Reduce your carbon footprint with the new MAN L21/31DF-M methanol GenSet
The maritime industry is decarbonizing and methanol is currently one of the leading fuels among the alternative fuel solutions. Following the market demand and rising interest, we hereby introduce the new MAN L21/31DF-M methanol GenSet - the first small-bore dual-fuel methanol GenSet in our portfolio.
MAN Energy Solutions in Frederikshavn, Denmark is home of the MAN L21/31DF-M, our first small-bore GenSet fueled by methanol.
Proven GenSet design
The foundation of this new engine is based on the current L21/31 GenSet and its well-proven technology, which has already accumulated more than 110 million operating hours, with thousands of engines in service.
Key benefits
Perfect design features for efficient and reliable operation
The L21/31DF-M comes with a cost-optimised, low-flashpoint fuel supply system which makes it a competitive solution.
Furthermore, the port fuel injection (PFI) concept provides additional simplicity and an attractive capital outlay. And it is based on proven components.
Long time between overhaul intervals will save you time and costs on engine maintenance and will give you additional flexibility for the planning of your maintenance slots.
![L2131_Engine_Front MAN L21/31 engine rendering](/images/default-source/marine-images/l2131_engine_front.jpg?sfvrsn=9dcab8b8_4)
Technical specifications
Description | Main data |
Bore | 210 mm |
Stroke | 310 mm |
Speed | 900 / 1,000 rpm (60 Hz / 50 Hz) |
Output | 1,000 – 1,980 kW |
Cylinder configurator | 5 – 6 – 7 – 8 – 9 |
Available fuels | HFO, MDO, MGO, LSFO, ULSFO, Biofuels, MeOH |
Emission limit | IMO Tier III with SCR after-treatment |
Optimized port fuel injection
The port fuel injection (PFI) system uses a methanol injection nozzle installed outside the combustion chamber. This simplified design removes the risk of blocked nozzles in diesel mode and reduces investment costs thanks to its easy installation and integration with standardized components.
MAN SaCoS control system and cybersecurity
![L2131-SaCoSone L2131-SaCoSone](/images/default-source/marine-images/l2131-sacosone.jpg?sfvrsn=3ffa9ec2_0)
The safety and control system MAN SaCoS supports a fast and reliable data-transfer between the engine and the power management system in the control room by easy cable connection.
The engine control system is attached to the engine and features an intuitive user interface and a colour display in different languages. The electric speed governor enables fast response
Perfect match for MAN B&W ME-LGIM two-stroke methanol engine
![L2131-LGIM L2131-LGIM](/images/default-source/marine-images/l2131-lgim.jpg?sfvrsn=73a0b869_0)
The first MAN B&W ME-LGIM came into service in 2016. Since then, we have accumulated more than half a million running hours on methanol alone, which provides a solid base for new developments. The L21/31DF-M is a perfect match for this methanol-fueled propulsion engine.
Low-pressure fuel supply system
The methanol supply system for L27/38DF-M is a cost-optimised low-pressure system, effectively making it a profitable solution providing a lower capex.
Increased fuel flexibility
The possibility to operate engines on methanol as a drop-in fuel means that e-methanol and bio-methanol increase the fuel flexibility of the new engine and the potential of methanol as an option for GenSet applications on large merchant marine vessels as well as for propulsion solutions for smaller vessel types.
Engine control system: SaCoS
The safety and control system MAN SaCoS supports a fast and reliable data-transfer between the engine and the power management system in the control room by easy cable connection.
The engine control system is attached to the engine and features an intuitive user interface and a colour display in different languages. The electric speed governor enables fast response
What makes the new methanol-fueled MAN L21/31DF-M GenSet special? Watch our 3D engine animation to find out more about the working principles, and also the Port Fuel Injection system.
Service solutions for your equipment
MAN PrimeServ offers a range of modernization solutions for optimizing the reliability, availability, and economic efficiency. MAN’s upgrade and retrofit solutions are tailor-made to customers’ specific applications and equipment.
![MAN-PrimeServ MAN-PrimeServ](/images/default-source/marine-images/man-primeserv.jpg?sfvrsn=7c05099d_0)
Are you ready for green methanol?
Newbuild or retrofit? What are the costs? What are the benefits? Take the lead in sustainable shipping by contacting us today!
Continue reading
Inside the making of a methanol GenSet
Related products
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Alternative fuels
Operate your in service engines with Alternative Fuels: Unleash Carbon-Free & Carbon-Neutral Solutions for MAN, B&W and S.E.M.T. Pielstick engines. Achieve Fuel Flexibility for Existing Systems!
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MAN B&W ME-LGIM
The MAN B&W ME-LGIM is a two-stroke, dual fuel engine that runs on both methanol and conventional fuels.
Related News
MAN 21/31 Mk2 PLO GenSets for Antarctica Cruise Ship
Chilean shipbuilder, ASENAV (Astilleros y Servicios Navales S.A.), has ordered 4 × MAN 6L21/31 Mk2 PLO (Part-Load Optimised) GenSets for a 94-metre, passenger cruise-ship newbuilding for Antarctica21, the world’s leading provider of air-cruises. The ‘Magellan Discoverer’ will be slightly larger than a similar ship in the Antarctica21 fleet, the ‘Magellan Explorer’ from 2019, which has the same engine type installed and can also boast of a PC6 polar-ice classification.
ASENAV is the largest private shipyard on the Pacific and Caribbean coasts, adding significant value when promoting MAN engines aboard notable vessels all across America.
Each GenSet will come integrated with MAN Energy Solutions’ proprietary LP-SCR (Low-Pressure Selective Catalytic Reduction) system that delivers NOx-reduction rates of up to 90% in fulfilling the latest IMO environmental requirements. The engines will be built at MAN Energy Solutions’ facility in Aurangabad, India where a very compact RAMME PM (Permanent Magnet) alternator will also be integrated.
Jaime Vásquez, President of Antarctica21, stated: “We are delighted to reaffirm our partnership with MAN Energy Solutions Chile by selecting the 21/31 Mk2 PLO engine for our new polar vessel. This engine sets the standard for the lowest fuel consumption in its category. Our continued trust in MAN Energy Solutions after-sales service in Chile, renowned for its reliability and expertise, reinforces our decision.”
Gerardo Schneeberger – Head of Sales, Chile – MAN Energy Solutions, said: “We are very proud of this repeat order by Antarctica21 at ASENAV for MAN 21/31 engines. This displays great trust in MAN technology and further cements the solid foothold that our small-bore, four-stroke, medium-sized engines have established in the Chilean market. The unique capabilities offered by PrimeServ Chile’s 24/7 service within all Chilean territories have also been key to winning this order.”
Christian Kamm – Sales Manager Europe, Marine – MAN Augsburg, said: “The optimised MAN 21/31 Mk2 PLO GenSet improves fuel efficiency without additional costs and combines classic engine-design principles with innovative technology. The integrated SCR system will also ensure the protection of the pristine marine environments that this cruise ship will operate in.”
MAN 21/31 engine
The MAN 21/31 Mk2 PLO engine maintains a significantly reduced fuel-consumption (up to 9 g/kWh@75% MCR) with the longest times between overhaul in its class. It also comes equipped with MAN’s modern Safety and Control System (SaCoSone). Furthermore, the Mk2 engine is capable of burning conventional fuels like HFO/LSFO, MDO and MGO, complying with new ISO 8217:2024 fuels, as well as sustainable fuels like biodiesel FAME and HVO-100.
The 21/31 Mk2 PLO engine is designed as ‘methanol-ready’ with ‘Approval in Principle’ from the DNV classification society for retrofit to methanol operation as a green fuel at a later date, should it be required.
Originally designed in 2000/2001 with the goal of providing a compact and robust engine, the 21/31 engine is characterised by its easy installation and maintenance. To date, between ordered and delivered engines, the 21/31 has accumulated sales of some 2,750 units.
The MK2 PLO GenSet was introduced to the market in spring 2023 and has already made some 30 sales, especially within the offshore wind and cargo/passenger ferry segments.
About Antarctica21
Antarctica21 specialises in fly-and-sail expeditions to the White Continent. The company was founded in 2003 by adventurers who believed there was a better way to travel to the Antarctic Peninsula. Before Antarctica21, travellers who wanted to reach the Peninsula had only one option: a two-day cruise across the notoriously rough seas of the Drake Passage. Since then, however, the company’s boutique expeditions have offered a more comfortable alternative. A two-hour flight takes guests from Punta Arenas, Chile, directly to King George Island, where they then board their expedition ship. No stormy crossing. No seasickness. Just quick, total immersion in the Antarctic experience. The company’s ships accommodate a maximum of 76 guests, offering flexibility and access that larger vessels can’t match. Guests embark and disembark efficiently, so time ashore is focused on savouring every moment of a travel experience unlike any other.
Documents
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PR 21.31 Antarctica21 cruise_EN
Contact
Nils Søholt
Trade Press Marine
Group Communications & MarktingMAN Energy SolutionsTeglholmsgade 412450 Copenhagen SVDenmark
nils.soeholt@man-es.com t +45 33 85 26 69Available languages
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- EN
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Set course to net zero with methanol GenSets - MAN L21/31DF-M
Watch the recording of our MAN ExpertTalk, where we introduced our new engine type: the small-bore four-stroke MAN L21/31DF-M GenSet for methanol operation.
You can look forward to hearing
about this new GenSet type, the Port Fuel Injection (PFI) concept, the fuel gas supply system and the possibility to operate these GenSets on green methanol and biofuel oils.