• Sustainable, reliable power for a greener future

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Dual fuel serves a dual purpose 

The concept of dual-fuel engines was designed to satisfy market demands to utilize excess natural gas as a supplemental fuel. Now, there’s a growing need for engines that use natural gas to reduce environmental impact alongside the economic benefits. 

When you choose an MAN dual-fuel engine, you choose a power solution that meets or exceeds the strict requirements that vessels operate under when sailing in environmentally sensitive regions. Every step we take to make our engines more efficient can have a measurable effect on both environment and your bottom line.

Dual-Fuel
16000
small-bore GenSets by MAN Energy Solutions are in service today
36000
h
Time between overhaul (TBO) extends up to 36,000 hours. For a positive effect on your fleet expenditure

Introducing the new MAN L23/30DF and L28/32DF

Our marine systems expertise is focused on emission reduction, complete propulsion packages, electrical propulsion, dual-fuel, LNG, and digitalized services. Meeting the challenge of more eco-friendly energy systems, without compromising on their reliability and cost-effectiveness, requires a new way of thinking. 

MAN has risen to the occasion with proven two-stroke main engines and four-stroke GenSet engines: The dual fuel MAN L23/30DF is based on the popular and robust MAN L23/30H GenSet, and is available for new buildings as well as an economical retrofit solution.

The MAN L28/32DF engine is based on the proven MAN L28/32H, recognized worldwide as an ultra-reliable and robust GenSet with long TBOs. Its ability to run on gas offers economical and environmental advantages, especially as part of a complete power package.

tanker

Benefits at a glance:

  • IMO Tier III-compliant in gas mode
  • High efficiency in gas and diesel mode
  • Easy operation, easy maintenance and proven reliability
  • Long time between overhauls with low life cycle costs

Retrofitting: the economical option

With the popularity of the MAN L23/30H and L28/32H GenSets, it’s natural that both engines come as a retrofit option. Update your vessels with dual fuel, spending minimal time in drydock, and return them to peak operating performance, and peak earning potential quickly.

Go to MAN PrimeServ

Cut down emissions in four strokes 

At a glance

Exceptional in every way: The new MAN L23/30DF and L28/32DF

 

Built on the legendary reliability and availability of their predecessors the robust cast-iron monoblock engine design stays the same with the dual-fuel models. Maintenance is simple, spare parts are easy to obtain, and time between overhaul (TBO) extend up to 36,000 hours.

MAN2832DF

MAN L23/30DF

MAN L23/30DF technical data 

MAN L23/30DF

Dimensions

 Cyl. No 5  7  
   720/750  720/750  900  720/750  900  720/750  900  r/min
 A  3,469  3,839  3,839  4,209  4,276  4,579  4,896  mm
 B  2,202  2,252  2,252  2,302  2,302  2,352  2,352  mm
 C  5,671  6,091  6,091  6,511  6,578  6,931  7,241  mm
 H  2,749  2,749  2,749  2,749  2,749  2,749  2,749  mm
 Dry mass  17,3  19,0  19,2  21,4  21,4  23,3  23,4  t

 

Output

Speed 750  750  720  720  900 900  r/min 
 Frequency  50  50  60  60  60  60  Hz
   Eng. kW   Gen. kW*  Eng. kW  Gen. kW*  Eng. kW Gen. kW*  
 MAN 5L23/30DF  625  590  625  590  -  -  kW
 MAN 6L23/30DF  750  710  750  710  900  855  kW
 MAN 7L23/30DF  875  830  875  830  1,050  995  kW
 MAN 8L23/30DF  1,000  950  1,000  950  1,200  1,140  kW

 

* Base on nominal generator effiencies of 95%. Gas methane number ≥80.

 

General 

Compliance with emission regulations 

  • Engine cycle: four-stroke 
  • No. of cylinders: 5 – 8     
  • Bore: 225 mm     
  • Stroke: 300 mm

 

Power range and output (MCR)

  • Power range: 625 – 1,200 kW
  • 720/750 rpm: 125 kW per cylinder
  • 900 rpm: 150 kW per cylinder
  • Gas mode: 110% MCR
  • Fuel mode: 110% MCR

720/750 rpm

  • Gas mode: IMO Tier III
  • Fuel mode: IMO Tier II

900* rpm

  • Gas mode: IMO Tier II 
  • Fuel mode: IMO Tier II

    * For 900 rpm IMO Tier III compliance in Q2, 2019

MAN L28/32DF

MAN L28/32DF technical data 

MAN-28_32DF

 

Dimensions

Cyl. No.   5  6  7  
   720/750  720/750  720/750  720/750  720/750 r/min 
 A  4,321  4,801  5,281  5,761  6,241  mm
 B  2,400  2,510  2,680  2,770  2,690  mm
 C  6,721  7,311  7,961  8,531  8,931  mm
 H  2,835  3,009  3,009  3,009  3,009  mm
 Dry mass  32,6  36,3  39,4  40,7  47,1  t

 

Output

Speed  750  750 720  720  r/min
Frequency  50  50  60  60  Hz
   Eng. kW  Gen. kW*  Eng. kW  Gen. kW*  
MAN 5L28/32DF  1,000  950  1,000  950  kW
MAN 6L28/32DF  1,200  1,140  1,200  1,140  kW
MAN 7L28/32DF  1,400  1,330  1,400  1,330  kW
MAN 8L28/32DF  1,600  1,520  1,600  1,520  kW
MAN 9L28/32DF  1,800  1,710  1,800  1,710  kW

* Based on nominal generator efficiencies of 95%. Gas methane number ≥ 80.

 

General

  • Engine cycle: four-stroke
  • No. of cylinders: 5 - 9
  • Bore: 288 mm
  • Stroke 300 mm

 

 

Power range and power output (MCR)

  • Power range: 1,000 - 1,800 kW
  • 720/750 rmp: 200 kW per cylinder
  • Gas mode: 110% MCR
  • Fuel mode: 110% MCR

Compliance with emisssion regulations 

 

720/750 rpm

  • Gas mode: IMO Tier III
  • Fuel mode: Imo Tier II
 

 

 

24
h
service with passion across the globe with MAN PrimeServ
365
days
a year technical support, consulting and OEM spares,as well as maintenance, repair and comprehensive individualized service plans

Empowering a greener future – together

There are many ways in which the MAN L23/30DF and L28/32DF can support you and your business.

Contact us today and meet one of our dedicated experts.

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