Maintenance & Overhaul for Industrial Steam Turbines

Siemens Energy Maintenance Services

Maintenance objectives & strategies

Like any machine, every steam turbine is subject to wear and aging processes. Thus, the aim of all maintenance is to determine and assess the condition of a machine through regular maintenance and repair measures and to avoid wear and aging processes which leads to failures.The figure shows that the initial state can be restored by regular maintenance. In addition, due to advanced technological / design improvements  can increase the design life expectancy above the initial condition.

Inspection & overhaul schedule

Through FlexLTP the turbine-opening at 50,000 equivalent operating hours (EOH) can be avoided since the turbine condition can be predicted via daily monitoring. This means no full overhaul within 100,000 EOH (up to 12 years). 

Inspection & overhaul scope


Monitoring and re-adjustment of   all functions of the monitoring,   safety and protection equipment. Opening of the turbine housing not necessary. 

Minor Overhaul

In addition to the inspection‘s scope   of work, during the minor overhaul   further testings but also necessary   replacements are executed. Opening of the turbine housing not necessary. 

Major Overhaul

Additional to the scope of inspection   and minor overhaul, during the   major overhaul the turbine is   examined in dismantled condition. Opening of the turbine housing necessary.


Approximately 18 months in advance, a meeting with a Siemens Energy service engineer is necessary to clarify the following scope of work under consideration of plant observations, operating behaviour and EOH:

  • Nature and extend of the overhaul
  • Available and required spare parts
  • Opportunities of upgrading
  • Time schedule and resources


By utilization of an optimized maintenance strategy the following benefits can be ensured:

  • Reduction of failure downtime
  • Prevention of forced outages
  • Optimization of operating costs
  • Extension of equipment failure
  • Enhanced availability and reliability
  • Highes profitability

Maintenance Services Solutions