Wärtsilä Generating Sets

A wide range of generating sets, comprising generator and diesel engine mounted on a common baseframe, are available for both service power generation and for diesel-electric propulsion.

All generating sets listed are based on medium-speed diesel engines designed for operating on heavy fuel oil.

The generating sets are resiliently mounted and the generator voltage can be selected in all cases except for the Auxpac generating sets, which are Low Voltage only.

Larger diesel generators are delivered for separate mounting of the diesel engine and generator.

    20DF Genset
    Wärtsilä 20DF generating set IMO Tier III
    Cylinder bore 200 mm Generator voltage 0.4 - 13.8 kV
    Piston stroke 280 mm Generator efficiency 0.95 - 0.96
    Cylinder output 160, 185 kW/cyl Fuel specification: Fuel oil
    Speed 1000, 1200 rpm 700 cSt/50°C 7200 sR1/100°C
    Mean effective pressure 22.0, 21.0 bar ISO 8217, category ISO-F-DMX, DMA & DMB
    Piston speed 9.3, 11.2 m/s BSEC 8390 kJ/kWh at ISO cond.
    BSGC 8220 kJ/kWh at ISO cond.
    20DF, Rated power
    60 Hz 50 Hz
    Engine type 185 kW/cyl, 1200 rpm 160 kW/cyl, 1000 rpm
    Eng. kW Gen. kW Eng. kW Gen. kW
    6L20DF 1110 1065 960 920
    8L20DF 1480 1420 1280 1230
    9L20DF 1665 1600 1440 1380

    Genset-20DF
    Dimensions (mm) and weights (tonnes)
    Engine type A* E* I* K L* Weight*
    6L20DF 5325 2070 895 1800 2731 16.7
    975
    1025
    8L20DF 6030 2070 1025 1800 2791 20.8
    1075
    9L20DF 6535 2300 1075 1800 2831 23.7
    1125
    * Dependent on generator type and size. 
    31DF Genset
    Wärtsilä 31DF generating set
     IMO Tier III
    Cylinder bore 310 mm Fuel specification: Fuel Oil
    Piston stroke 430 mm 700 cSt/50°C  7200 sR1/100°C
    Cylinder output 530, 550 kW/cyl ISO 8217, category ISO-F-RMK 700
    Speed 720, 750 rpm
    Mean effective pressure 27.1, 27.2 bar BSEC 7220 kJ/kWh at ISO conditions
    BSGC 7105 kJ/kWh at ISO conditions
    Piston speed 10.3, 10.75 m/s
     Generator voltage  0.4-13,8 kV  
     Generator efficiency  0.95-0.97  
     31DF, Rated power
    Engine type
    60 Hz 50 Hz
    530 kW/cyl, 720 rpm 550 kW7cyl, 750 rpm
    Eng. kW Gen. kW Eng. kW Gen. kW
    8V31DF 4 240 4 070 4 400 4 225
    10V31DF 5 300 5 090 5 500 5 280
    12V31DF 6 360 6 100 6 600 6 335
    14V31DF 7 420 7 120 7 700 7 390
    16V31DF 8 480 8 140 8 800 8 450
    Wärtsilä 31 Genset dimensions
    31 DF genset, dimensions (mm) and weights (tonnes)
    Engine type A* E* I*  K*  L* Weight 
    8V31DF 9 100 3 110 1 700 2 390 4 880 90
    10V31DF 9 750 3 110 1 700 2 390 4 880 101
    12V31DF 10 150 3 500 1 700 2 390 4 350 115
    14V31DF 10 800 3 500 1 700 2 390 4 350 120,5
    16V31DF 11 400 3 500  1 700 2 390 4 350 131
    34DF Genset
    Wärtsilä 34DF generating set IMO Tier III, EPA T3
    Cylinder bore 340 mm Generator voltage 0.4 - 13.8 kV
    Piston stroke 400 mm Generator efficiency 0.95 - 0.97
    Cylinder output 480, 500 kW/cyl Fuel specification: Fuel oil
    Speed 720, 750 rpm 700 cSt/50°C 7200 sR1/100°C
    Mean effective pressure 22.0, bar ISO 8217, category ISO-F-DMX, DMA & DMB
    Piston speed 9.6, 10.0 m/s BSEC 7590 kJ/kWh at ISO cond.
    BSGC 7490 kJ/kWh at ISO cond.
    34DF, Rated power
    60 Hz 50 Hz
    Engine type 480 kW/cyl, 720 rpm 500 kW/cyl, 750 rpm
    Eng. kW Gen. kW Eng. kW Gen. kW
    6L34DF 2880 2770 3000 2890
    8L34DF 3840 3490 4000 3840
    9L34DF 4320 4150 4500 4320
    12V34DF 5760 5530 6000 5770
    16V34DF 7680 7370 8000 7680

    Genset-34DF
    34DF, Dimensions (mm) and weights (tonnes)
    Engine type A* E* I* K L* Weight*
    6L34DF 8765 2290 1450 2345 4000 60
    8L34DF 10410 2690 1630 2345 4010 76
    9L34DF 10610 2890 1630 2345 4180 87
    12V34DF 10260 3060 1900 2120 4335 99
    16V34DF 11465 3360 1850 2120 4445 124
    * Dependent on generator type and size.
    Generator output based on a generator efficiency of 96%.
    20 Genset
    Wärtsilä 20 generating set
    IMO Tier II or III
    Cylinder bore 200 mm Generator voltage 0.4 - 13.8 kV
    Piston stroke 280 mm Generator efficiency 0.95 - 0.96
    Cylinder output 185, 200 kW/cyl Fuel specification Fuel oil
    Speed 900, 1000rpm 700 cSt/50°C 7200 sR1/100°C
    Mean effective pressure 27.3, 28.0bar ISO 8217, category ISO-F-RMK 700
    Piston speed 8.4, 9.3m/s SFOC 190,3 g/kWh at ISO condition
    Genset 20, Rated power
    60 Hz 50 Hz
    Engine type 185 kW/cyl, 900 rpm 200 kW/cyl, 1000 rpm
    Eng. kW Gen. kW Eng. kW Gen. kW
    4L20 740 700 800 760
    6L20 1110 1055 1200 1140
    8L20 1480 1405 1600 1520
    9L20 1665 1580 1800 1710
    20-genset-dimensions
    Genset 20, Dimensions (mm) and weights (tonnes)
    Engine type A* E* I* K L* Weight*
    4L20 4910 1770
    1920
    990 1800 2338 14.0
    6L20 5325 1770
    1920
    2070
    895
    975
    1025
    1800 2243
    2323
    2373
    16.8
    8L20 6030 1920
    2070
    1025
    1075
    1800 2474
    2524
    20.7
    9L20 6535 2070
    2300
    1075
    1125
    1800 2524
    2574
    23.8
    * Dependent on generator type and size.
    26 Genset
    Wärtsilä 26 generating set IMO Tier II or III
    Cylinder bore 260 mm Generator voltage 0.4 - 13.8 kV
    Piston stroke 320 mm Generator efficiency 0.95 - 0.96
    Cylinder output 325, 340 kW/cyl Fuel specification: Fuel oil
    Speed 900, 1000rpm 700 cSt/50°C 7200 sR1/100°C
    Mean effective pressure 23.0, 25.5 bar ISO 8217, category ISO-F-RMK 700
    Piston speed 9.6, 10.7m/s SFOC 185,8 g/kWh at ISO condition
    Genset 26, Rated power
    60 Hz 50 Hz
    Engine type 325 kW/cyl, 900 rpm 340 kW/cyl, 1000 rpm
    Eng. kW Gen. kW Eng. kW Gen. kW
    6L26 1 950 1 870 2 040 1 960
    8L26 2 600 2 495 2 720 2 610
    9L26 2 925 2 810 3 060 2 940
    12V26 3 900 3 745 4 080 3 915
    16V26 5 200 4 990 5 440 5 220

    Genset 20
    Genset 26, Dimensions (mm) and weights (tonnes)
    Engine type A* E* I* K L* Weight*
    6L26 7 500 2 300 1 200 2 430 3 033 35
    8L26 8 000 2 300 1 200 2 430 3 068 45
    9L26 8 500 2 300 1 300 2 430 3 168 50
    12V26 8 400 2 700 1 560 2 765 3 686 60
    16V26 9 700 2 700 1 560 2 765 3 716 70
    * Dependent on generator type and size.
    31 Genset
    Wärtsilä Genset 31 IMO Tier II or III
    Cylinder bore 310 mm Generator voltage 0.4–13.8 kV
    Piston stroke 430 mm Generator efficiency 0.95–0.97
    Cylinder output 590, 610 kW/cyl Fuel specification: Fuel oil
    Speed 720, 750 rpm 700 cSt/50⁰C 7200 sR1/100⁰F
    Mean effective pressure 30.3, 30.1 bar ISO 8217, category ISO-F-RMK 700
    Piston speed 10.3, 10.75 m/s SFOC 169,6 g/kWh at ISO conditions
    Genset 31, Rated power
    Engine type 60 Hz 50 Hz
    590 kW/cyl, 720 rpm 610 kW/cyl, 750 rpm
    Eng. kW Gen. kW Eng. kW Gen. kW
    8V31 4 720 4 530 4 880 4 685
    10V31 5 900 5 665 6 100 5 855
    12V31 7 080 6 800 7 320 7 030
    14V31 8 260 7 930 8 540 8 200
    16V31 9 440 9 060 9 760 9 370
    Wärtsilä 31 Genset dimensions
    Genset 31, Dimensions (mm) and weights (tonnes)
    Engine type A* E* I* K L* Weight*
    8V31 9 100 3 110 1 700 2 390 4 880 90.0
    10V31 9 750 3 110 1 700 2 390 4 880 101.0
    12V31 10 150 3 500 1 700 2 390 4 350 115.0
    14V31 10 800 3 500 1 700 2 390 4 350 120.5
    16V31 11 400 3 500 1 700 2 390 4 350 131.0
    *Dependent on generator type and size.
    32 Genset
    Wärtsilä 32 generating set IMO Tier II or III
    Cylinder bore 320 mm Generator voltage 0.4 - 13.8 kV
    Piston stroke 400 mm Generator efficiency 0.95 - 0.97
    Cylinder output 480, 500 kW/cyl Fuel specification: Fuel oil
    Speed 720, 750 rpm 700 cSt/50°C 7200 sR1/100°C
    Mean effective pressure 24.9, 25.9 bar ISO 8217, category ISO-F-RMK 700
    Piston speed 9.6, 10.0 m/s SFOC 174 g/kWh at ISO condition
    Genset 32, Rated power
    Engine type 60Hz/720rpm 50 Hz/750 rpm
    560 kW/cyl 580 kW/cyl
    Engine kW Gen. kW Engine kW Gen. kW
    6L32 3 360 3 230 3 480 3 340
    8L32 4 480 4 300 4 640 4 450
    9L32 5 040 4 840 5 220 5 010
    12V32 6 720 6 450 6 960 6 680
    16V32 8 960 8 600 9 280 8 910
    20-genset-dimensions
    Genset 32, Dimensions (mm) and weights (tonnes)
    Engine type A* E* I* K L* Weight*
    6L32 8 505  2 490  1 450  2 345 3 745 57
    8L32 10 410  2 690  1 630  2 345 4 010 76
    9L32 10 505  2 890  1 630  2 345 4 010 86
    12V32 10 700  3 060  1 700  2 120 4 130 100
    16V32 11 465  3 360  1 850  2 120 4 445 127
    * Dependent on generator type and size.
    38 Genset
    Wärtsilä 38 generating set IMO Tier II
    Cylinder bore 380 mm Generator voltage 0.4 - 13.8 kV
    Piston stroke 475 mm Generator efficiency 0.96 - 0.98
    Cylinder output 725 kW/cyl Fuel specification: Fuel oil
    Speed 600 rpm 700 cSt/50oC 7200 sR1/100oC
    Mean effective pressure 26.9 bar ISO 8217, category ISO-F-RMK 700
    Piston speed 9.5 m/s SFOC 182,0 g/kWh at ISO cond.
    Genset 38, Rated power
    Engine type 50 Hz, 60 Hz 
    Eng.kW Gen.kW
    6L38 4 350 4 200
    8L38 5 800 5 600
    9L38 6 525 6 300
    12V38 8 700 8 400
    16V38 11 600 11 200
    38 genset
    Genset 38, Dimensions (mm) and weights (tonnes)
    Engine type A* E* I* K L* Weight*
    6L38 9 600 2 900 1 655 3 135 4 485 90
    8L38 12 000 2 900 1 705 3 135 4 475 110
    9L38 12 300 3 100 1 805 3 135 4 575 130
    12V38 11 900 3 600 2 015 2 855 4 945 160
    16V38 13 300 3 800 2 015 2 855 5 120 200
    * Dependent on generator type and size.
      Marine specific information

      Generating set dimensions

      A - Total length of the generating set.
      E - Total width of the generating set.
      I - Distance from the bottom of the common baseframe to the crankshaft centreline.
      K - Minimum height from the crankshaft centreline when removing a piston.
      L - Total height of the generating set.

      Dimensions and weights

      • Dimensions are in millimetres and weights are in metric tonnes.
      • Indicated values are for guidance only and are not binding.
      • Cylinder configurations: L = in-line and V = v-form.

      Specific fuel energy consumption

      • At ISO standard reference conditions at 85% load
      • Lower calorific value of fuel 42 700 kJ/kg
      • Tolerance 5%
      • With engine driven pumps
      • Natural gas
      • Methane number min. 80
      • Lower heating value min. 28 MJ/Nm3
      • Gas pressure 5.5 bar

      ISO standard reference conditions

      Total barometric pressure: 1.0 bar
      Suction air temperature: 25 °C
      Charge air, or scavenge air, cooling water temperature: 25 °C
      Relative humidity: 30%

      Methane Number

      Wärtsilä Methane Number Calculator

      We have developed this tool for ship owners and operators to calculate the Methane Number of the fuel gas.
      The calculation result indicates whether or not the given gas quality is suitable for use in Wärtsilä dual-fuel engines.

      Methane CH4
      mol%
      EthaneC2H6
      mol%
      PropaneC3H8
      mol%
      Iso-butane (2-Methylpropane)i-C4H10
      mol%
      N-butanen-C4H10
      mol%
      Iso-pentane (2-Methylbutane)i-C5H12
      mol%
      N-pentanen-C5H12
      mol%
      EthyleneC2H4
      mol%
      PropyleneC3H6
      mol%
      Neo-pentane (2,2-Dimethylpropane) neo-C5H12
      mol%
      Mix-hexaneMix C6H14
      mol%
      Mix-heptaneMix C7H16
      mol%
      N-Octanen-C8H18
      mol%
      Carbondioxide C02
      mol%
      CarbonmonoxideC0
      mol%
      HydrogenH2
      mol%
      Nitrogen N2
      mol%
      Hydrogen sulfideH2S
      mol%
      Total mol%
      Wärtsilä Methane number (WMN)
      Propane Knock Index (PKI)
      The calculation tool is owned by Wärtsilä and is made for customer use and is for guidance only. Changes in the tool is reserved at any time.

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