SGT-A35

With class-leading reliability and availability, the SGT-A35 is your proven, dependable choice in power generation and mechanical drive applications. It is qualified to meet the stringent standards of the oil and gas industry and has earned a solid reputation in both onshore and offshore service.

The SGT-A35 fleet has matured over 46 million hours in service. This gas turbine variant is the latest evolution in a portfolio continuously improved over 40 years of technology development. Utilizing components already proven in industrial, marine and aerospace service, the SGT-A35 offers class-leading power density for power generation and mechanical drive applications. The efficient SGT-A35 gas turbine is integrated in a compact, lightweight and highly maintainable package designed for oil and gas applications.

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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.

Ingenious design to the core

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.

SGT-A35 package: optimized for offshore

The lightweight SGT-A35 gas turbine is integrated into the compact package, proven in offshore oil and gas applications.
The result is a product that offers you a minimal footprint and the highest power density in its class to maximize production while reducing topside weight; therefore lowering upfront capital investment and increasing long-term value creation.
All this while preserving the reliability of designs proven in service and compliant to the requirements of offshore oil and gas applications, including floating production, storage and offloading (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.

High fuel flexibility for a broad application range

The SGT-A35 is a dual-fuel gas turbine, capable of operating on gaseous and liquid fuels and enabling an automatic changeover between these two fuels while running as required.
A broad variety of gaseous and liquid fuels can be utilized. In particular, the SGT-A35 has been tested with an extended range of gaseous fuel compositions with high proportions of inert gases, as found in several applications such as deep sea offshore. Through a dedicated engine test program, the SGT-A35 has demonstrated operation with gaseous fuels containing as much as 50% inert gas by volume. Equipped with WLE burners, the engine is capable to burn up to 100 vol% of hydrogen (H2). With DLE burners, the hydrogen capability is up to 15 vol%.
A Dry Low Emission (DLE) option is available for all variants of the SGT-A35.

	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	30.8 MW(e)	31.2 MW(e)	32.7 MW(e)	37.2 MW(e)	33.5 MW(e)	31.7 MW(e)	33.9 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	37.7%	38.0%	39.0%	40.4%	39.3%	37.8%	38.0%
Heat rate	9,552 kJ/kWh (9,054 Btu/kWh)	9,486 kj/kWh (8,991 Btu/kWh)	9,224 kJ/kWh (8,743 Btu/kWh)	8,910 kJ/kWh (8,445 Btu/kWh)	9,154 kJ/kWh (8,676 Btu/kWh)	9,536 kJ/kWh (9,038 Btu/kWh)	9,465 kJ/kWh (8,971 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

	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	32.2 MW	32.5 MW	38.5 MW	34.7 MW	33.9 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	39.3%	39.6%	41.9%	40.7%	40.4%
Heat rate	9,158 kJ/kWh (8,680 Btu/kWh)	9,095 kJ/kWh (8,620 Btu/kWh)	8,601 kJ/kWh (8,152 Btu/kWh)	8,836 kJ/kWh	8,904 kJ/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

Customer: Petrobras
Scope: 32 × SGT-A35 (Industrial RB211-GT62) generating sets
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.

	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

	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)

SGT-A35 gas turbine

Trusted power, everywhere

Learn more about class-leading flexibilty for the challenges of tomorrow

Highlights of the SGT-A35 gas turbine

Ingenious design to the core

Well proven in all environments

Robust and seaworthy

SGT-A35 package

SGT-A35 package: optimized for offshore

Comprehensive services to support you

Global presence to support you

Designed for maintenance and availability

High fuel flexibility for a broad application range

DLE option available

Technical data for the SGT-A35

Performance data for simple cycle power generation

Performance data for combined cycle power generation

Performance data for mechanical drive

Physical dimensions and weight

The SGT-A35 is suitable for the following applications and industries:

Find out more about our gas turbine offerings

Brochures

Gas turbine portfolio (interactive PDF)

SGT-A35 Class-leading flexibility for the challenges of tomorrow

Articles and papers

Smaller and stronger

Experience the SGT-A35 (Industrial RB211) in commercial operation, worldwide

SGT-A35 gas turbine

Trusted power, everywhere

Learn more about class-leading flexibilty for the challenges of tomorrow

Flexible application match

Vast experience, trusted performance

No “hot lock-out” periods

Evolved from proven components

Combining the best in the industry for oil and gas