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REPORT ON THE FIRST OPERATIONAL EXPERIENCE OF THE NEWLY COMMERCIALIZED 29MW SGT-700 (GT10C) GAS TURBINE Georg Nordén, Development Manager, SGT-700, Siemens Industrial Turbomachinery AB 0. Abstract During the past year Siemens’ recently launched 29MW SGT-700 gas turbine has been proven in commercial operation and is showing great progress as a new product. The turbine is in commercial operation in a number of different applications at three site locations and a fourth site is in the rotating commissioning phase. Applications cover mechanical drive, power generation, offshore and onshore, and the turbines operate on both single and dual fuel. In total, seven units have been delivered of which six are in commercial operation. The first 25 000 hours of erection, commissioning and commercial operation have passed without major findings for our customers. Operation has been affected only by minor outages. Actions have been performed with a speedy and effective response to cause minimum disturbance to the customer. 1. Market Introduction The product release has moved on to an intensive phase to meet the market demands for reliable and mature design. The past years of extensive validation of the product have proven to be a good investment. The concept is based on the two-shaft unit but with third-generation DLE (Dry Low Emissions) combustion technology. The robust design from the SGT-600 (which has accumulated over three million operation hours) is utilized to maintain high availability and reliability and has been an excellent platform for the SGT-700 introduction. In November 2001 the first engine was started and passed through the first part of the validation process. Complete disassembly and visual inspection of each component were standard procedure during this first year to validate the design. Clearance and dimensional checks were performed to verify the design. During disassembly/assembly our tools and working routines were also validated. We also took the opportunity to improve the maintenance routines and to highlight important assembly steps. Focus during the past year has changed from an intensive quality assurance of the internal engineering to an external focus on the customer and his application, concentrating mainly on raising availability and reliability. The introduction program has shown the importance of being on site close to the customer to give support and listen to his voice. The units (gas generator with power turbine) are standby and have been updated with the latest design features. Fast response has been essential in order to meet availability /reliability requirements even in an emergency situation. None has been used in commercial operation. Main activities have been • Resident engineering support on site and reporting a trained eye’s observation -0- © Siemens AG 2006. All rights reserved. • Inspections at intervals of 2500 operating hours. Currently three inspections have been performed (2x2500, 5000 hrs). • Continuous updating of back-up plans such as preventive, operational and emergency spares. • Review of feedback from sites and identification of potential improvements for other sites • FMEA – (Failure Mode and Effect Analysis) has been used for judging new and potential findings that affect our customer Our Condition Monitoring System (CMS) has been an important tool for the engineering team to investigate root causes on reported findings from site. The system permits on-line evaluation direct from site. 2. Design features • SGT-700 has an increased airflow (from 80 to 91 kg/s compared to the SGT-600, by extending the compressor blading profile and introducing one additional compressor stage). • A different combustion system has been introduced (same as the 45 MW SGT-800), which represents the third generation of DLE demonstrating 15ppm NOx on gaseous fuel and 42 ppm NOx on liquid fuel without any introduction of water or steam. • The turbine inlet temperature (TIT) has increased by a moderate 27°C (from 1115° to 1142°C, mixture temperature according to ISO). The compressor turbine has a modified cooling design in order to handle the increased TIT. • The pressure ratio has been increased from 14 to 18. • The power turbine has been designed for a lower speed (from 7700 rpm to 6500) in order to better fit the mechanical drive market. Since speed was reduced and output increased, the turbine now has a larger diameter. • The efficiency has increased from 34 to 37%. © Siemens AG 2006. All rights reserved. -1- Improved blade profiles Improved design Bolted power turbine in the compressor of CT blade cooling on a bi

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