MAJOR OVERHAUL ABB VE 36 A 8640 kw cogeneration steam turbine

After 10 years of continuous production, an ABB turbine, in a cogeneration configuration, was entrusted to Energetic to carry out a major overhaul. During the preparation a no stop inspection was carried out. As a result, it was decided to execute on the generator only di-electrically measurement and to pay special attention to the efficiency loss the turbine had to deal with.

MAJOR OVERHAUL ABB VE 36 A  8640 kw
Complete steam path inspection carried out on site

Simultaneously with the rotor repair, all necessary inspections were carried out, including gearbox and oil system inspection (typical for the energetic 360° inspection service).
During the rotor inspection it was found that the last row of blades showed strong erosion wear.
Energetic immediately took action after consultation with the customer and newly produced the last row of blades using the reverse engineering technology.

MAJOR OVERHAUL ABB VE 36 A  8640 kw
Left the old, right the new last row blading (re-)installed with damping wire and locking pins.

Energetic - MAJOR OVERHAUL ABB VE 36 A  8640 kw
New blades where heat threated to protect leading edge from erosion.

The rotor was fully equipped with new sealing strips. The grooves of the sealing strips were all damaged by erosion. As an alternative, energetic did not weld the entire rotor at the sealing places, but machined all grooves individually and (tailor made) new sealing strips for each individual position. By using this technology we not only save a large cost but also avoid extra heat input into the rotor and avoid the danger of cracking due to structural changes in the basic material of the rotor.

MAJOR OVERHAUL ABB VE 36 A  8640 kw - Hydrodynamic bearing repair
Hydrodynamic bearing repair

MAJOR OVERHAUL ABB VE 36 A  8640 kw
Replacement of new seal strips in the stationary blade carriers

MAJOR OVERHAUL ABB VE 36 A  8640 kw - High speed balancy of rotor
High speed balancing of the rotor according ISO normalisation including overspeed test.

After a down time of less than 8 weeks our engineers assisted the start up , especially support was provided because of the outdated control system. Another project where the customer has experienced the complete 360° service of Energetic

 

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