Industrial Service Solutions

The Wabtec 250MDC Marine Series is designed to meet US EPA Tier 4 and IMO III emissions requirements without using urea-based SCR aftertreatment.

Instead, the engine uses advanced exhaust gas recirculation, known as EGR, to reduce emissions without the need for urea storage, dosing equipment or SCR system complexity. For marine operators, this can simplify vessel integration, reduce system weight and remove the health and safety burden of handling urea on board.

Selective Catalytic Reduction (SCR) is a technology used to reduce emissions in diesel engines by injecting urea into the exhaust system. It is commonly used to meet emissions regulations but adds complexity to system design and operation.

For operators looking to avoid urea handling, the Wabtec 250MDC Marine Series is a strong option. It delivers medium-speed diesel performance with Tier 4 and IMO III compliance without urea-based SCR.

This makes it especially suitable for vessels where space, weight, payload capacity and operational simplicity are important.

“No urea” means the engine does not require a urea-based selective catalytic reduction system to meet emissions requirements. This can simplify site operation, reduce consumable handling, lower HSE risk and remove the need for urea storage, dosing and associated logistics.

For marine applications, avoiding urea systems can also reduce system weight and free up valuable space. For stationary power sites, it can simplify site layout and reduce ongoing operational complexity.

A marine engine without SCR can offer several practical benefits. It can reduce system weight, remove urea handling, simplify installation and free up space that would otherwise be used for aftertreatment equipment.

For vessel operators and shipbuilders, this can make the overall propulsion or auxiliary power system easier to design, easier to maintain and easier to operate.

Medium-speed diesel engines are commonly used in marine power applications because they are designed for demanding duty cycles, long running hours and stable performance.

For vessels requiring propulsion or auxiliary power, a medium-speed engine can offer a strong balance of durability, efficiency and reliability.

Removing urea systems can free up space and reduce weight on board the vessel.

In some marine applications, this may allow more usable space for cargo, equipment, operational systems or other vessel priorities. It can also make vessel integration simpler by reducing the number of emissions-related components that need to be installed and maintained.

A no-urea marine diesel engine can reduce system complexity, lower HSE risk, save space, reduce weight and remove the need for urea storage and handling.

The main consideration is that the engine and wider power system still need to be properly specified, integrated and supported. No-urea technology simplifies emissions management, but it does not remove the need for good engineering, commissioning and lifecycle maintenance.

A no-urea marine engine can simplify maintenance because there is no urea-based SCR system to manage.

Operators do not need to maintain urea dosing equipment, manage urea storage or deal with SCR-related consumables. However, the engine still requires correct servicing, monitoring and planned maintenance to perform reliably.