Mid year of 2007 Siemens Oil & Gas and Industrial Applications introduced an enhanced SGT-800 gas turbine. The new power rating is 47MW at a 37.5% electrical efficiency in open cycle (ISO). Four components in the gas turbine are modified and are fully interchangeable between the existing 45MW and the 47MW rating. Improved cooling designs were introduced in the turbine stages #1 and #2 requiring no change to the casting design. The only modification is to the machining of the parts and to the guide vane cooling inserts and impingement screens. A re-stagger of the stage #1 compressor blade was made to give a slightly increase in the airflow. The combustor outlet temperature (COT) remains the same. The first SGT-800 with 47MW rating was successfully tested during the autumn of 2006 and the expected performance figures were confirmed. This unit has, up to November 2007, accumulated 8 000 hours and a planned follow up inspection made after 4 000 hours by borescope of the hot section showed that the parts were in excellent condition. This article presents some details of the design work carried out during the development of the enhancement from 45MW to the mature rating of 47MW and the operation experience from the first units.

The GTX100 is the most recent industrial gas turbine in the ABB fleet. The development of the GTX100 turbine blading was a joint project involving four companies. A thorough evaluation of various design requirements resulted in the selection of a single shaft three-stage turbine configuration. The cooling techniques employed for the blading are based on the knowledge from the Russian school of design for gas turbines. These techniques have been verified by a considerable amount of experimental data and field experience over a number of years. To incorporate western manufacturing methods, western suppliers were introduced at an early stage in the development. Most of the engineering development of the turbine blading was carried out in Russia. In order to achieve efficient cooperation between Russia and Sweden, specialists from both companies were stationed at alternating companies. The verification of the turbine design is divided into two steps. The first step is cold and hot component testing and the second is the overall engine testing.

ALSTOM Power has launched the GT10C a 30 MW industrial gas turbine (see figure 1) upgraded from the 25 MW GT10B. The thermal efficiency of the new gas turbine is 37.3% (shaft) and 36% electrical at ISO inlet conditions with no losses. The new GT10C has a Dry Low Emission (DLE) combustor for both natural gas and diesel oil fuel; it has NOx emissions at 15 ppmv on gas and 42 ppmv on oil fuel (15% O2 dry). The first GT10C is now manufactured and assembled, and has been under testing since October 2001. For this purpose a new test rig has been built in Finspong, Sweden, in order to verify performance and reliability. GT10C will be available to the market mid-2002 and manufactured in parallel with GT10B. The general design is based on the GT10B and measures have been taken for maximum reliability and maintenance in order to keep operation costs to a minimum. Improvements for GT10C are mainly derived from GT10B or taken from ALSTOM Power GTX100 (43 MW gas turbine), as described herein.