Wärtsilä 34SG-LPG gas engine

The Wärtsilä 34SG-LPG is a four-stroke, spark-ignited, lean-burn gas engine generating set. It has been specifically designed to operate on propane gas fuel and provides an excellent fit for flexible baseload and industrial applications.

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Wärtsilä 34SG-LPG engine generating set

Wärtsilä 34SG-LPG is based on proven Wärtsilä 34SG technology designed for natural gas operation, with more than 1300 units having been delivered during the past 20 years. The Wärtsilä 34SG-LPG features a wide power output range from 4.2 to 7.4 MW, as it is available in 12V, 16V and 20V cylinder configurations. Wärtsilä engine power plants can be delivered both as EPC and Equipment Delivery contracts.


Key benefits of the Wärtsilä 34SG-LPG gas engine

  • Runs on both propane and natural gas
  • Has the flexibility to run on natural gas if it is available, and can switch fuels while operating
  • Outstanding simple cycle efficiency with propane fuel
  • Turbocharged gas engine technology offers the highest possible simple cycle efficiency
  • High operational flexibility including fast starting and loading capabilities 

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The details

Technical data

Engine generating set
Cylinder configurations12, 16, 20V
Cylinder bore340 mm
Piston stroke400 mm
Engine speed750 rpm (50 Hz), 720 rpm (60 Hz)
Performance *
Rated electrical power (kW)7 346 (50Hz) 7 041 (60Hz)5 873 (50Hz) 5 618 (60Hz)4 380 (50Hz) 4 185 (60Hz)
Electrical efficiency (%)45.8 (50Hz) 45.7 (60Hz)45.8 (50Hz) 45.6 (60Hz)45.5 (50Hz) 45.3 (60Hz)
Heat rate (kJ/kWh)7 862 (50Hz) 7 875 (60Hz)7 867 (50Hz) 7 899 (60Hz)7 906 (50Hz) 7 944 (60Hz)
Loading and unloading
 Connected to gridFull load
Regular start time (min:sec)00:30< 5
Stop time (min)1
Ramp rate (hot, load/min)> 100%
Minimun Load
Unit level10%
Plant level1%
* Rated electrical power and electrical efficiencies are given at generator terminals at 100kPa ambient pressure, 25°C suction air temperature and 30% relative humidity, and without engine driven pumps. Power factor 1.0 (site). Electrical efficiency with 5% tolerance. Site conditions, fuel and applicable emission limits may have an impact on performance figures. Please contact Wärtsilä for project-specific performance data. Emission figures for LBF must be evaluated case by case. Catalyst systems are designed based on project specific requirements. Certain fuel components are poisonous for catalyst elements. Maximum amount of these components to be limited in the fuel in applications where catalyst system is installed.
Disclaimer: The information contained herein is provided for informational purposes only and may not be incorporated, in whole or in part, into any agreement or proposal. No representation of any kind is made in respect of any information contained herein and Wärtsilä expressly disclaims any responsibility for, and does not guarantee, the correctness or the completeness of the information. The calculations and assumptions included in the information do not necessarily take into account all the factors that could be relevant in a particular case. Information herein shall not be construed as a guarantee or warranty of the performance of any Wärtsilä technology, equipment or installation.

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Build your own power plant







> 500MW

Liquid fuels

Natural gas

Liquid fuels and gas

Flexible baseload (>6000 running hours annually)

Intermediate load (2000 - 6000 running hours annually)

Peaking and grid stability (<2000 running hours annually)


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