Reference: Front admission (SST-600) footprint turbine
The customer, who is active in oil refinery sector and the fuel and lubricant market, operated an old steam turbine (Type: TuW-2) first commissioned in 1969. After almost 50 years of operation, in 2018, substantial wear and tear was present on all turbine components. In order to restore the production and reliability of his turbine, the customer was interested in a footprint solution and got in contact with Siemens Energy because of a good relationship, the technical expertise and OEM know how.
Since the customer wanted to re-use his spare parts (especially the available two spare rotors), it was mandatory from the beginning to fit the new turbine into the existing plant configuration and to minimize modifications on site by re-using of foundation as well as oil and seal system. To meet this objective the chosen turbine type was a 1:1 copy of the original one (TuW-2), manufactured with the same outer dimensions and flange conections for shortest possible exchange on site.
For improvement of reliability the footprint turbine was equpipped with an upgraded Siemens electronic control and protection system (SPPA-T3000).
The turbine was manufactured in Germany and after a crucial delivery time of about 13 months, the turbines were exchanged and the project was completed. By reason of the footprint design, the production losses were kept at a minimum and a reliable turbine operation was achieved. Furthermore, investment costs for new spare rotors were saved and the warranty of the turbine was extended.
Shown in below figure, considering production losses per day, the footprint concept was the better choice for the customer compared with a regular overhaul with required repairs of the aged machine.