At the Mezhdunarodnaya TPP, the maintenance of the Siemens SST-700 steam turbine, which has operated for about 130 thousand hours, has been completed. The work was carried out by specialists from Rus-Turbo. Following the repair, the equipment's service life is estimated for another four to five years of operation until the next scheduled major overhaul.
This is one of the rarest steam turbines of this type in the Russian energy sector. Only three Swedish-built Siemens SST-700 machines are operated in the country, two of which are installed at the Mezhdunarodnaya TPP.
One of the key stages of the repair was the high-precision alignment of the turbine's flow path before assembly. To check the geometry, engineers used not only laser measurements but also the classic method of applying patches to the rotor. This approach allowed confirming the results of digital diagnostics and ensuring the necessary alignment accuracy.
During the repair, two thrust-journal bearings manufactured by Rus-Turbo were also installed on the unit. The company produces a range of spare parts for steam turbines, including bearings, oil seals, and other critical components, which helps reduce dependence on imported components.
During the defect detection, specialists identified a number of technical issues. All discovered peculiarities were eliminated jointly with the power plant personnel, after which the equipment was prepared for further operation.
The Siemens SST-700 steam turbine belongs to high-power industrial turbines for combined cycle power plants. The design includes separate high- and low-pressure modules, which allows for efficient use of steam parameter differences. Depending on the version, the power of such turbines reaches 175–250 MW, and operating parameters include fresh steam pressure up to 165–180 bar and temperature up to 565–585 °C. These machines are designed for long-term continuous operation and are used in power plants where reliability and high efficiency are particularly important.