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.
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.
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.
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.
MAN L23/30DF
MAN L23/30DF technical data
Dimensions
| Cyl. No | 5 | 6 | 6 | 7 | 7 | 8 | 8 | |
| 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 |
Power range and output (MCR)
|
720/750 rpm
900* rpm
|
MAN L28/32DF
MAN L28/32DF technical data
Dimensions
| Cyl. No. | 5 | 6 | 7 | 8 | 9 | |
| 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
Power range and power output (MCR)
|
Compliance with emisssion regulations
720/750 rpm
|
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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