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X-DF Dual-Fuel Design
Proven and reliable clean-fuel technology from the dual-fuel pioneers
WinGD is a pioneer in modern dual-fuel technology for two-stroke marine engines, with LNG-fuelled engines in operation since 2016.
The well-established X-DF engines series offers a range of benefits over other dual-fuel engine concepts. Already matured into its second generation,?X-DF2.0 technologies?iCER and VCR offer a viable and proven step today towards meeting the long-term climate ambitions of ship owners, regulators and society.?
As shipping looks to new carbon-neutral and zero-carbon fuels, WinGD has expanded its X-DF portfolio to include ammonia and methanol engines, blending the proven dual-fuel expertise with the Diesel Cycle performance and reliability of WinGD’s X-Engines.?
X-DF for LNG
Using WinGD’s dual-fuel X-DF engines gives operators flexibility in reducing emissions.
Fossil LNG offers an immediate 15-20% reduction in greenhouse gas emissions. By blending or replacing fossil LNG with carbon-neutral synthetic or bio-LNG, operators can reduce their emissions further without modification.
The low-cost, highly efficient and reliable fuel injection concept used by WinGD’s dual-fuel LNG engines offers several advantages over other dual-fuel engine concepts:
- Simple installation, low-cost auxiliary systems and low power consumption contribute to lower investment and life cycle costs
- Extremely small pilot fuel quantity, below 1% of total heat release
- Engines can be operated on gas down to very low loads
- Low NOx emissions, close to zero SOx emissions and IMO Tier III compliance without exhaust-gas after-treatment
- Particulate matter emissions significantly reduced.
X-DF-A for ammonia
Available for order now, X-DF-A engines enable deep-sea ship owners and operators to harness carbon-free ammonia in their main engines, powering the transition to sustainable shipping.
Safety has been a key priority during the development of engines using ammonia due to the inherent characteristics of the fuel. Supported with Approvals-in-Principle from multiple class societies, X-DF-A delivers the assurance that ship owners and operators need to integrate ammonia-fuelled engines into vessel designs today.
The high-pressure injection concept deployed in X-DF-A engines will be familiar to operators of the WinGD well-established, highly efficient diesel-fuelled X-Engines. Notable features include comparable performance with X-Engines in both ammonia mode and diesel mode, low pilot fuel requirements precisely controlled through common rail injection and NOx Tier III compliance in both modes with Selective Catalytic Reduction (SCR).
Already traded globally as a fertiliser feedstock, refrigerant and industrial chemical, ammonia is set to become a mainstream energy carrier and fuel in the coming decades. Greenhouse gas emissions associated with its production and distribution can be nearly eliminated with the use of renewable electricity, making green ammonia a viable option for meeting societal and corporate climate goals – at the same time minimising owner and charterer exposure to forthcoming carbon pricing.
X-DF-P for LPG and ammonia
Available for order now for first engine deliveries from end of 2027, X-DF-P engines enable LPG and ammonia carrier owners and operators to integrate LPG-fuelled main engines into vessel designs today – with a clear pathway to ammonia when fuel availability allows.
The dual-fuel injection concept will be familiar to operators of WinGD’s efficient diesel-fuelled X-Engines. The engine operates on the diesel cycle in both LPG and diesel modes, with low pilot fuel consumption precisely controlled via common rail injection.
Sharing design principles with WinGD’s ammonia-fuelled engines, X-DF-P enables simple conversion to X-DF-A with minimal changes—supporting flexible, future-ready propulsion. Safety has been a key focus throughout the development process, ensuring confidence in handling both LPG and ammonia fuels.
X-DF-P engines are IMO Tier II NOx compliant in both modes without aftertreatment, and Tier III compliant with selective catalytic reduction. On-engine (iSCR) and off-engine SCR options are available depending on the engine configuration.
X-DF-M for methanol
Available for order now, X-DF-M engines enable deep-sea ship owners and operators to harness near carbon-neutral renewable methanol, powering the transition to sustainable shipping.
The high-pressure injection concept deployed will be familiar to operators of WinGD’s well-established, highly efficient diesel-fuelled X-Engines. Notable features include comparable performance with X-Engines in both methanol and diesel modes, low pilot fuel requirements precisely controlled through common rail injection, and NOx Tier III compliance in both modes with selective catalytic reduction.
Methanol is already a widely traded chemical with established port infrastructure, and is easy to handle onboard as it does not require compression or refrigeration and is liquid under ambient conditions. Production capability for low-carbon and renewable methanol is being rapidly scaled up to meet the needs of industrial users, making methanol a viable option for meeting societal and corporate climate goals – at the same time minimising owner and charterer exposure to forthcoming carbon pricing.?
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Press release
WinGD secures ammonia engine orders for Trafigura newbuilds
WinGD is to deliver X-DF-A ammonia-fuelled engine designs for four newbuild medium gas carriers (MGC).
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Incorporating state-of-the-art simulations to prepare crew to operate WinGD engines safely, efficiently and reliably.