Siemens Energy SGT-600 Industrial Gas Turbine

Overview

The Siemens Energy SGT-600 is a twin-shaft industrial gas turbine rated at 24.5 MW(e) for power generation, with a mechanical drive rating of 25.2 MW. Siemens Energy combines a robust industrial design with high fuel flexibility, third-generation Dry Low Emissions (DLE) combustion and a maintenance concept aimed at high availability and low operating cost. The Siemens Energy SGT-600 technical data poster lists a gross efficiency of 33.6 %, a heat rate of 10 720 kJ/kWh, a turbine speed of 7 700 rpm and an exhaust temperature of 543 °C, and states that the turbine is capable of burning up to 75 % hydrogen by volume in natural gas. Siemens Energy reports more than 363 units sold with over 13 million operating hours, and a fleet leader with 180 000 hours.

Seven Star LLC supplies Siemens Energy SGT-600 related equipment, instrumentation, auxiliary components and spare parts to operators in the Sultanate of Oman and the GCC, with engineering support in Muscat. We support oil and gas producers, industrial power plants and utilities by sourcing the items they specify, confirming part numbers and coordinating delivery to sites across Oman.

Operating Principle of the Siemens Energy SGT-600

As general engineering background, a twin-shaft gas turbine separates the gas generator, which compresses air, burns fuel and drives its own compressor, from a free power turbine that delivers useful work to a generator or driven machine. This allows the output shaft speed to change independently of the gas generator, a key advantage for compressor and pump drives, while the same core can also drive a generator through a gearbox.

Siemens Energy describes the Siemens Energy SGT-600 core engine as having a 10-stage transonic axial compressor with variable guide vanes for robust operability across a wide range of conditions, and a two-stage uncooled free power turbine with interlocking blade shrouds that provides a nominal shaft speed of up to 7 700 rpm. For mechanical drive, the power turbine can operate at 50 to 105 % of nominal speed. The pressure ratio is 14.0:1 and the exhaust mass flow 81.3 kg/s, and the high exhaust temperature makes the turbine well suited to heat recovery.

Engineering Design of the Siemens Energy SGT-600

The third-generation dual-fuel DLE combustion system of the Siemens Energy SGT-600 uses the same burners for gas and liquid operation and can change fuel on load in either direction. Siemens Energy states that the combustor and burner design can achieve NOx emissions of 9 ppmvd or less on gas, that low emissions are also reached on liquid fuel without water injection, and that the required gas supply pressure at site is relatively low at 24.5 bar(a). Fuel flexibility extends to gases with high inert, hydrogen and heavy hydrocarbon content within the published limits.

The Siemens Energy SGT-600 package has a compact, modular design with single-lift capability, and the same driver is used for power generation and mechanical drive. Package scope includes the gas turbine, enclosure, base frame, air intake, exhaust, lubrication, starter system, vibration monitoring, fire-fighting, ventilation, instrumentation, gas detection, fuel systems and a gearbox where needed. For service, Siemens Energy quotes 34 000 equivalent operating hours between hot section inspections, on-site maintenance or gas generator exchange within 24 hours, externally accessible burners, split casings and borescope access to the compressor, with only 14 scheduled maintenance days over a 17-year service cycle.

Key Features of the Siemens Energy SGT-600

The published characteristics of the Siemens Energy SGT-600 include:

• Power generation output of 24.5 MW(e) and mechanical drive output of 25.2 MW at ISO conditions.
• Gross efficiency of 33.6 % and heat rate of 10 720 kJ/kWh in simple cycle power generation.
• Twin-shaft design with free power turbine operating from 50 to 105 % speed for mechanical drive.
• Third-generation dual-fuel DLE combustion with on-load fuel changeover.
• NOx capability of 9 ppmvd or less on gas, with low emissions on liquid fuel without water injection.
• Capability to burn up to 75 vol% hydrogen in natural gas, according to the data poster.
• 34 000 equivalent operating hours between hot section inspections and gas generator swap within 24 hours.
• Compact single-lift package for simple cycle, combined cycle, cogeneration and drive applications.

Industrial Applications

Siemens Energy positions the Siemens Energy SGT-600 for industrial power generation in combined heat and power and combined cycle plants, for onshore oil and gas power generation and for mechanical drive, with packages designed to withstand climates from desert heat to arctic cold. In a 2×1 combined cycle configuration the manufacturer quotes a plant output of 74.2 MW(e) at 51.6 % net efficiency. In Oman and the GCC these capabilities match gas compression and power generation at oil and gas fields, cogeneration for refineries and petrochemical plants, and captive power for industrial users in Sohar, Duqm and Salalah.

As general guidance for operators planning spares, the most useful information to collect before an enquiry is the package serial number, the engine configuration (power generation or mechanical drive), the fuel system type, the control system generation and the original equipment part numbers shown on parts lists or nameplates. With this data, auxiliary items such as filters, sensors, valves, cables and monitoring modules can be matched reliably, and long-lead items can be identified early enough to fit planned inspection windows rather than forcing unplanned downtime.

Seven Star LLC supports Siemens Energy SGT-600 operators with machinery protection and instrumentation such as the Bently Nevada 3500/42M Proximitor seismic monitor, and we also assist users of other Siemens Energy turbines, including the SGT-800 industrial gas turbine and the SGT-300 industrial gas turbine. Send us the part numbers you need and our team will check availability.

Technical Specifications

The following ISO performance data is taken from the manufacturer technical data poster (natural gas, standard design):

How to Order

Send Seven Star LLC the unit serial number, package configuration and the part numbers or descriptions you require for your Siemens Energy SGT-600, or the outline of a new requirement. Our team in Muscat will review it, confirm what can be supplied and issue a formal quotation for delivery in Oman and the GCC. The manufacturer technical data poster is available for download on this page.