Wärtsilä AmmoniaPac is a complete fuel supply system for ammonia-fuelled ships, designed to support the safe storage, processing and fuel supply of ammonia fuel onboard. It includes bunkering station skids, storage tanks, main process equipment, and control and monitoring systems that provide stable and reliable gas flow to the engines.
As part of the Wärtsilä ammonia-fuelled power solution, AmmoniaPac supports vessels using ammonia for propulsion and onboard power generation. The system also includes an integrated Ammonia Release Mitigation System, ARMS, to prevent ammonia release from the process system.
At a glance
What it is:
Wärtsilä AmmoniaPac is a complete ammonia fuel supply system for ships, covering bunkering, onboard storage, fuel processing, control and monitoring, and delivery of ammonia fuel to the engines.
Why it matters:
Ammonia has the potential to be CO2-free with produced using renewable energy and releases no sulphur or particulates when combusted.
How it works:
The system safely bunkers and stores liquid ammonia, processes it onboard, and provides stable and reliable gas flow to Wärtsilä ammonia engines. It uses automation, control and monitoring, and ARMS to support safe fuel handling.
Where it applies:
Wärtsilä AmmoniaPac is suitable for ammonia-fuelled vessels using ammonia for propulsion and power generation, including newbuild projects and retrofit projects subject to vessel-specific requirements and project evaluation.
Ammonia is becoming one of the marine fuel options ship owners and operators are evaluating as they plan how to reduce greenhouse gas emissions from future vessels and existing fleets.
For technical and sustainability teams, the question is not only whether ammonia can reduce emissions. It is how ammonia can be handled safely and reliably onboard. Wärtsilä AmmoniaPac is designed to address this fuel-handling challenge as part of the ammonia-fuelled vessel system. It combines storage, processing, automation, control and monitoring, and ammonia release mitigation to support controlled onboard operations.
Wärtsilä AmmoniaPac helps you move from general ammonia-fuel interest to a practical vessel concept by providing the fuel supply system needed to store, handle and deliver ammonia onboard. It is designed for ammonia-fuelled ships and supports both propulsion and onboard power generation applications.
The solution is tailored and vessel optimised to meet operational and regulatory needs, and it can be configured for semi refrigerated and fully refrigerated ammonia using Type-C single shell tanks, depending on the available ammonia and regulatory requirements.
When AmmoniaPac is delivered as part of the complete Wärtsilä ammonia solution, it is integrated with Wärtsilä ammonia engines, helping to maximise safety in the engine room and fuel handling spaces. For ship owners and technical teams, this means the fuel supply system can be evaluated as part of the wider vessel design, conversion scope and safety case instead of as an isolated component.
Wärtsilä AmmoniaPac manages the ammonia fuel pathway from bunkering to storage, processing and supply to the engines. The fully automated system includes bunkering station skids, storage tanks and main process equipment, supported by a control and monitoring system. This allows the liquid ammonia to be bunkered and stored safely, then supplied as a stable and reliable gas flow to the engines.
The system design is based on experience in developing Wärtsilä’s LNGPac solution, and it has been designed to comply with evolving class rules for ammonia. It is fully compatible with the Wärtsilä 25 ammonia engine and can adapt to future requirements on fuel supply.
The safety concept includes integrated automation, control and monitoring, and ARMS, which prevents ammonia release from the process system. In addition, the system is designed so that ammonia emissions from normal operations are eliminated.
Wärtsilä AmmoniaPac is suitable for:
Wärtsilä AmmoniaPac is delivered as a vessel-specific ammonia fuel supply system rather than as a generic standalone product. The system design can be tailored and optimised to meet the vessel’s operational and regulatory needs, including the selected ammonia storage arrangement, onboard location, tank configuration and fuel supply requirements.
In practice, the scope can include the bunkering station skids, storage tanks, main process equipment, control and monitoring system, and integrated ARMS. The system can be configured for refrigerated or fully pressurised ammonia and can support above-deck or below-deck locations, depending on the vessel design and project requirements.
For projects where boil-off gas management is an important consideration, a subcooler unit can be included. This way, there is unlimited holding time and worry-free tank BOG management.
For ammonia-fuelled vessel projects, delivery and implementation should also be considered as part of the wider safety and integration work. Wärtsilä can offer a complete ammonia solution, developed with a holistic approach involving customers, classification societies and flag states.
If you are evaluating ammonia fuel supply for a vessel project, it helps to see where the technology is already being applied and how Wärtsilä is supporting ammonia-fuelled vessel development.
The transition to ammonia as a marine fuel is being shaped by new vessel projects, technology milestones and industry collaboration. Explore Wärtsilä announcements related to ammonia-powered vessels, fuel supply systems and maritime decarbonisation initiatives.
Whether you are exploring ammonia as a future fuel option, assessing safety implications, or building a business case for vessel decarbonisation, these resources can help you deepen your understanding of ammonia-powered shipping.
Ammonia as marine fuel? Benefits, challenges, and smart adoption: Explore key aspects of ammonia as a marine fuel, including its potential role in shipping decarbonisation.
Expert advice: how to deal safely with ammonia on board ships: Learn more about the practical considerations of handling ammonia onboard and the measures needed to support safe vessel operations.
Excited about ammonia as marine fuel? 6 things you need to know: Get an introduction to some of the topics commonly discussed when evaluating ammonia as a marine fuel option.
Future fuels A to Z: Explore a range of fuel and energy pathways that are being considered as part of shipping's transition toward lower-emission operations.
The safe and reliable use of ammonia onboard depends on more than fuel choice. Contact Wärtsilä to discuss how AmmoniaPac could support your newbuild or retrofit project as part of an ammonia-fuelled vessel concept.
The contents of this page have been written with the help of AI. A Wärtsilä expert has checked and verified these contents.