The SGT-A35 offers top reliability and availability for power generation and mechanical drive applications in the oil and gas industry. With a solid reputation in onshore and offshore service, this gas turbine has accumulated over 46 million hours in operation. It is the latest evolution in a technology portfolio refined over 40 years, utilizing proven components from industrial, marine, and aerospace service. The SGT-A35 provides class-leading power density in a compact, lightweight, and easily maintainable package designed specifically for oil and gas applications.
The SGT-A35 portfolio includes 2 variants of gas generators and 3 variants of free power turbines, allowing multiple combinations with power output ranging between 32 and 38 MW in mechanical drive, and different drive-shaft speed. Each variant is available with or without Dry Low Emissions (DLE) combustion and can be configured for electrical generation or mechanical drive, onshore or offshore. Such a diverse portfolio ensures that the gas turbine can be ideally matched to your requirements of each application.
The SGT-A35 has earned the trust of operators in a large spectrum of applications, in the power industry as well as in oil and gas. The SGT-A35 legacy spans over 40 years of continuous improvement through the incremental injection of aero engine technology. Over 850 SGT-A35 units have been sold to date, accumulating a service experience of over 46 million operating hours. The SGT-A35 is regarded as a class leader for reliability.
All variants of the SGT-A35 can be restarted at any time following a shutdown from any condition, without any delay due to "hot lockout" conditions. Unlike some of its competitors, the SGT-A35 can achieve this reliably by inherent design. Thanks to its agile twin-spool architecture, the SGT-A35 provides the most robust solution to restoring power quickly when its availability is most critical.
The SGT-A35 is the latest evolution in the portfolio, introducing a synchronous speed variant to the existing highspeed power turbine coupled to the prove gas generator to allow direct drive or geared drive of an electrical generator.
The SGT-A35 can also be utilized in mechanical drive applications, making it one of the most flexible gas turbines in its range. Its performance is optimized for hot climates, delivering significantly more power at 30 °C than its predecessors.
The SGT-A35 brings to oil and gas operators the trusted technologies acquired by Siemens Energy aeroderivative gas turbine portfolio. The reliable SGT-A35 gas turbines, with over 800 units supporting oil and gas operations worldwide, are now packaged with the oil and gas expertise of Siemens Energy, which has supplied over 1,000 units to the oil and gas industry over the years. The SGT-A35 package leverages the best designs and know-how of two trusted names in the oil and gas industry to produce superior customer value.
Methanol-Powered SGT-A35 Turbine Test Hailed as 'Key Milestone' for Greener North Sea
A decades-old offshore gas turbine can be retrofitted to run on methanol, cutting emissions by 80%.
The SGT-A35 uses an aeroderivative, 2-spool gas generator aerodynamically coupled to a free power turbine. Two variants of gas generators and two variants of power turbines are available to perfectly match your requirements in each application. The 2-spool architecture allows maximum operational flexibility, resulting in a gas turbine with high tolerance to transient excursions and challenging mission cycles, fast starting and with no "hot lockouts". All variants can operate on gaseous and liquid fuel, and can be configured with an optional Dry Low Emission (DLE) combustor.
Well proven in all environments
The SGT-A35 is the result of over 40 years of technological innovation. Utilizing aero engine technology with millions of operating hours accumulated in flight, the SGT-A35 has built a vast experience base of their own with over 46 million hours operating in power generation and mechanical drive service, onshore and offshore and in the most challenging environments.
Robust and seaworthy
SGT-A35 gas turbines are already well proven in offshore applications, with over 15 million operating hours accumulated in fixed and floating offshore installations.
SGT-A35 package
Fit-for-purpose packaging features, and configurable options have been demonstrated across various oil and gas applications. Choices in mechanical systems, instrumentation, electrical devices, and materials cater to a range of international and API standards, environmental conditions, facility cooling schemes, and availability requirements.
SGT-A35 package: optimized for offshore
The SGT-A35 gas turbine is integrated into a compact package, proven in offshore oil and gas applications, offering a minimal footprint and the highest power density in its class. This maximizes production, reduces topside weight, lowers upfront capital investment, and increases long-term value creation. The design is reliable and compliant with the requirements of offshore oil and gas applications, including FPSO vessels.
Comprehensive services to support you
Our comprehensive portfolio of services provides low life cycle cost and optimum performance throughout the turbine’s life cycle: Long Term Programs (LTP), overhaul service, field service, spare parts, service exchange, remote diagnostic service, and modernization and upgrades. Whether for scheduled service or short-term support, our specialists are there for you, on-site all over the world. Maintenance of the SGT-A35 engine can be accomplished quickly and easily due to the aero engine design.
Global presence to support you
We can offer a truly global service presence. This includes an integrated offering of repair, service and maintenance, 24/7 remote monitoring and diagnostics, and customer technical training solutions to ensure high availability and optimum performance of equipment throughout the engine's lifecycle.
Designed for maintenance and availability
Over its 40-year legacy, the SGT-A35 has been continuously improved for ease of maintenance, to maximize availability and reduce OPEX. The lightweight aeroderivative gas generator can be safely exchanged on-site within 24 hours, reducing maintenance downtime and cost.
High fuel flexibility for a broad application range
The SGT-A35 is a dual-fuel gas turbine capable of automatic changeover between gaseous and liquid fuels. It has been tested with a broad variety of gaseous and liquid fuels, including high proportions of inert gases found in deep sea offshore applications. The engine can burn up to 100% hydrogen with WLE burners and up to 15% hydrogen with DLE burners. A Dry Low Emission (DLE) option is available for all SGT-A35 variants.
DLE option available
SGT-A35 are available with a Dry Low Emission (DLE) option, to achieve emission levels of 25 vppm (dry at 15% O₂) for NOₓ and CO.
Technical data for the SGT-A35
Simple cycle power generation
Combined cycle power generation
Mechanical drive
Physical dimensions
Performance data for simple cycle power generation
SGT-A35 (GT62) DLE
SGT-A35 (GT62)
SGT-A35 (GT61 34 MW) DLE
SGT-A35 (GT61 39 MW)
SGT-A35 (GT61 34 MW)
SGT-A35 (GT61 34 MW) Direct Drive DLE 60 Hz
SGT-A35 (GT61 34 MW) Direct Drive 60 Hz
Power output
31.8 MW(e)
32.1 MW(e)
33.7 MW(e)
38.1 MW(e)
34.5 MW(e)
32.2 MW(e)
34.5 MW(e)
Fuel*
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Frequency
50/60 Hz
50/60 Hz
50/60 Hz
50/60 Hz
50/60 Hz
60 Hz
60 Hz
Gross efficiency
37.8%
38.0%
39.1%
40.5%
39.4%
37.8%
38.0%
Heat rate
9,535 kJ/kWh (9,037 Btu/kWh)
9,473 kj/kWh (8,979 Btu/kWh)
9,199 kJ/kWh (8,719 Btu/kWh)
8,881 kJ/kWh (8,418 Btu/kWh)
9,137 kJ/kWh (8,660 Btu/kWh)
9,529 kJ/kWh (9,031 Btu/kWh)
9,476 kJ/kWh (8,981 Btu/kWh)
Turbine speed
4,800 rpm
4800rpm
4,850 rpm
4,850 rpm
4,850 rpm
3,600 rpm
3,600 rpm
Pressure ratio
22.0 : 1
22.6 : 1
22.4 : 1
24.5 : 1
23.0 : 1
22.3 : 1
23.6 : 1
Exhaust mass flow
97.7 kg/s (215.6 lb/s)
98.6 kg/s (216.9 lb/s)
97.8 kg/s (215.6 lb/s)
105.4 kg/s (232.4 lb/s)
99.2 kg/s (218.2 lb/s)
98.1 kg/s (216.3 lb/s)
101.0 kg/s (222.7 lb/s)
Exhaust temperature
487 °C (905 °F)
483 °C (901 °F)
487 °C (909 °F)
484°C (903 °F)
486 °C (907 °F)
494 °C (921 °F)
506 °C (943 °F)
NOₓ emissions**
15 – 25 ppmvd
15 – 25 ppmvd
≤ 25 ppmvd
All performance values are nominal gross, based on standard design, ISO ambient conditions and high-methane natural gas fuel. No intake or exhaust loss. | *Other fuels on request. Automatic changeover from primary to secondary fuel at any load | **NOₓ emissions at 15% O₂ on fuel gas (with DLE)
Performance data for combined cycle power generation
SGT-A35 (GT62) DLE
SGT-A35 (GT61 34MW) DLE
Net power output
39.8 MW(e)
42.6 MW(e)
Net plant efficiency
51.4%
52.8%
Net heat rate
7,005 kJ/kWh (6,639 Btu/kWh)
6,820 kJ/kWh (6,464 Btu/kWh)
Pressure/ Reheat
Dual/ No
Dual/ No
All performance values are based on standard design, ISO ambient conditions and high-methane natural gas fuel. No intake or exhaust loss. All combined cycle performance is based on 2 pressure, no reheat.
Performance data for mechanical drive
SGT-A35 (GT62) DLE
SGT-A35 (GT62)
SGT-A35 (GT61 39 MW)
SGT-A35 (GT61 34 MW)
SGT-A35 (GT61 34 MW) DLE
Power output
33.1 MW
33.5 MW
39.5 MW
35.8 MW
34.9 MW
Fuel*
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Natural gas, liquid fuel, dual fuel
Efficiency
39.4%
39.6%
42.0%
40.8%
40.5%
Heat rate
9,142 kJ/kWh (8,665 Btu/kWh)
9,083 kJ/kWh (8,609 Btu/kWh)
8,572 kJ/kWh (8,125 Btu/kWh)
8,820 kJ/kWh
(8,360 Btu/kWh)
8,880 kJ/kWh
(8,417 Btu/kWh)
Drive shaft speed
3,120 – 4,800 – 5,040 rpm
3,120 – 4,800 – 5,040 rpm
3,153 – 4,850 – 5,093 rpm
3,153 – 4,850 – 5,093 rpm**
3,153 – 4,850 – 5,093 rpm**
Pressure ratio
22.1 : 1
22.6 : 1
24.6 : 1
23.0 : 1
22.4 : 1
Exhaust mass flow
97.7 kg/s
98.6 kg/s (217.4 Ib/s)
105.4 kg/s (232.4 lb/s)
99.2 kg/s
97.8 kg/s
Exhaust temperature
485 °C (905 °F)
481 °C (898 °F)
484 °C (903 °F)
486 °C (907 °F)
487 °C (909 °F)
NOₓ emissions**
15 - 25 ppmvd
15 - 25 ppmvd
**high speed variant
**high speed variant
All performance values are nominal at power turbine shaft, based on standard design, ISO ambient conditions and high-methane natural gas fuel. No intake or exhaust loss. | *Other fuels on request. Automatic changeover from primary to secondary fuel at any load | **NOₓ emissions at 15% O₂ on fuel gas (with DLE)
Physical dimensions and weight
Power generation package (direct drive)
Mechanical drive package
Approx. weight
165,700 kg (364,500 lb)
72,500 kg (159,500 lb)
Length
18.9 m (62 ft)
9.0 m (29.5 ft)
Width
3.4 m (11 ft)
3.4 m (11 ft)
Height
4.5 m (15 ft)
4.5 m (15 ft)
Weight is for the installed unit, dry, excluding free-standing modules and filter house support structure. Dimensions are for the main package enclosure. For power generation, the AC generator is included.
The SGT-A35 is suitable for the following applications and industries:
Find out more about our gas turbine offerings
In our download section, you can find brochures, technical papers, and more. Or you can contact us directly for specific inquiries.
This project taps the large deep water pre-salt oil and gas reserves of Brazil. The largest single order for the SGT-A35 (Industrial RB211) to date adds to a large fleet already operating off the shore of Brazil, in fixed and floating applications. As part of this contract, a new package assembly facility was built in Brazil, providing local jobs, solid partnerships and investment in development and training.
West-East Gas Pipeline, China (2015)
Customer: PetroChina
Scope: 3 phases for a total of 30 × SGT-A35 (Industrial RB211) gas turbines driving centrifugal pipeline compressors
Part of the West-East Pipeline Project (WEPP) which transfers gas imports from Turkmenistan to China
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