Overhaul of fluid coupling VOITH 682 SVNL 33G at Kharanorskaya State District Power Plant

Kharanorskaya GRES is the largest thermal power plant in Eastern Transbaikalia and the most powerful station of the Transbaikal energy system. The station makes a huge contribution to the development of the region. Electricity generation at the Kharanorskaya State District Power Plant is more than 2.7 billion kWh per year.

In connection with the planned shutdown of power unit No. 3 of the Kharanorskaya State District Power Plant, it is necessary to ensure a capital overhaul in a short time repair of VOITH fluid couplings 682 SVNL 33G, operated as part of critical mechanisms - PEN-3A, PEN-3B.

The equipment was overhauled in accordance with the requirements of the VOITH TURBO manufacturer's guidelines and as part of scheduled equipment maintenance in order to restore the functionality and increase the reliability of the unit.

All service workperformed on the territory of the Kharanorskaya State District Power Plant, provided support and technical guidance from certified EnergoFront service engineers.

V task EnergoFront included ensuring the implementation of a set of measures for the overhaul of fluid couplings VOITH 682 SVNL 33G consisting of:

• dismantling fluid couplings and disassembling the oil system of units;

• packaging and transportation of fluid couplings to a specialized repair site;

• dismantling fluid couplings, assessing technical condition;

• replacement of components, elimination of other identified defects;

• assembly of fluid couplings and preparation for return transportation;

• installation of fluid couplings into the unit at the site and assembly of oil systems;

• commissioning and recommissioning of boiler feed pump units.

The overhaul of VOITH 682 SVNL 33G fluid couplings was carried out at an equipped repair site equipped with specialized tools and with the support of the manufacturer's experts.

During the repair of fluid couplings a set of works has been completed:

• disassembly and troubleshooting – wear of bearings, seals and gears is detected;

• replacement of worn components – original VOITH TURBO spare parts are installed;

• assembly – setting gaps and fitting parts;

• balancing – dynamic balancing was carried out to minimize vibrations;

• hydraulic tests – checking tightness and operating pressure;

• technical reports – preparation of reporting repair documentation.

Carrying out repair work at a specialized site made it possible to carry out the work efficiently and in a short time!

At the final stage of repair work at the Kharanorskaya State District Power Plant installation completed on the frame of boiler feed pump units PEN-3A, PEN-3B fluid couplings that have undergone major repairs, reverse piping completed equipment and connection of related systems with replacement of hydraulic oil, alignment performed unit shafts.

Launches were carried out within the timeframe agreed with the Customer two units of boiler feed pumps PEN-3A, PEN-3B. The power plants were brought back to operating parameters together with the start-up of power unit No. 3 after the completion of repair work.

The results of repair work will provide confirmation of the reliability of operation and the required operating indicators of the feeding installations of the Kharanorskaya State District Power Plant for the next overhaul period.

Project achievements