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Mitrofanevskoe Highway, 8AB

Demounting a 34 tons diesel genset and installing new 1 MW diesel gensets for MRSK Severo-Zapada (Rosseti)

Total capacity 2000 kW
Client ПАО «МРСК Северо-Запада» (бренд “Россети Северо-Запад”)
Фото
Task

Modernizing diesel gensets for Rosseti: replacing an old USSR diesel genset in the city of Menzen, Arkhangelsk region.

Solution

In 2020, the Techexpo construction unit won the tender based on 223-FZ for the technical upgrading of a high-voltage diesel genset relating to the replacement of two 1 MW diesel generators. The works were carried out for ‘MRSK Severo-Zapada’ PJSC (‘Rosseti) away from civilization, in the city of Menzen, a place difficult to reach even by transport.

The two G-72M diesel gensets were demounted (34 tons each!) with the following restoration of a wall section of the diesel genset building.

The G-72M diesel gensets decommissioning activities included oil and fluid discharge, turning off exhaust and fuel systems, disconnecting cables. Then the diesel gensets were dismantled element by element, unloaded and disposed. Demounting and loading the frame (weight – 6-7 tons), the assembly (5 tons), the bent shaft (3,8 tons) required demolishing a part of the brick wall with window openings.

According to the project of the construction organization, the following works were done:

  • demounting two sections of the wall with windows to the lintels;
  • demounting G-72M-type diesel gensets-5 and 2;
  • mounting the bed frame of the recovery boiler;
  • mounting the recovery boiler;
  • making an opening in the wall for diesel genset-5 exhaust system;
  • mounting the diesel genset-5 heat recovery boiler;
  • modifying the diesel genset-5 exhaust pipe with due account for placing the diesel genset-5 recovery boiler mounting of the project diesel gensets;
  • reconstructing the sections of the walls with window openings;
  • excavating pits;
  • constructing the foundations of the diesel genset cooling units;
  • mounting the assemblies of the diesel genset cooling units;
  • mounting communications for diesel genset connection.

Following the foundation preparation (see drawing in the tab below), the new 1 MW diesel gensets were loaded in the premises using special carts making it possible to move heavy, bulky few-tons cargos over the floor.

The following items were assembled:

  • a remote electric radiator (dry cooler);
  • an auxiliaries board, a lighting switchboard (cooling), a pump switchboard (cooling), a requirements management system;
  • a remote control panel;
  • a coolant system and a fuel system;
  • a gas venting system with adjusting the length of pipes and supports;
  • relay protection, diesel generator set grounding;
  • 6 kV cable lines.

As a part of pre-commissioning activities, following the individual tests program using the electrical laboratory, we tested the synchronous generator and power cable, measured the grounding device resistance, checked relay protection and automatic equipment, the presence of an electrical circuit between the grounded units and grounded genset elements, the response of automatic switch breakers, L-N loop resistance by direct measuring of electric equipment body single-phase short circuit current.

The project technical complexities can be seen in the photo gallery below and in the tab with drawings.

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