turbine guide bearing, upgraded with better tolerances, was designed, supplied and installed. The shaft seal carbon segments were also replaced with SXL segments.
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    Thordon Experts Discuss 30 Years of Hydro Turbine Experience in a Series of Online Technical Seminars

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