Our customer-owned Combined-Cycle Power Plant is a 775 MW gas-fired power plant in Turkey. In 2021, our customer acquired the power plant and a number of other assets. They soon got the plant up and running again, but there was a problem. The plant’s two GE Frame 9FA gas turbines were suffering from combustion chamber issues. These would cause the engine to trip, which in turn led to the unit having unplanned outages.
Under previous ownership, the power plant’s two gas turbines had been modified – but not by the original equipment manufacturer. Because the modifications had been carried out by a third party, the OEM wouldn’t support inspection or maintenance of the gas turbines. What the OEM was prepared to do, however, was replace the modified combustion chamber sections and some turbine parts but at a cost of some $20 million. Per unit.
The location in Turkey sees significant fluctuations in temperature. Over the summer months, you can expect temperatures in the region of 30°C (86°F), while winter temperatures can drop to as low as -3°C (26.6°F). And during the day, temperatures can go from 10°C to below zero. This causes unit instability.