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Greenhouse exhaust emissions a main concern for ships 

As ships carry passengers and cargo throughout the world, they produce exhaust emissions that have a damaging impact on fragile ecosystems. Finding ways to reduce emissions and make ships greener is an important factor for the future of the marine sector. 

Emission regulations becoming even tougher


The shipping industry is responsible for transporting over 95% of all goods traded around the world today. Many ships, like cruise liners and tugs, travel in environmentally sensitive areas. To do so, their engines need to meet very strict emission regulations. IMO Tier III, Emission Control Area (ECA) and Energy Efficiency Design Index (EEDI) regulations define the limits for all vessels sailing in international waters. The global response to the devastating effects of pollution and global warming on marine ecosystems is to adopt even tougher rules for emissions, as seen at the 2015 Paris Climate Conference (COP21).

Keeping hazardous greenhouse emissions to a minimum is a top priority. At the same time, it is also important to not sacrifice ship engine performance and propulsion efficiency. To ensure the future viability of their fleets, ship owners and operators need to do everything they can to minimize the carbon footprint of their vessels. They need to constantly reduce NOx and SOx emissions to stay ahead of ever stricter legislation as it emerges. This means finding and using alternative fuels while utilizing available technologies to operate the cleanest ships possible.




target global temperature limit increase set in Global Shipping’s Action Plan
in emission reductions possible through energy efficiency, according to the Int. Energy Agency (IEA)
reduction in NOx emissions possible with MAN SCR (Selective Catalytic Reduction)

MAN solutions to reduce emissions at sea

MAN Emission Control technologies reduce a ship's emissions through technologies to improve efficiency and utilize cleaner fuels. In this way, we help ships meet all current and future regulations while ensuring a lower impact on the environment.

We offer our Emission Control technologies as part of MAN ECO CONTROL, a portfolio of technologies that will help optimize ship performance in terms of emissions, economy and operation. Ship operators benefit from smart processes, efficient operation and predictive maintenance services.


Battery-hybrid solutions


MAN Energy Solutions offers marine battery-hybrid systems, which combine combustion engines with additional batteries to capture and store electric power, optimizing engine operation while reducing emissions. We acquired a 40 percent stake in Aspin Kemp & Associates (AKA), a specialist in the integration of electric propulsion and energy storage systems to enhance our expertise and range of products in this field.

We also offer fully customized hybrid propulsion systems in which mechanical and electric engines work together. These are ideal for vessels with flexible operation profiles and running hours with varying power demands. Our versatile MAN HyProp ECO package combines a CP propeller, diesel engine and electric shaft machine to ensure the highest efficiency and lowest emissions in all operating modes – optimized to meet your vessel’s specific needs.

How you benefit:

  • Fewer NOx, SOx and CO2 emissions
  • Zero emissions when just batteries are used (especially at slow speeds)
  • Increased fuel efficiency
  • Quieter operation
  • Batteries reduce transient loads, preventing black smoke during maneuvering
  • Wide range of operation modes
  • Improved performance

Dual Fuel & LNG Gas

Graphic DualFuel LNG Gas Supply

After our 2016 acquisition of Cryo AB, a manufacturer of cryogenic equipment with over 50 years’ experience in cleaner burning Liquefied Natural Gases (LNG), MAN Energy Solutions created the MAN Cryo product brand – the perfect complement to our dual fuel engines. We offer solutions for comprehensive engine and environmentally friendly fuel gas supply systems (FGSS), offshore and onshore bunkering systems, and stationary distribution systems for regasification or fuel filling – all from a single source.

We can tailor our dual fuel propulsion systems to meet every requirement: from LNG technology for dual fuel propulsion to complete LNG handling systems (including carriers, floating storage and regasification units, feeder and bunker vessels).

How you benefit:

  • Clean burning gas, fewer NOx emissions
  • Increased fuel efficiency
  • Lower operating costs
  • Dual fuel system means flexibility and fuel independence
  • One point of contact for all components, training and support

Exhaust Gas After Treatment

We offer proven exhaust gas after treatment systems that meet the International Maritime Organization’s strict regulations for NOx emissions and fuel sulfur content, even in Emission Control Areas (ECA). Selective catalytic reduction (SCR) and exhaust gas recirculation (EGR) are highly effective technologies to minimize harmful NOx emissions.

Our MAN SCR system is an integrated solution available in 14 different sizes for our entire range of four-stroke medium speed engines. It induces chemical reactions in engine exhaust gases to convert harmful substances into environmentally safe ones. We can also customize MAN SCR systems for new buildings and retrofits upon request.

How you benefit:

  • Reduce NOx emissions up to 90%
  • IMO Tier III compliance in ECA
  • Increased fuel efficiency
  • Increased power density
  • One source, one point of contact
  • Minimum costs, maximum flexibility


Service solutions for optimum cost-efficiency 

MAN PrimeServ offers advanced modernization solutions to optimize the reliability, availability, and economic efficiency of existing equipment. Furthermore, MAN’s modernization and retrofit solutions are tailor-made to customers’ specific applications and machinery.

To MAN PrimeServ

MAN PrimeServ
total plant efficiencies for Combined Heat & Power applications
installed capacity since 1985




World’s first container ship converted to dual fuel

Our Emission Control solutions are designed to meet a wide range of customer requirements and applications while improving their overall environmental impact.

Customer:Wessels Reederei GmbH & Co. KG

Retrofit container ship to dual fuel (LNG)

Location: Germany
Completion:August 2017
Commercial Operation:07 / 2015
MAN’s Work Scope:

MAN multi-fuel, four-stroke MAN 51/60DF engine, supplied all conversion components

Watch video on YouTube

Forward-looking Emission Control solutions ensure the viability and profitability of the marine industry

  • Reduced emissions for an improved greenhouse footprint, meeting all regulations
  • Technologies to use alternative and cleaner burning fuels (LNG)
  • Increase fuel efficiency for reduced costs
  • Improved engine performance and flexibility
Contact us


Related news

Tuesday, November 24, 2020

EGR Offered for Dual-Fuel ME-GA Engine

Well-proven Exhaust Gas Recirculation optimises ME-GA performance; reduces specific gas/fuel-oil consumptions by ~3% and 5% respectively

MAN Energy Solutions has announced that it is to offer its proprietary EGR (Exhaust Gas Recirculation) system as an emissions solution for its new, low-speed ME-GA engine, the Otto-cycle variant of its established ME-GI dual-fuel engine. EGR is a NOx-emissions-reduction technique that ensures IMO Tier III-compliance in both diesel and gas mode.

The company has long experience with the emission-reduction technology and reported the first order for an EGR system in 2011 when it was fully integrated within the MAN B&W 6S80ME-C9 main engine of a 4,500 teu containership newbuilding.

Thomas S. Hansen, Head of Promotion and Customer Support, MAN Energy Solutions, said: “Nine years have passed since our very first EGR system passed its Factory Acceptance Test, and the knowledge we have subsequently gained in the field has led to today’s fully-mature solution. Our EGR system not only achieves NOx-compliance, but also delivers a performance upgrade for both conventional and now ME-GA engines.”

MAN Energy Solutions reports that EGR will enable the ME-GA to reduce specific gas consumption by ~3%, and specific fuel-oil consumption by 5%. It will also significantly reduce methane slip by 30 to 50% and solve the issue related to pre-ignition on Otto-cycle engines.

Hansen continued: “With our hard-earned experience – added to the rigourous testing that all our EGR systems undergo – we are the de-facto market leader and play a vital role in decarbonising the maritime industry. Our robust EGR solutions fully integrate with other ship systems and are easily integrated with the ME-GA engine.”

MAN Energy Solutions states that it has received orders for over 241 engines with EGR, with more than 33 units already in service. The company expects to deliver the first, commercial ME-GA low-pressure dual-fuel engine by end-2021.

EGR solution

As previously stated, EGR will help reduce the ME-GA’s methane slip by 30 to 50%, while lowering specific gas consumption by around 3% and specific fuel-oil consumption in diesel mode by 5%. EGR will enable the ME-GA to meet Tier III requirements in both fuel oil and gas modes without additional aftertreatment.


MAN Energy Solutions plans to make the EGR option available from late 2021, concurrent with the introduction of the ME-GA. The company’s experience with designing and delivering low-pressure and high-pressure EGR versions has enabled it to bring the new solution to market in a relatively short time.

The ME-GA EGR solution is a high-pressure system, which can be integrated into existing engine-room designs, and the EGR unit itself does not change the engine footprint. Its design-similarity to that of ME-C engines’ EGR systems will lower its price point, since the supply chain and components are already matured.

The EGR system works through drawing around 30 to 50% of the engine’s exhaust gas into the EGR receiver, where it passes through a pre spray to lower its temperature, before passing through a cooler spray. After passing through a water-mist catcher, the gas then goes through a blower to increase pressure back up to scavenging air pressure, before being fed back into the compressor and the engine.

The volume requirements of the ME-GA EGR system are significantly lower with, for example, less pipework required than for low-pressure EGR solutions.

Introducing an EGR solution also improves the stability of the combustion process. MAN Energy Solutions is currently researching how far it can lower methane slip while maintaining a good equilibrium with recirculation.

About ME-GA

MAN Energy Solutions is developing the high efficiency, low-pressure, two-stroke, dual-fuel MAN B&W ME-GA engine at its Research Centre Copenhagen. The engine delivers a low CAPEX solution aimed at certain vessel types and applications – such as LNG carriers – that are able to use ‘boil-off’ gas as a source of fuel, or smaller ships where low capital outlay is a priority.

Based on the well-proven MAN B&W dual-fuel design with minimal installation requirements, the MAN B&W ME-GA uses an efficient ignition concept and unique gas-admission system that delivers safe and reliable operation.

The ME-GA furthermore features minimal operational costs, simple supply and purging concepts, and low maintenance costs for its fuel-gas supply system.


  • 20201124_MAN_ES_PR EGR ME-GA_EN
    PDF, 150 KB English
  • 20201124_MAN_ES_PR EGR ME-GA_DE
    PDF, 150 KB English



Nils Søholt

Trade Press Marine

Group Communications & MarktingMAN Energy SolutionsTeglholmsgade 412450 Copenhagen SVDenmark

t +45 33 85 26 69

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