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.